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cleartomark
%%EndFont 
%%BeginFont: CMBX12
%!PS-AdobeFont-1.1: CMBX12 1.0
%%CreationDate: 1991 Aug 20 16:34:54
% Copyright (C) 1997 American Mathematical Society. All Rights Reserved.
11 dict begin
/FontInfo 7 dict dup begin
/version (1.0) readonly def
/Notice (Copyright (C) 1997 American Mathematical Society. All Rights Reserved) readonly def
/FullName (CMBX12) readonly def
/FamilyName (Computer Modern) readonly def
/Weight (Bold) readonly def
/ItalicAngle 0 def
/isFixedPitch false def
end readonly def
/FontName /CMBX12 def
/PaintType 0 def
/FontType 1 def
/FontMatrix [0.001 0 0 0.001 0 0] readonly def
/Encoding 256 array
0 1 255 {1 index exch /.notdef put} for
dup 12 /fi put
dup 44 /comma put
dup 45 /hyphen put
dup 46 /period put
dup 48 /zero put
dup 49 /one put
dup 50 /two put
dup 51 /three put
dup 52 /four put
dup 53 /five put
dup 54 /six put
dup 55 /seven put
dup 56 /eight put
dup 57 /nine put
dup 65 /A put
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dup 67 /C put
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dup 122 /z put
readonly def
/FontBBox{-53 -251 1139 750}readonly def
currentdict end
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cleartomark
%%EndFont 
%%BeginFont: CMBX10
%!PS-AdobeFont-1.1: CMBX10 1.00B
%%CreationDate: 1992 Feb 19 19:54:06
% Copyright (C) 1997 American Mathematical Society. All Rights Reserved.
11 dict begin
/FontInfo 7 dict dup begin
/version (1.00B) readonly def
/Notice (Copyright (C) 1997 American Mathematical Society. All Rights Reserved) readonly def
/FullName (CMBX10) readonly def
/FamilyName (Computer Modern) readonly def
/Weight (Bold) readonly def
/ItalicAngle 0 def
/isFixedPitch false def
end readonly def
/FontName /CMBX10 def
/PaintType 0 def
/FontType 1 def
/FontMatrix [0.001 0 0 0.001 0 0] readonly def
/Encoding 256 array
0 1 255 {1 index exch /.notdef put} for
dup 12 /fi put
dup 46 /period put
dup 49 /one put
dup 50 /two put
dup 65 /A put
dup 67 /C put
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dup 77 /M put
dup 80 /P put
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dup 97 /a put
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dup 110 /n put
dup 111 /o put
dup 112 /p put
dup 114 /r put
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dup 116 /t put
dup 117 /u put
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dup 120 /x put
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readonly def
/FontBBox{-301 -250 1164 946}readonly def
currentdict end
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cleartomark
%%EndFont 
%%BeginFont: CMR9
%!PS-AdobeFont-1.1: CMR9 1.0
%%CreationDate: 1991 Aug 20 16:39:59
% Copyright (C) 1997 American Mathematical Society. All Rights Reserved.
11 dict begin
/FontInfo 7 dict dup begin
/version (1.0) readonly def
/Notice (Copyright (C) 1997 American Mathematical Society. All Rights Reserved) readonly def
/FullName (CMR9) readonly def
/FamilyName (Computer Modern) readonly def
/Weight (Medium) readonly def
/ItalicAngle 0 def
/isFixedPitch false def
end readonly def
/FontName /CMR9 def
/PaintType 0 def
/FontType 1 def
/FontMatrix [0.001 0 0 0.001 0 0] readonly def
/Encoding 256 array
0 1 255 {1 index exch /.notdef put} for
dup 12 /fi put
dup 44 /comma put
dup 46 /period put
dup 73 /I put
dup 80 /P put
dup 84 /T put
dup 87 /W put
dup 88 /X put
dup 97 /a put
dup 98 /b put
dup 99 /c put
dup 100 /d put
dup 101 /e put
dup 102 /f put
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dup 104 /h put
dup 105 /i put
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dup 108 /l put
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dup 110 /n put
dup 111 /o put
dup 112 /p put
dup 114 /r put
dup 115 /s put
dup 116 /t put
dup 117 /u put
dup 119 /w put
dup 121 /y put
dup 122 /z put
readonly def
/FontBBox{-39 -250 1036 750}readonly def
currentdict end
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/ItalicAngle 0 def
/isFixedPitch false def
end readonly def
/FontName /CMR12 def
/PaintType 0 def
/FontType 1 def
/FontMatrix [0.001 0 0 0.001 0 0] readonly def
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dup 44 /comma put
dup 46 /period put
dup 48 /zero put
dup 49 /one put
dup 54 /six put
dup 57 /nine put
dup 67 /C put
dup 68 /D put
dup 73 /I put
dup 77 /M put
dup 80 /P put
dup 87 /W put
dup 88 /X put
dup 97 /a put
dup 99 /c put
dup 100 /d put
dup 103 /g put
dup 105 /i put
dup 109 /m put
dup 110 /n put
dup 111 /o put
dup 114 /r put
dup 115 /s put
dup 116 /t put
dup 117 /u put
dup 118 /v put
dup 121 /y put
readonly def
/FontBBox{-34 -251 988 750}readonly def
currentdict end
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cleartomark
%%EndFont 
%%BeginFont: CMR17
%!PS-AdobeFont-1.1: CMR17 1.0
%%CreationDate: 1991 Aug 20 16:38:24
% Copyright (C) 1997 American Mathematical Society. All Rights Reserved.
11 dict begin
/FontInfo 7 dict dup begin
/version (1.0) readonly def
/Notice (Copyright (C) 1997 American Mathematical Society. All Rights Reserved) readonly def
/FullName (CMR17) readonly def
/FamilyName (Computer Modern) readonly def
/Weight (Medium) readonly def
/ItalicAngle 0 def
/isFixedPitch false def
end readonly def
/FontName /CMR17 def
/PaintType 0 def
/FontType 1 def
/FontMatrix [0.001 0 0 0.001 0 0] readonly def
/Encoding 256 array
0 1 255 {1 index exch /.notdef put} for
dup 50 /two put
dup 65 /A put
dup 67 /C put
dup 68 /D put
dup 80 /P put
dup 83 /S put
dup 86 /V put
dup 88 /X put
dup 97 /a put
dup 99 /c put
dup 101 /e put
dup 102 /f put
dup 104 /h put
dup 105 /i put
dup 108 /l put
dup 110 /n put
dup 111 /o put
dup 114 /r put
dup 115 /s put
dup 116 /t put
dup 117 /u put
dup 121 /y put
readonly def
/FontBBox{-33 -250 945 749}readonly def
currentdict end
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(really)e(w)n(ere)g(the)h(mimic)n(k)n(ed)g(clien)n(t.)731
2595 y(A)f(wide)h(v)-5 b(ariet)n(y)26 b(of)h(requests)f(ma)n(y)h(b)r(e)
h(used)f(in)g(a)g(sp)r(o)r(o\014ng)g(attac)n(k;)f(w)n(e)h(will)h(only)
731 2694 y(p)r(oin)n(t)f(out)h(a)f(few)h(lik)n(ely)f(candidates.)523
2858 y Fc(Destruction)42 b Ff(o)r(ccurs)26 b(when)i(a)f(clien)n(t)h
(causes)e(another)h(clien)n(t)h(to)f(lose)g(information)g(in)731
2957 y(a)37 b(w)n(a)n(y)f(that)h(the)h(clien)n(t)g(or)e(user)h(is)g
(lik)n(ely)g(to)g(notice.)67 b(\(This)37 b(do)r(es)g(not)h(coun)n(t)731
3057 y(exp)r(ected)28 b(forms)f(of)g(destruction,)g(e.g.,)h(exp)r
(osures.\))523 3221 y Fc(Alteration)41 b Ff(o)r(ccurs)26
b(when)h(a)g(clien)n(t)g(causes)f(another)g(clien)n(t)h(to)f(lose)g
(information)h(in)g(a)731 3320 y(w)n(a)n(y)i(that)h(the)h(clien)n(t)g
(or)e(user)h(is)g(unlik)n(ely)g(to)g(notice.)46 b(e.g.,)30
b(c)n(hanging)f(one)h(pixel)731 3420 y(in)d(a)h(dra)n(w)n(able.)523
3646 y(The)35 b(line)f(b)r(et)n(w)n(een)h(alteration)e(and)h
(destruction)h(is)f(sub)5 b(jectiv)n(e.)57 b(Securit)n(y)34
b(literature)523 3746 y(do)r(es)d(often)g(distinguish)g(b)r(et)n(w)n
(een)g(them,)i(though)e(not)g(alw)n(a)n(ys)e(explicitly)-7
b(.)48 b(Alteration)523 3845 y(is)30 b(often)g(considered)e(more)h
(insidious)h(b)r(ecause)f(its)h(e\013ects)g(ma)n(y)f(not)h(b)r(e)g
(realized)f(un)n(til)523 3945 y(long)g(after)h(it)h(has)e(o)r(ccurred.)
43 b(In)31 b(the)f(in)n(terv)n(ening)f(time,)i(eac)n(h)e(time)i(the)f
(altered)g(data)523 4044 y(is)e(used,)f(it)h(can)f(cause)g(more)g
(damage.)523 4368 y Fd(2)135 b(General)45 b(securit)l(y)h(concerns)e
(and)h(remedies)523 4599 y Ff(The)28 b(follo)n(wing)f(sections)g
(discuss)g(securit)n(y)g(problems)g(in)n(trinsic)h(to)g(the)g(X)g
(Proto)r(col.)36 b(A)523 4699 y(statemen)n(t)i(of)g(eac)n(h)f(problem)g
(is)h(usually)f(follo)n(w)n(ed)g(b)n(y)h(p)r(oten)n(tial)g(remedies.)67
b(A)38 b(few)523 4799 y(w)n(ords)29 b(here)g(ab)r(out)i(p)r(ossible)e
(remedies)h(will)g(help)h(frame)e(the)i(sp)r(eci\014c)f(ones)g(describ)
r(ed)523 4898 y(b)r(elo)n(w.)1934 5147 y(3)p eop end
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TeXDict begin 4 3 bop 523 614 a Ff(If)37 b(a)g(clien)n(t)g(attempts)h
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(one)h(of)g(the)523 714 y(follo)n(wing)27 b(actions,)f(listed)i
(roughly)f(in)h(order)e(of)h(sev)n(erit)n(y:)523 863
y(1.)42 b(Execute)29 b(the)h(request)f(normally)-7 b(.)41
b(This)29 b(is)h(the)g(righ)n(t)e(c)n(hoice)h(when)g(w)n(e)h(decide)f
(that)523 963 y(a)e(particlar)f(threat)i(is)f(not)h(serious)e(enough)h
(to)g(w)n(orry)f(ab)r(out.)523 1112 y(2.)45 b(Execute)30
b(the)h(request)f(in)h(some)f(mo)r(di\014ed)h(form,)g(e.g.,)g
(substitute)g(di\013eren)n(t)g(v)-5 b(alues)523 1212
y(for)27 b(some)g(of)h(the)g(request)f(\014elds,)g(or)g(edit)h(the)g
(reply)-7 b(.)523 1362 y(3.)44 b(Arrange)28 b(to)i(ask)g(the)g(user)f
(what)h(to)g(do,)h(giv)n(en)e(some)g(subset)i(of)f(the)g(other)f(c)n
(hoices)523 1461 y(in)f(this)g(list.)37 b(This)27 b(m)n(ust)h(b)r(e)g
(used)g(sparingly)e(b)r(ecause)h(of)h(the)g(p)r(erformance)e(impact.)
523 1611 y(4.)47 b(T)-7 b(reat)30 b(the)i(request)e(as)g(a)h(no-op.)46
b(If)32 b(the)f(clien)n(t)g(will)h(probably)d(not)i(notice,)h(or)e(if)i
(it)523 1710 y(seems)27 b(lik)n(ely)g(that)h(the)g(in)n(ten)n(t)g(w)n
(as)f(b)r(enign,)g(this)h(is)g(a)f(go)r(o)r(d)g(c)n(hoice.)523
1860 y(5.)41 b(Send)29 b(a)g(proto)r(col)f(error)f(to)i(the)h(clien)n
(t.)41 b(If)30 b(the)f(clien)n(t)g(will)h(b)r(e)f(confused)g(enough)g
(b)n(y)523 1959 y(the)g(other)f(options)g(that)h(it)f(will)h(probably)e
(crash)h(or)f(b)r(ecome)i(useless)f(an)n(yw)n(a)n(y)-7
b(,)26 b(or)i(if)h(it)523 2059 y(seems)e(lik)n(ely)g(that)h(the)g(in)n
(ten)n(t)g(w)n(as)f(malicious,)f(this)i(is)g(a)f(go)r(o)r(d)g(c)n
(hoice.)523 2208 y(6.)44 b(Kill)29 b(the)i(clien)n(t.)44
b(This)30 b(migh)n(t)g(b)r(e)g(the)g(righ)n(t)f(action)h(if)g(there)g
(is)g(no)g(doubt)g(that)g(the)523 2308 y(clien)n(t)e(is)f(hostile.)523
2457 y(In)d(most)f(cases)f(w)n(e)h(presen)n(t)g(the)h(one)f(option)g
(that)g(seems)g(most)g(appropriate)f(to)h(coun)n(ter)523
2557 y(the)f(threat,)g(taking)f(in)n(to)g(accoun)n(t)g(the)h
(seriousness)e(of)h(the)h(threat,)g(the)g(implemen)n(tation)523
2657 y(di\016cult)n(y)-7 b(,)30 b(and)e(the)h(impact)g(on)f
(applications.)40 b(Our)28 b(initial)h(bias)f(is)h(to)f(err)g(on)g(the)
h(side)523 2756 y(of)e(stronger)e(securit)n(y)-7 b(,)26
b(with)h(the)g(accompan)n(ying)e(tigh)n(ter)h(restrictions.)35
b(As)27 b(w)n(e)f(unco)n(v)n(er)523 2856 y(imp)r(ortan)n(t)i(op)r
(erations)f(and)i(applications)e(that)i(the)g(new)g(restrictions)e(in)n
(terfere)h(with,)523 2956 y(w)n(e)f(can)g(apply)h(selectiv)n(e)f(lo)r
(osening)f(to)i(allo)n(w)e(the)i(desired)f(functionalit)n(y)-7
b(.)523 3105 y(In)32 b(some)f(cases)f(w)n(e)i(will)g(suggest)e
(returning)h(an)h(Access)f(error)e(where)j(the)g(X)g(proto)r(col)523
3205 y(do)r(es)d(not)h(explicitly)f(allo)n(w)g(one.)42
b(These)29 b(new)h(Access)f(errors)e(arise)h(when)i(a)f(clien)n(t)h
(can)523 3304 y(only)23 b(p)r(erform)g(a)g(\(non-empt)n(y\))h(subset)f
(of)h(the)f(de\014ned)h(op)r(erations)e(on)i(a)f(resource.)33
b(The)523 3404 y(disallo)n(w)n(ed)f(op)r(erations)h(cause)f(Access)i
(errors.)53 b(The)33 b(resiource)f(at)i(issue)f(is)h(usually)f(a)523
3504 y(ro)r(ot)27 b(windo)n(w.)523 3786 y Fb(2.1)112
b(Access)38 b(to)e(Serv)m(er)i(Resources)523 3989 y Ff(The)e(X)h(proto)
r(col)d(allo)n(ws)h(clien)n(ts)h(to)g(manipulate)g(resources)e(\(ob)5
b(jects\))36 b(b)r(elonging)g(to)523 4088 y(other)23
b(clien)n(ts)h(or)f(to)h(the)g(serv)n(er.)34 b(An)n(y)24
b(request)f(that)h(sp)r(eci\014es)g(a)f(resource)f(ID)i(is)g(vulner-)
523 4188 y(able)i(to)g(some)f(of)h(the)h(ab)r(o)n(v)n(e)d(threats.)36
b(Suc)n(h)26 b(requests)g(also)f(pro)n(vide)g(a)g(w)n(a)n(y)g(for)h(a)f
(clien)n(t)523 4288 y(to)31 b(guess)f(resource)e(IDs)j(of)g(other)f
(clien)n(ts.)46 b(A)32 b(clien)n(t)e(can)h(mak)n(e)f(educated)g
(guesses)g(for)523 4387 y(p)r(ossible)c(resource)f(IDs,)i(and)f(if)h
(the)g(request)f(succeeds,)h(it)g(kno)n(ws)e(it)i(has)f(determined)h(a)
523 4487 y(v)-5 b(alid)28 b(resource)d(ID.)k(W)-7 b(e)28
b(call)f(this)h(\\resource)d(ID)j(guessing")e(in)i(the)g(list)g(b)r
(elo)n(w.)523 4636 y(One)h(lik)n(ely)g(defense)h(against)e(these)i
(problems)f(is)g(to)h(ha)n(v)n(e)e(the)i(serv)n(er)e(send)i(an)f
(appro-)523 4736 y(priate)f(proto)r(col)f(error)f(to)i(den)n(y)g(the)h
(existence)f(of)g(an)n(y)g(resource)e(sp)r(eci\014ed)i(b)n(y)g(a)g
(clien)n(t)523 4836 y(that)k(do)r(esn't)g(b)r(elong)f(to)g(that)h
(clien)n(t.)49 b(A)32 b(v)-5 b(ariation)30 b(on)i(this)g(p)r(olicy)f
(lets)h(co)r(op)r(erating)1934 5147 y(4)p eop end
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TeXDict begin 5 4 bop 523 614 a Ff(groups)32 b(of)h(clien)n(ts)g
(access)f(eac)n(h)g(other's)h(resources,)f(but)i(not)f(those)g(of)g
(other)g(groups.)523 714 y(The)22 b(Broadw)n(a)n(y)d(pro)5
b(ject)22 b(will)g(initially)g(use)g(a)g(less)f(general)g(form)h(of)g
(this)g(idea)g(b)n(y)f(ha)n(ving)523 814 y(t)n(w)n(o)33
b(groups,)g(trusted)h(and)f(un)n(trusted.)54 b(T)-7 b(rusted)34
b(clien)n(ts)f(can)g(do)g(ev)n(erything)f(that)i(X)523
913 y(clien)n(ts)27 b(can)f(do)h(to)r(da)n(y)-7 b(.)36
b(They)26 b(will)h(b)r(e)h(protected)e(from)h(un)n(trusted)f(clien)n
(ts)h(in)g(w)n(a)n(ys)f(de-)523 1013 y(scrib)r(ed)e(b)r(elo)n(w.)35
b(Un)n(trusted)24 b(clien)n(ts)f(will)h(not)g(b)r(e)g(protected)g(from)
f(eac)n(h)g(other.)35 b(Though)523 1112 y(this)c(will)g(b)r(e)g(the)g
(initial)g(design,)g(w)n(e)g(need)f(to)h(mak)n(e)f(sure)g(there)g(is)h
(a)f(gro)n(wth)g(path)h(to)523 1212 y(m)n(ultiple)d(\(more)f(than)h(t)n
(w)n(o\))f(groups.)523 1362 y(Most)35 b(of)g(the)h(time,)i
(applications)d(nev)n(er)f(access)g(serv)n(er)g(resources)f(that)j
(aren't)e(their)523 1461 y(o)n(wn,)d(so)e(the)i(impact)g(of)f(disallo)n
(wing)f(suc)n(h)h(accesses)f(should)h(b)r(e)h(minimal.)45
b(There)30 b(are)523 1561 y(a)35 b(few)g(notable)g(exceptions,)h(most)f
(of)g(whic)n(h)g(will)h(b)r(e)f(discussed)g(under)g(the)g(relev)-5
b(an)n(t)523 1660 y(proto)r(col)30 b(requests.)48 b(They)31
b(are:)44 b(ICCCM)32 b(selection)f(transfer,)g(Motif)h(drag)f(and)g
(drop,)523 1760 y(and)23 b(serv)n(er-global)c(resources)i(lik)n(e)h
(the)i(ro)r(ot)e(windo)n(w)g(and)h(default)g(colormap.)34
b(Another)523 1860 y(ma)5 b(jor)26 b(exception)h(is)g(the)h(windo)n(w)f
(manager,)f(whic)n(h)h(routinely)g(manipulates)g(windo)n(ws)523
1959 y(of)f(other)g(applications.)36 b(The)27 b(solution)f(for)g(windo)
n(w)g(managers)e(is)j(to)f(alw)n(a)n(ys)e(run)j(them)523
2059 y(as)g(trusted)h(applications.)523 2208 y(The)43
b(implemen)n(tation)g(di\016cult)n(y)g(of)g(limiting)g(access)e(to)i
(resources)e(should)h(not)h(b)r(e)523 2308 y(large.)70
b(All)40 b(resource)e(accesses)f(ev)n(en)n(tually)i(funnel)h(do)n(wn)e
(to)i(one)e(of)i(t)n(w)n(o)e(functions)523 2408 y(in)29
b(dix/resource.c:)35 b(Lo)r(okupIDByT)n(yp)r(e\(\))28
b(and)g(Lo)r(okupIDByClass\(\).)38 b(A)29 b(few)f(lines)g(of)523
2507 y(c)n(hec)n(king)c(at)h(the)h(top)f(of)h(these)f(functions)h(will)
f(form)g(the)h(heart)f(of)g(this)h(defense.)36 b(There)523
2607 y(is)f(a)f(small)h(problem)f(b)r(ecause)g(these)h(functions)g(are)
f(not)h(told)g(whic)n(h)f(clien)n(t)h(is)g(doing)523
2707 y(the)28 b(lo)r(okup,)f(but)h(that)g(can)f(b)r(e)h(solv)n(ed)e
(either)i(b)n(y)f(adding)g(a)g(clien)n(t)h(parameter)e(\(proba-)523
2806 y(bly)k(as)g(a)g(new)g(function)g(to)g(preserv)n(e)f(compatibilit)
n(y\),)i(or)e(b)n(y)h(using)g(the)g(serv)n(er)f(global)523
2906 y(requestingClien)n(t.)523 3055 y(ISSUE:)24 b(are)e(w)n(e)h
(really)g(going)f(to)i(b)r(e)g(able)f(to)g(get)h(a)n(w)n(a)n(y)d(with)j
(hiding)g(trusted)f(resources,)523 3155 y(or)30 b(will)h(things)g(lik)n
(e)f(Motif)h(drag)f(and)h(drop)f(force)g(us)h(to)f(exp)r(ose)h(them?)47
b(\(Either)30 b(w)n(a)n(y)-7 b(,)523 3254 y(the)34 b(op)r(erations)e
(that)i(un)n(trusted)f(clien)n(ts)g(can)g(do)g(to)h(trusted)f
(resources)f(will)h(ha)n(v)n(e)g(to)523 3354 y(b)r(e)h(limited.\))57
b(Is)34 b(there)g(something)f(in)i(Xt)f(or)f(the)i(ICCCM)f(that)g
(breaks)e(if)j(y)n(ou)e(hide)523 3454 y(resources?)523
3736 y Fb(2.2)112 b(Denial)39 b(of)e(Service)523 3939
y Fc(2.2.1)94 b(Memory)31 b(Exhaustion)523 4142 y Ff(An)n(y)25
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(suc)n(h)f(requests)g(rep)r(eat-)523 4341 y(edly)31 b(un)n(til)g(the)g
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b(that)g(happ)r(ens,)h(the)f(serv)n(er)e(will)523 4441
y(either)d(crash)e(or)h(b)r(e)h(forced)f(to)h(send)g(Allo)r(c)g
(errors.)34 b(The)25 b(most)h(ob)n(vious)e(candidates)h(are)523
4541 y(resource)31 b(creation)h(requests,)h(e.g.,)h(CreatePixmap,)e
(but)h(in)g(realit)n(y)f(a)h(large)e(p)r(ercen)n(t-)523
4640 y(age)26 b(of)i(requests)e(cause)h(memory)f(allo)r(cation,)h(if)h
(only)f(temp)r(orarily)-7 b(,)26 b(dep)r(ending)i(on)f(the)523
4740 y(serv)n(er)e(implemen)n(tation.)36 b(F)-7 b(or)26
b(this)h(reason,)e(the)i(list)f(of)h(requests)e(sub)5
b(ject)27 b(to)f(this)h(form)523 4839 y(of)h(denial)f(of)h(service)e
(will)i(b)r(e)g(necessarily)e(incomplete.)1934 5147 y(5)p
eop end
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(er-clien)n(t)f(quotas)523 714 y(on)g(memory)g(consumption.)38
b(When)29 b(the)g(limit)g(is)f(surpassed,)g(the)g(serv)n(er)f(could)h
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523 913 y(within)28 b(quota.)37 b(The)27 b(implemen)n(tation)h
(di\016cult)n(y)g(is)f(another)g(story)-7 b(.)523 1063
y(Conceptually)g(,)31 b(it)h(seems)e(easy:)42 b(simply)31
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n(ery)523 1162 y(memory)26 b(\(de\)allo)r(cation)g(op)r(eration,)g(up)r
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1262 y(an)35 b(error)f(if)i(the)g(clien)n(t)f(is)g(o)n(v)n(er)f(the)i
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523 1362 y(already)f(touc)n(hed)h(on:)53 b(the)36 b(allo)r(cator)e
(functions)i(aren't)f(told)g(whic)n(h)h(clien)n(t)g(the)f(allo-)523
1461 y(cation)e(b)r(elongs)g(to.)55 b(Unlik)n(e)34 b(resource)e(lo)r
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1561 y(places)j(to)g(consider)g(a)g(new)h(in)n(terface)e(that)i(passes)
f(the)h(clien)n(t,)i(so)c(using)i(the)g(global)523 1660
y(requestingClien)n(t)27 b(is)g(practically)g(mandatory)-7
b(.)523 1810 y(The)42 b(problems)g(run)g(deep)r(er.)81
b(The)42 b(logical)f(thing)h(for)g(the)h(allo)r(cator)d(to)i(do)g(if)h
(the)523 1910 y(clien)n(t)c(is)f(o)n(v)n(er)f(its)i(limit)g(is)g(to)f
(return)h(NULL,)g(indicating)f(allo)r(cation)g(failure.)69
b(Un-)523 2009 y(fortunately)-7 b(,)40 b(there)d(are)g(man)n(y)g
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e(not)g(all,)i(are)d(\\protected")f(b)n(y)h(setting)h(the)523
2208 y(global)25 b(v)-5 b(ariable)26 b(Must)p 1269 2208
25 4 v 30 w(ha)n(v)n(e)p 1464 2208 V 29 w(memory)f(to)i(T)-7
b(rue)26 b(around)f(the)i(delicate)f(co)r(de.)37 b(W)-7
b(e)27 b(could)523 2308 y(help)c(the)g(problem)f(b)n(y)h(skipping)f
(the)h(limit)h(c)n(hec)n(k)e(if)h(Must)p 2404 2308 V
30 w(ha)n(v)n(e)p 2599 2308 V 29 w(memory)f(is)g(T)-7
b(rue.)35 b(The)523 2408 y(b)r(est)26 b(solution)f(w)n(ould)g(b)r(e)g
(to)h(bullet-pro)r(of)f(the)g(serv)n(er)f(against)g(allo)r(cation)h
(failures,)g(but)523 2507 y(that)34 b(is)f(b)r(ey)n(ond)g(the)h(scop)r
(e)f(of)g(Broadw)n(a)n(y)-7 b(.)52 b(Another)33 b(consideration)f(is)h
(that)h(the)g(ad-)523 2607 y(ditional)29 b(c)n(hec)n(king)f(ma)n(y)g
(ha)n(v)n(e)g(a)h(measurable)f(p)r(erformance)g(impact,)i(since)f(the)g
(serv)n(er)523 2707 y(do)r(es)e(frequen)n(t)h(allo)r(cations.)523
2856 y(A)38 b(third)f(problem)g(is)g(that)h(there)f(is)g(no)g(p)r
(ortable)f(w)n(a)n(y)g(to)i(determine)f(the)h(size)f(of)g(a)523
2956 y(c)n(h)n(unk)25 b(of)g(allo)r(cated)f(memory)h(giv)n(en)f(just)i
(a)e(p)r(oin)n(ter)h(to)g(the)h(c)n(h)n(unk,)f(and)g(that's)g(all)g(y)n
(ou)523 3055 y(ha)n(v)n(e)k(inside)h(Xreallo)r(c\(\))g(and)g
(Xfree\(\).)45 b(The)30 b(serv)n(er)e(could)i(comp)r(ensate)f(b)n(y)h
(recording)523 3155 y(the)38 b(sizes)f(itself)h(somewhere,)h(but)g
(that)f(w)n(ould)f(b)r(e)h(w)n(asteful)f(of)h(memory)-7
b(,)40 b(since)d(the)523 3254 y(mallo)r(c)i(implemen)n(tation)h(also)f
(m)n(ust)h(b)r(e)g(recording)e(blo)r(c)n(k)i(sizes.)73
b(On)39 b(top)h(of)g(that,)523 3354 y(the)32 b(redundan)n(t)f(b)r(o)r
(okk)n(eeping)g(w)n(ould)g(h)n(urt)h(p)r(erformance.)48
b(One)31 b(solution)g(is)h(to)f(use)h(a)523 3454 y(custom)37
b(mallo)r(c)g(that)g(has)g(the)h(needed)f(supp)r(ort,)i(but)f(that)g
(to)r(o)e(seems)h(b)r(ey)n(ond)g(the)523 3553 y(scop)r(e)27
b(of)h(Broadw)n(a)n(y)-7 b(.)523 3703 y(Considering)35
b(all)i(of)f(this,)j(w)n(e)e(think)g(it)g(is)f(advisable)g(to)g(defer)h
(solving)e(the)i(memory)523 3802 y(exhaustion)25 b(problem)g(to)h(a)f
(future)h(release.)35 b(Keep)25 b(this)h(in)g(mind)g(when)g(y)n(ou)f
(see)g(quotas)523 3902 y(men)n(tioned)j(as)f(a)g(defense)g(in)h(the)g
(list)g(b)r(elo)n(w.)523 4168 y Fc(2.2.2)94 b(CPU)32
b(Monop)s(olization)523 4371 y Ff(Another)19 b(general)g(w)n(a)n(y)f
(that)i(a)f(clien)n(t)h(can)f(cause)f(denial)i(of)f(service)g(is)g(to)h
(\015o)r(o)r(d)f(the)h(serv)n(er)523 4470 y(with)36 b(requests.)60
b(The)35 b(serv)n(er)f(will)i(sp)r(end)g(a)f(large)f(p)r(ercen)n(tage)g
(of)i(its)g(time)g(servicing)523 4570 y(those)18 b(requests,)h(p)r
(ossibly)f(starving)g(other)f(clien)n(ts)i(and)f(certainly)f(h)n
(urting)h(p)r(erformance.)523 4670 y(Ev)n(ery)32 b(request)h(can)h(b)r
(e)g(used)g(for)f(\015o)r(o)r(ding,)i(so)e(w)n(e)h(will)g(not)f(b)r
(other)h(to)g(list)g(\015o)r(o)r(ding)523 4769 y(on)i(ev)n(ery)e
(request.)61 b(A)36 b(v)-5 b(ariation)35 b(on)g(this)h(attac)n(k)f(is)h
(to)f(\015o)r(o)r(d)h(the)g(serv)n(er)e(with)i(new)523
4869 y(connection)27 b(attempts.)1934 5147 y(6)p eop
end
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TeXDict begin 7 6 bop 523 614 a Ff(T)-7 b(o)20 b(reduce)f(the)h
(e\013ectiv)n(eness)g(of)g(\015o)r(o)r(ding,)h(the)f(serv)n(er)e(could)
i(use)f(a)h(di\013eren)n(t)g(sc)n(heduling)523 714 y(algorithm)35
b(that)i(throttles)f(clien)n(ts)g(that)h(are)e(monop)r(olizing)h(the)h
(serv)n(er,)f(or)g(it)h(could)523 814 y(simply)c(fa)n(v)n(or)f(trusted)
h(clien)n(ts)g(o)n(v)n(er)e(un)n(trusted)i(ones.)53 b(Applications)33
b(cannot)g(dep)r(end)523 913 y(on)g(a)f(particular)g(sc)n(heduling)g
(algorithm)g(an)n(yw)n(a)n(y)-7 b(,)32 b(so)h(c)n(hanging)e(it)j
(should)e(not)h(a\013ect)523 1013 y(them.)66 b(The)37
b(Sync)n(hronization)e(extension)i(sp)r(eci\014es)f(a)h(w)n(a)n(y)f(to)
g(set)h(clien)n(t)g(priorities,)523 1112 y(and)24 b(a)h(simple)f
(priorit)n(y)f(sc)n(heduler)h(already)f(exists)h(in)h(the)g(serv)n(er)e
(to)h(supp)r(ort)h(it,)g(so)f(this)523 1212 y(should)j(b)r(e)h(simple)g
(to)g(add.)523 1536 y Fd(3)135 b(Securit)l(y)30 b(concerns)g(with)g(sp)
t(eci\014c)f(windo)l(w)i(attributes)523 1785 y Fb(3.1)112
b(Bac)m(kground-pixmap)523 1988 y Ff(Clien)n(ts)38 b(can)g(use)h(windo)
n(ws)e(with)i(the)g(bac)n(kground-pixmap)d(attribute)j(set)f(to)g(None)
523 2087 y(\(hereafter)28 b(\\bac)n(kground)e(none)j(windo)n(ws"\))f
(to)g(obtain)h(images)f(of)g(other)g(windo)n(ws.)40 b(A)523
2187 y(bac)n(kground)32 b(none)i(windo)n(w)g(nev)n(er)g(pain)n(ts)g
(its)g(o)n(wn)g(bac)n(kground,)g(so)g(whatev)n(er)f(hap-)523
2287 y(p)r(ened)38 b(to)g(b)r(e)g(on)g(the)g(screen)f(when)h(the)h
(windo)n(w)e(w)n(as)g(mapp)r(ed)h(can)f(b)r(e)i(read)e(from)523
2386 y(the)26 b(bac)n(kground)e(none)i(windo)n(w)f(with)i(GetImage.)35
b(This)26 b(ma)n(y)f(w)n(ell)h(con)n(tain)f(data)h(from)523
2486 y(other)21 b(windo)n(ws.)34 b(The)21 b(CreateWindo)n(w)g(and)g
(ChangeWindo)n(wA)n(ttributes)f(requests)h(can)523 2586
y(set)j(the)g(bac)n(kground-pixmap)d(attribute)j(set)f(to)h(None,)g
(and)g(man)n(y)f(windo)n(w)g(op)r(erations)523 2685 y(can)34
b(cause)f(data)h(from)f(other)h(windo)n(ws)f(to)h(b)r(e)g(left)h(in)f
(a)g(bac)n(kground)e(none)i(windo)n(w,)523 2785 y(including)21
b(Reparen)n(tWindo)n(w,)g(MapWindo)n(w,)h(MapSub)n(windo)n(ws,)g
(Con\014gureWindo)n(w,)523 2884 y(and)27 b(CirculateWindo)n(w.)523
3034 y(Bac)n(kground)33 b(none)j(windo)n(ws)f(can)g(also)g(b)r(e)h
(used)f(to)h(cause)f(apparen)n(t)f(alteration.)60 b(A)523
3134 y(clien)n(t)27 b(can)g(create)f(a)h(windo)n(w)g(with)g(bac)n
(kground)f(none)g(and)h(dra)n(w)f(to)h(it.)38 b(The)27
b(dra)n(wing)523 3233 y(will)21 b(app)r(ear)e(to)i(the)g(user)f(to)g(b)
r(e)h(in)g(the)g(windo)n(ws)f(b)r(elo)n(w)g(the)h(bac)n(kground)e(none)
h(windo)n(w.)523 3383 y(T)-7 b(o)19 b(remedy)g(these)h(problems,)g(the)
g(serv)n(er)e(could)h(substitute)h(a)f(w)n(ell-de\014ned)g(bac)n
(kground)523 3482 y(when)36 b(a)f(clien)n(t)g(sp)r(eci\014es)h(None.)60
b(Ideally)35 b(the)h(substituted)h(bac)n(kground)c(w)n(ould)i(lo)r(ok)
523 3582 y(di\013eren)n(t)h(enough)g(from)g(other)g(windo)n(ws)f(that)i
(the)g(user)e(w)n(ouldn't)i(b)r(e)f(confused.)63 b(A)523
3681 y(tile)30 b(depicting)g(some)g(appropriate)e(in)n(ternational)h
(sym)n(b)r(ol)g(migh)n(t)h(b)r(e)g(reasonable.)42 b(W)-7
b(e)523 3781 y(b)r(eliev)n(e)32 b(that)h(there)f(are)g(few)h
(applications)e(that)i(actually)f(rely)g(on)g(bac)n(kground)f(none)523
3881 y(seman)n(tics,)25 b(and)h(those)f(that)h(do)g(will)f(b)r(e)h
(easy)f(for)g(the)h(user)f(to)h(iden)n(tify)g(b)r(ecause)f(of)h(the)523
3980 y(distinctiv)n(e)33 b(tile.)54 b(Implemen)n(tation)33
b(should)g(not)g(b)r(e)g(a)g(problem)g(either.)53 b(Luc)n(kily)-7
b(,)34 b(the)523 4080 y(windo)n(w)f(bac)n(kground)e(cannot)i(b)r(e)g
(retriev)n(ed)f(through)h(the)g(X)h(proto)r(col,)f(so)g(w)n(e)g(w)n
(on't)523 4180 y(ha)n(v)n(e)26 b(to)i(main)n(tain)f(an)n(y)g(illusions)
g(ab)r(out)h(its)f(v)-5 b(alue.)523 4329 y(ISSUE:)24
b(Some)f(v)n(endors)g(ha)n(v)n(e)f(extensions)h(to)h(let)g(y)n(ou)f
(query)g(the)h(windo)n(w)f(bac)n(kground.)523 4429 y(Do)28
b(w)n(e)f(need)h(to)f(accomo)r(date)f(that?)523 4578
y(ISSUE:)k(Will)h(this)g(lead)f(to)g(unacceptable)g(application)f
(break)-5 b(age?)43 b(Could)31 b(the)f(serv)n(er)523
4678 y(b)r(e)j(smarter,)f(only)g(pain)n(ting)f(with)i(the)g(w)n
(ell-de\014ned)f(bac)n(kground)e(when)i(the)h(windo)n(w)523
4777 y(actually)27 b(con)n(tains)g(bits)h(from)f(trusted)g(windo)n(ws?)
1934 5147 y(7)p eop end
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TeXDict begin 8 7 bop 523 614 a Fb(3.2)112 b(P)m(aren)m(tRelativ)m(e)38
b(and)g(Cop)m(yF)-9 b(romP)m(aren)m(t)523 817 y Ff(Sev)n(eral)28
b(windo)n(w)h(attributes)g(can)g(tak)n(e)f(on)h(sp)r(ecial)g(v)-5
b(alues)29 b(that)h(cause)e(them)i(to)f(refer-)523 917
y(ence)i(\(P)n(aren)n(tRelativ)n(e\))e(or)g(cop)n(y)h(\(Cop)n(yF)-7
b(romP)n(aren)n(t\))28 b(the)k(same)e(attribute)h(from)f(the)523
1017 y(windo)n(w's)i(paren)n(t.)51 b(This)32 b(\014ts)h(our)f
(de\014nition)g(of)h(theft.)52 b(The)33 b(windo)n(w)f(attributes)g(are)
523 1116 y(class,)h(bac)n(kground-pixmap,)e(b)r(order-pixmap,)i(and)f
(colormap.)50 b(All)33 b(of)f(these)h(can)f(b)r(e)523
1216 y(set)21 b(with)h(CreateWindo)n(w;)h(all)e(but)h(class)e(can)h(b)r
(e)h(set)f(with)h(ChangeWindo)n(wA)n(ttributes.)523 1365
y(These)39 b(forms)g(of)g(theft)h(aren't)f(particularly)f(serious,)j
(so)d(sending)h(an)g(error)e(do)r(esn't)523 1465 y(seem)21
b(appropriate.)33 b(Substitution)23 b(of)e(di\013eren)n(t)h(attribute)g
(v)-5 b(alues)21 b(seems)g(to)g(b)r(e)h(the)g(only)523
1565 y(reasonable)f(option,)j(and)g(ev)n(en)e(that)i(is)f(lik)n(ely)g
(to)g(cause)g(trouble)g(for)g(clien)n(ts.)35 b(Un)n(trusted)523
1664 y(clien)n(ts)19 b(are)g(already)f(going)g(to)i(b)r(e)g(prev)n(en)n
(ted)e(from)h(creating)g(windo)n(ws)f(that)i(are)f(c)n(hildren)523
1764 y(of)i(trusted)h(clien)n(ts)f(\(see)g(CreateWindo)n(w)g(b)r(elo)n
(w\).)35 b(W)-7 b(e)21 b(recommend)g(that)h(nothing)f(more)523
1863 y(b)r(e)28 b(done)f(to)h(coun)n(ter)f(this)g(threat.)523
2146 y Fb(3.3)112 b(Ov)m(erride-redirect)523 2349 y Ff(Windo)n(ws)25
b(with)h(the)g(o)n(v)n(erride-redirect)d(bit)j(set)g(to)f(T)-7
b(rue)25 b(are)g(generally)f(ignored)h(b)n(y)g(the)523
2448 y(windo)n(w)36 b(manager.)61 b(A)37 b(clien)n(t)f(can)g(map)g(an)g
(o)n(v)n(erride-redirect)d(windo)n(w)j(that)h(co)n(v)n(ers)523
2548 y(most)23 b(or)g(all)g(of)g(the)h(screen,)f(causing)g(denial)g(of)
g(service)f(since)h(other)g(applications)g(w)n(on't)523
2648 y(b)r(e)28 b(visible.)523 2797 y(T)-7 b(o)28 b(prev)n(en)n(t)f
(this,)i(the)g(serv)n(er)e(could)h(prev)n(en)n(t)f(more)h(than)g(a)g
(certain)g(p)r(ercen)n(tage)f(\(con-)523 2897 y(\014gurable\))d(the)h
(of)f(screen)g(area)f(from)i(b)r(eing)f(co)n(v)n(ered)f(b)n(y)h(o)n(v)n
(erride-redirect)e(windo)n(ws)h(of)523 2996 y(un)n(trusted)28
b(clien)n(ts.)523 3146 y(Ov)n(erride-redirect)39 b(windo)n(ws)i(also)f
(mak)n(e)h(some)g(sp)r(o)r(o\014ng)g(attac)n(ks)g(easier)f(since)i(the)
523 3245 y(clien)n(t)31 b(can)g(more)f(carefully)h(con)n(trol)f(the)h
(presen)n(tation)f(of)h(the)h(windo)n(w)e(to)h(mimic)h(an-)523
3345 y(other)27 b(clien)n(t.)37 b(Defenses)28 b(against)e(sp)r(o)r
(o\014ng)h(will)h(b)r(e)g(giv)n(en)f(under)g(MapWindo)n(w.)523
3669 y Fd(4)135 b(Securit)l(y)45 b(concerns)f(with)i(sp)t(eci\014c)e
(requests)523 3901 y Ff(T)-7 b(o)18 b(reduce)h(the)g(space)f(needed)h
(to)f(discuss)h(120)e(requests,)j(most)e(of)h(the)g(follo)n(wing)f
(sections)523 4001 y(use)30 b(a)g(st)n(ylized)h(format.)45
b(A)30 b(threat)h(is)f(giv)n(en,)h(follo)n(w)n(ed)e(b)n(y)h(an)g(imp)r
(erativ)n(e)g(statemen)n(t.)523 4100 y(The)g(implied)h(sub)5
b(ject)31 b(is)f(an)g(un)n(trusted)g(clien)n(t,)h(and)g(the)f(ob)5
b(ject)30 b(is)h(usually)e(a)h(trusted)523 4200 y(clien)n(t.)36
b(F)-7 b(ollo)n(wing)22 b(that,)j(another)e(statemen)n(t)h(starting)f
(with)h(\\Defense:")34 b(recommends)523 4300 y(a)27 b(coun)n
(termeasure)f(for)h(the)h(preceding)f(threat\(s\).)523
4449 y(Resources)32 b(o)n(wned)h(b)n(y)g(the)g(serv)n(er,)h(suc)n(h)f
(as)f(the)i(ro)r(ot)f(windo)n(w)f(and)i(the)f(default)h(col-)523
4549 y(ormap,)27 b(are)f(considered)h(to)g(b)r(e)h(o)n(wned)f(b)n(y)h
(a)f(trusted)g(clien)n(t.)1934 5147 y(8)p eop end
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(hild)g(of)h(another)e(clien)n(t's)h(windo)n(w,)h(altering)e(its)523
917 y(list)e(of)f(c)n(hildren.)523 1066 y(Defense:)54
b(send)36 b(Windo)n(w)g(error.)59 b(Sp)r(ecifying)37
b(the)f(ro)r(ot)f(windo)n(w)h(as)f(the)h(paren)n(t)f(will)523
1166 y(ha)n(v)n(e)26 b(to)i(b)r(e)g(allo)n(w)n(ed,)e(though.)523
1316 y(Theft:)37 b(create)26 b(an)h(InputOnly)g(windo)n(w)g(or)f(a)g
(windo)n(w)h(with)g(bac)n(kground)e(none)i(on)f(top)523
1415 y(of)e(other)f(clien)n(ts')g(windo)n(ws,)h(select)g(for)f(k)n(eyb)
r(oard/mouse)e(input)j(on)g(that)g(windo)n(w,)g(and)523
1515 y(steal)i(the)g(input.)37 b(The)26 b(input)h(can)e(b)r(e)i(resen)n
(t)e(using)g(SendEv)n(en)n(t)h(or)f(an)g(input)i(syn)n(thesis)523
1614 y(extension)36 b(so)g(that)g(the)h(sno)r(op)r(ed)f(application)g
(con)n(tin)n(ues)g(to)g(function,)j(though)d(this)523
1714 y(w)n(on't)e(w)n(ork)e(con)n(vincingly)h(with)h(the)g(bac)n
(kground)e(none)i(case)f(b)r(ecause)h(the)g(dra)n(wing)523
1814 y(will)28 b(b)r(e)g(clipp)r(ed.)523 1963 y(Defense:)53
b(send)35 b(an)h(error)d(if)j(a)f(top-lev)n(el)g(InputOnly)g(windo)n(w)
g(is)h(created)e(\(or)h(repar-)523 2063 y(en)n(ted)c(to)h(the)f(ro)r
(ot\).)48 b(Coun)n(termeasures)29 b(for)i(bac)n(kground)e(none)i(and)h
(SendEv)n(en)n(t)e(are)523 2162 y(discussed)d(elsewhere.)523
2312 y(ISSUE:)g(The)f(Motif)h(drag)e(and)h(drop)g(proto)r(col)f
(creates)h(and)g(maps)g(suc)n(h)g(a)g(windo)n(w)g(\(at)523
2411 y Fe(\000)p Ff(100,)p Fe(\000)p Ff(100,)c(size)k(10x10\))d(to)j
(\\cac)n(he)e(frequen)n(tly)h(needed)h(data)f(on)g(windo)n(w)g(prop)r
(erties)523 2511 y(to)g(reduce)g(roundtrip)f(serv)n(er)g(requests.")34
b(Prop)r(osed)24 b(solution:)35 b(w)n(e)25 b(could)g(only)g(send)g(an)
523 2611 y(error)32 b(if)j(the)g(windo)n(w)e(is)i(visible,)g(whic)n(h)g
(w)n(ould)e(require)g(c)n(hec)n(king)g(in,)k(MapWindo)n(w,)523
2710 y(Con\014gureWindo)n(w,)26 b(and)i(Reparen)n(tWindo)n(w.)523
2860 y(Theft:)45 b(resource)29 b(ID)j(guessing)d(\(paren)n(t,)j(bac)n
(kground-pixmap,)e(b)r(order-pixmap,)g(col-)523 2959
y(ormap,)d(and)g(cursor\).)523 3109 y(Defense:)37 b(send)28
b(Windo)n(w,)f(Pixmap,)g(Colormap,)g(or)f(Cursor)g(error.)523
3258 y(Denial)i(of)f(service:)36 b(create)27 b(windo)n(ws)g(un)n(til)h
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b(requests)f(will)g(probably)g(b)r(e)h(needed)g(to)f(complete)h(the)g
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(ot)f(windo)n(w,)p 1314 1063 V 64 w(MOTIF)p 1629 1063
V 30 w(DRA)n(G)p 1908 1063 V 30 w(T)-7 b(AR)n(GETS)34
b(on)f(the)h(windo)n(w)f(giv)n(en)f(in)i(the)p 523 1162
V 548 1162 a(MOTIF)p 838 1162 V 30 w(DRA)n(G)p 1117 1162
V 30 w(WINDO)n(W)c(prop)r(ert)n(y)-7 b(,)29 b(and)p 2086
1162 V 59 w(MOTIF)p 2401 1162 V 29 w(DRA)n(G)p 2679 1162
V 31 w(RECEIVER)p 3155 1162 V 29 w(INF)n(O)523 1262 y(on)h(windo)n(ws)g
(with)g(drop)g(sites.)45 b(Additionally)-7 b(,)31 b(some)f(prop)r
(erties)f(are)h(needed)g(that)h(do)523 1362 y(not)d(ha)n(v)n(e)e
(\014xed)i(names.)523 1644 y Fb(4.15)112 b(RotateProp)s(erties)523
1847 y Ff(Alteration:)37 b(rotate)26 b(prop)r(erties)h(stored)g(b)n(y)g
(another)g(clien)n(t.)523 1996 y(Theft:)38 b(resource)25
b(ID)j(guessing)f(\(windo)n(w\).)523 2146 y(Defense)h(for)f(b)r(oth)h
(of)g(the)g(ab)r(o)n(v)n(e:)35 b(send)28 b(Windo)n(w)f(error.)523
2428 y Fb(4.16)112 b(ListProp)s(erties)523 2631 y Ff(Theft:)38
b(list)27 b(prop)r(erties)g(stored)g(b)n(y)g(another)g(clien)n(t.)523
2780 y(Theft:)38 b(resource)25 b(ID)j(guessing)f(\(windo)n(w\).)523
2930 y(Defense)h(for)f(b)r(oth)h(of)g(the)g(ab)r(o)n(v)n(e:)35
b(send)28 b(Windo)n(w)f(error.)523 3079 y(ISSUE:)h(should)f(certain)g
(ro)r(ot)g(windo)n(w)g(prop)r(erties)g(b)r(e)h(listable?)523
3362 y Fb(4.17)112 b(SetSelectionOwner)523 3565 y Ff(Theft:)38
b(Steal)27 b(o)n(wnership)g(of)g(a)g(selection.)523 3714
y(Denial)19 b(of)g(service:)32 b(do)18 b(this)h(rep)r(eatedly)g(so)f
(that)h(no)g(other)f(clien)n(t)i(can)e(o)n(wn)g(the)i(selection.)523
3863 y(Defense)35 b(for)f(b)r(oth)i(of)e(the)i(ab)r(o)n(v)n(e:)49
b(ha)n(v)n(e)34 b(a)g(con\014gurable)g(list)h(of)f(selections)g(that)h
(un-)523 3963 y(trusted)28 b(clien)n(ts)f(can)g(o)n(wn.)37
b(F)-7 b(or)27 b(other)g(selections,)g(treat)g(this)h(request)f(as)g(a)
g(no-op.)523 4113 y(ISSUE:)e(ho)n(w)f(do)r(es)g(the)h(securit)n(y)f
(manager)f(get)i(in)n(v)n(olv)n(ed)e(here?)36 b(Is)24
b(it)h(the)h(one)e(that)h(has)523 4212 y(the)j(con\014gurable)e(list)i
(of)f(selections)g(instead)h(of)f(the)h(serv)n(er?)523
4362 y(Theft:)38 b(resource)25 b(ID)j(guessing)f(\(windo)n(w\).)523
4511 y(Defense:)37 b(send)28 b(Windo)n(w)f(error.)1914
5147 y(14)p eop end
%%Page: 15 15
TeXDict begin 15 14 bop 523 614 a Fb(4.18)112 b(GetSelectionOwner)523
817 y Ff(Theft:)56 b(disco)n(v)n(er)35 b(the)j(ID)f(of)g(another)f
(clien)n(t's)h(windo)n(w)f(via)h(the)g(o)n(wner)f(\014eld)h(of)g(the)
523 917 y(reply)-7 b(.)523 1066 y(Defense:)37 b(if)27
b(the)h(selection)e(is)h(on)f(the)i(con\014gurable)d(list)i(men)n
(tioned)g(ab)r(o)n(v)n(e,)f(return)g(the)523 1166 y(ro)r(ot)h(windo)n
(w)g(ID,)h(else)f(return)h(None.)523 1316 y(ISSUE:)g(ho)n(w)f(do)r(es)g
(the)h(securit)n(y)f(manager)f(get)h(in)n(v)n(olv)n(ed)f(here?)523
1593 y Fb(4.19)112 b(Con)m(v)m(ertSelection)523 1796
y Ff(Theft:)46 b(this)32 b(initiates)g(a)f(selection)g(transfer)g
(\(see)h(the)g(ICCCM\))g(whic)n(h)f(sends)h(the)g(se-)523
1895 y(lection)e(con)n(ten)n(ts)f(from)h(the)g(selection)f(o)n(wner,)h
(whic)n(h)f(ma)n(y)g(b)r(e)i(another)e(clien)n(t,)h(to)g(the)523
1995 y(requesting)d(clien)n(t.)523 2145 y(Defense:)35
b(since)24 b(in)f(man)n(y)g(cases)g(Con)n(v)n(ertSelection)f(is)h(done)
g(in)h(direct)f(resp)r(onse)g(to)g(user)523 2244 y(in)n(teraction,)29
b(it)h(is)g(probably)f(b)r(est)h(not)f(to)h(force)f(it)h(to)f(fail,)i
(either)e(silen)n(tly)h(or)e(with)j(an)523 2344 y(error.)36
b(The)28 b(serv)n(er)f(should)h(rely)f(on)h(the)g(securit)n(y)f
(manager)g(to)h(assist)f(in)h(handling)g(the)523 2443
y(selection)f(transfer.)523 2593 y(Theft:)38 b(resource)25
b(ID)j(guessing)f(\(requestor\).)523 2742 y(Defense:)37
b(send)28 b(Windo)n(w)f(error.)523 3019 y Fb(4.20)112
b(SendEv)m(en)m(t)523 3223 y Ff(A)30 b(clien)n(t)g(can)f(use)h(SendEv)n
(en)n(t)f(to)g(cause)g(ev)n(en)n(ts)g(of)h(an)n(y)f(t)n(yp)r(e)g(to)h
(b)r(e)g(sen)n(t)g(to)f(windo)n(ws)523 3322 y(of)g(other)g(clien)n(ts.)
41 b(Similarly)-7 b(,)29 b(a)f(clien)n(t)i(could)e(SendEv)n(en)n(t)h
(to)g(one)f(of)h(its)h(o)n(wn)e(windo)n(ws)523 3422 y(with)33
b(prop)r(ogate)d(set)i(to)g(T)-7 b(rue)32 b(and)g(arrange)e(for)h(the)i
(ev)n(en)n(t)e(to)h(b)r(e)h(prop)r(ogated)d(up)j(to)523
3521 y(a)d(windo)n(w)f(it)i(do)r(es)e(not)h(o)n(wn.)44
b(Clien)n(ts)30 b(can)g(detect)g(ev)n(en)n(ts)f(generated)g(b)n(y)h
(SendEv)n(en)n(t,)523 3621 y(but)e(w)n(e)f(cannot)h(assume)e(that)i
(they)g(will.)523 3770 y(Defense:)33 b(ignore)19 b(this)h(request)f
(unless)g(the)h(ev)n(en)n(t)f(b)r(eing)h(sen)n(t)g(is)f(a)h(Clien)n
(tMessage)e(ev)n(en)n(t,)523 3870 y(whic)n(h)29 b(should)f(b)r(e)h(sen)
n(t)g(normally)e(so)h(that)h(selection)f(transfer,)g(Motif)h(drag)e
(and)i(drop,)523 3970 y(and)e(certain)g(input)i(metho)r(ds)f(ha)n(v)n
(e)e(a)h(c)n(hance)g(at)h(w)n(orking.)523 4119 y(ISSUE:)g(do)r(es)f
(allo)n(wing)f(all)i(Clien)n(tMessages)d(op)r(en)j(up)g(to)r(o)f(big)h
(a)f(hole?)523 4269 y(Theft:)38 b(resource)25 b(ID)j(guessing)f
(\(windo)n(w\).)523 4418 y(Defense:)37 b(send)28 b(Windo)n(w)f(error.)
523 4695 y Fb(4.21)112 b(Keyb)s(oard)39 b(and)f(P)m(oin)m(ter)f(Grabs)
523 4898 y Ff(Sp)r(eci\014cally)-7 b(,)28 b(GrabKeyb)r(oard,)d(GrabP)n
(oin)n(ter,)g(GrabKey)-7 b(,)27 b(and)g(GrabButton.)1914
5147 y(15)p eop end
%%Page: 16 16
TeXDict begin 16 15 bop 523 614 a Ff(Denial)37 b(of)f(service/Theft:)54
b(tak)n(e)36 b(o)n(v)n(er)f(the)i(k)n(eyb)r(oard)e(and)h(p)r(oin)n
(ter.)64 b(This)37 b(could)f(b)r(e)523 714 y(view)n(ed)26
b(as)f(denial)h(of)g(service)e(since)i(it)h(prev)n(en)n(ts)d(other)i
(clien)n(ts)g(from)f(getting)h(k)n(eyb)r(oard)523 814
y(or)d(mouse)g(input,)i(or)d(it)i(could)g(b)r(e)g(view)n(ed)f(as)f
(theft)j(since)e(the)h(user)f(input)h(ma)n(y)f(not)h(ha)n(v)n(e)523
913 y(b)r(een)k(in)n(tended)g(for)f(the)h(grabbing)e(clien)n(t.)523
1063 y(Defense:)54 b(pro)n(vide)34 b(a)i(w)n(a)n(y)e(to)i(break)e
(grabs)h(via)g(some)g(k)n(eystrok)n(e)f(com)n(bination,)j(and)523
1162 y(ha)n(v)n(e)25 b(a)g(status)h(area)f(that)h(sho)n(ws)f(whic)n(h)g
(clien)n(t)i(is)e(getting)h(input.)37 b(\(See)26 b(MapWindo)n(w.\))523
1312 y(Theft:)38 b(resource)25 b(ID)j(guessing)f(\(grab-windo)n(w,)f
(con\014ne-to,)h(cursor\).)523 1461 y(Defense:)37 b(send)28
b(Windo)n(w)f(or)g(Cursor)f(error.)523 1743 y Fb(4.22)112
b(ChangeActiv)m(eP)m(oin)m(terGrab)523 1946 y Ff(Theft:)38
b(resource)25 b(ID)j(guessing)f(\(cursor\).)523 2096
y(Defense:)37 b(send)28 b(Cursor)e(error.)523 2378 y
Fb(4.23)112 b(GrabServ)m(er)523 2581 y Ff(Denial)34 b(of)g(service:)49
b(a)34 b(clien)n(t)g(can)g(grab)e(the)j(serv)n(er)d(and)i(not)g(let)h
(go,)f(lo)r(c)n(king)g(out)g(all)523 2681 y(other)27
b(clien)n(ts.)523 2830 y(Defense:)37 b(pro)n(vide)27
b(a)g(w)n(a)n(y)f(to)i(break)e(grabs)g(via)h(some)g(k)n(eystrok)n(e)f
(com)n(bination.)523 3112 y Fb(4.24)112 b(QueryP)m(oin)m(ter)523
3316 y Ff(Theft:)47 b(A)33 b(clien)n(t)g(can)f(steal)g(p)r(oin)n(ter)g
(motion)g(and)g(p)r(osition,)i(button)f(input,)i(mo)r(di\014er)523
3415 y(k)n(ey)27 b(state,)g(and)h(p)r(ossibly)f(a)g(windo)n(w)g(of)h
(another)f(clien)n(t)g(with)h(this)g(request.)523 3565
y(Defense:)34 b(if)22 b(the)f(querying)f(clien)n(t)h(do)r(esn't)g(ha)n
(v)n(e)f(the)h(p)r(oin)n(ter)g(grabb)r(ed,)h(and)e(the)i(p)r(oin)n(ter)
523 3664 y(is)28 b(not)f(in)h(one)f(of)h(its)g(windo)n(ws,)e(the)i
(information)f(can)h(b)r(e)g(zero)r(ed.)523 3814 y(Theft:)38
b(resource)25 b(ID)j(guessing)f(\(windo)n(w\).)523 3963
y(Defense:)37 b(send)28 b(Windo)n(w)f(error.)523 4245
y Fb(4.25)112 b(GetMotionEv)m(en)m(ts)523 4448 y Ff(Theft:)38
b(steal)27 b(p)r(oin)n(ter)g(motion)g(input)i(that)f(w)n(en)n(t)f(to)g
(other)g(clien)n(ts.)523 4598 y(Defense:)49 b(ideally)-7
b(,)35 b(the)e(serv)n(er)f(w)n(ould)h(return)g(only)g(p)r(oin)n(ter)g
(input)h(that)g(w)n(as)e(not)i(de-)523 4697 y(liv)n(ered)g(to)h(an)n(y)
f(trusted)h(clien)n(t.)59 b(The)35 b(implemen)n(tation)g(e\013ort)g(to)
g(do)f(that)i(probably)523 4797 y(out)n(w)n(eighs)31
b(the)h(marginal)e(b)r(ene\014ts.)51 b(Instead,)33 b(w)n(e)e(will)h
(alw)n(a)n(ys)e(return)i(an)f(empt)n(y)h(list)523 4897
y(of)c(motion)f(ev)n(en)n(ts)g(to)g(un)n(trusted)h(clien)n(ts.)1914
5147 y(16)p eop end
%%Page: 17 17
TeXDict begin 17 16 bop 523 614 a Ff(Theft:)38 b(resource)25
b(ID)j(guessing)f(\(windo)n(w\).)523 764 y(Defense:)37
b(send)28 b(Windo)n(w)f(error.)523 1046 y Fb(4.26)112
b(T)-9 b(ranslateCo)s(ordinates)523 1249 y Ff(Theft:)37
b(disco)n(v)n(er)24 b(information)i(ab)r(out)g(other)g(clien)n(ts')g
(windo)n(ws:)35 b(p)r(osition,)27 b(screen,)f(and)523
1349 y(p)r(ossibly)h(the)h(ID)g(of)g(one)f(of)h(their)f(sub)n(windo)n
(ws.)523 1498 y(Defense:)51 b(send)35 b(an)f(error)f(if)i(src-windo)n
(w)d(or)i(dst-windo)n(w)g(do)g(not)h(b)r(elong)f(to)g(the)h(re-)523
1598 y(questing)27 b(clien)n(t.)523 1747 y(Theft:)38
b(resource)25 b(ID)j(guessing)f(\(src-windo)n(w,)f(dst-windo)n(w\).)523
1897 y(Defense:)37 b(send)28 b(Windo)n(w)f(error.)523
2179 y Fb(4.27)112 b(W)-9 b(arpP)m(oin)m(ter)523 2382
y Ff(A)28 b(clien)n(t)g(can)f(cause)g(p)r(oin)n(ter)g(motion)g(to)h(o)r
(ccur)f(in)h(another)e(clien)n(t's)i(windo)n(w.)523 2531
y(Denial)35 b(of)g(service:)50 b(rep)r(eated)34 b(p)r(oin)n(ter)g(w)n
(arping)g(prev)n(en)n(ts)f(the)i(user)f(from)h(using)f(the)523
2631 y(mouse)27 b(normally)-7 b(.)523 2780 y(Defense)33
b(for)e(b)r(oth)i(of)f(the)h(ab)r(o)n(v)n(e:)44 b(if)33
b(the)g(querying)e(clien)n(t)h(do)r(esn't)g(ha)n(v)n(e)f(the)i(p)r(oin)
n(ter)523 2880 y(grabb)r(ed,)i(and)f(the)h(p)r(oin)n(ter)f(is)g(not)g
(in)h(one)e(of)i(its)f(windo)n(ws,)h(treat)f(the)h(request)e(as)h(a)523
2980 y(no-op.)523 3129 y(Theft:)k(resource)25 b(ID)j(guessing)f
(\(src-windo)n(w,)f(dst-windo)n(w\).)523 3279 y(Defense:)37
b(send)28 b(Windo)n(w)f(error.)523 3561 y Fb(4.28)112
b(SetInputF)-9 b(o)s(cus)523 3764 y Ff(Theft:)46 b(a)32
b(clien)n(t)g(can)f(use)h(this)g(request)g(to)f(mak)n(e)g(one)h(of)g
(its)g(o)n(wn)f(windo)n(ws)g(ha)n(v)n(e)g(the)523 3863
y(input)36 b(fo)r(cus)g(\(k)n(eyb)r(oard)e(fo)r(cus\).)61
b(The)35 b(user)g(ma)n(y)g(b)r(e)h(una)n(w)n(are)e(that)h(k)n(eystrok)n
(es)e(are)523 3963 y(no)n(w)27 b(going)f(to)i(a)f(di\013eren)n(t)h
(windo)n(w.)523 4113 y(Denial)38 b(of)h(service:)56 b(rep)r(eatedly)38
b(setting)g(input)h(fo)r(cus)g(prev)n(en)n(ts)e(normal)g(use)h(of)g
(the)523 4212 y(k)n(eyb)r(oard.)523 4362 y(Defense)28
b(for)f(b)r(oth)h(of)g(the)g(ab)r(o)n(v)n(e:)35 b(only)27
b(allo)n(w)g(un)n(trusted)g(clien)n(ts)h(to)f(SetInputF)-7
b(o)r(cus)29 b(if)523 4461 y(input)f(fo)r(cus)g(is)g(curren)n(tly)e
(held)i(b)n(y)f(another)g(un)n(trusted)h(clien)n(t.)523
4611 y(ISSUE:)g(this)f(will)h(break)e(clien)n(ts)i(using)f(the)h
(Globally)e(Activ)n(e)i(Input)g(mo)r(del)g(describ)r(ed)523
4710 y(in)g(section)f(4.1.7)f(of)i(the)g(ICCCM.)523 4860
y(Theft:)38 b(resource)25 b(ID)j(guessing)f(\(fo)r(cus\).)1914
5147 y(17)p eop end
%%Page: 18 18
TeXDict begin 18 17 bop 523 614 a Ff(Defense:)37 b(send)28
b(Windo)n(w)f(error.)523 897 y Fb(4.29)112 b(GetInputF)-9
b(o)s(cus)523 1100 y Ff(Theft:)38 b(the)28 b(reply)f(ma)n(y)g(con)n
(tain)f(the)i(ID)h(of)e(another)g(clien)n(t's)g(windo)n(w.)523
1249 y(Defense:)52 b(return)35 b(a)f(fo)r(cus)i(windo)n(w)e(of)h(None)g
(if)h(a)e(trusted)h(clien)n(t)g(curren)n(tly)f(has)h(the)523
1349 y(input)28 b(fo)r(cus.)523 1631 y Fb(4.30)112 b(QueryKeymap)523
1834 y Ff(Theft:)38 b(p)r(oll)27 b(the)h(k)n(eyb)r(oard)e(with)i(this)g
(to)g(see)f(whic)n(h)h(k)n(eys)e(are)h(b)r(eing)h(pressed.)523
1983 y(Defense:)37 b(zero)26 b(the)i(returned)f(bit)h(v)n(ector)e(if)h
(a)g(trusted)h(clien)n(t)f(curren)n(tly)f(has)h(the)h(input)523
2083 y(fo)r(cus.)523 2365 y Fb(4.31)112 b(F)-9 b(on)m(t)38
b(Requests)523 2568 y Ff(Sp)r(eci\014cally)-7 b(,)35
b(Op)r(enF)-7 b(on)n(t,)36 b(QueryF)-7 b(on)n(t,)34 b(ListF)-7
b(on)n(ts,)35 b(ListF)-7 b(on)n(tsWithInfo,)35 b(and)f(Query-)523
2668 y(T)-7 b(extExten)n(ts.)523 2817 y(Theft:)36 b(disco)n(v)n(er)22
b(fon)n(t)i(name,)h(glyph,)g(and)f(metric)g(information)g(ab)r(out)g
(fon)n(ts)g(that)g(w)n(ere)523 2917 y(pro)n(vided)33
b(b)n(y)i(another)e(clien)n(t)h(\(b)n(y)h(setting)f(the)h(fon)n(t)g
(path\).)57 b(Whether)35 b(it)g(is)f(theft)i(to)523 3017
y(retriev)n(e)29 b(information)g(ab)r(out)g(fon)n(ts)h(from)g(the)g
(serv)n(er's)e(initial)i(fon)n(t)f(path)h(dep)r(ends)h(on)523
3116 y(whether)21 b(or)g(not)g(y)n(ou)g(b)r(eliev)n(e)g(those)g(fon)n
(ts,)i(b)n(y)e(their)g(existence)h(in)f(the)h(initial)g(fon)n(t)f
(path,)523 3216 y(are)27 b(in)n(tended)h(to)f(b)r(e)h(globally)e
(accessible)h(b)n(y)g(all)h(clien)n(ts.)523 3365 y(Defense:)523
3515 y(Main)n(tain)f(t)n(w)n(o)f(separate)f(fon)n(t)i(paths,)g(one)g
(for)f(trusted)h(clien)n(ts)g(and)f(one)h(for)f(un)n(trusted)523
3614 y(clien)n(ts.)35 b(They)23 b(are)f(b)r(oth)i(initialized)f(to)g
(the)g(default)h(fon)n(t)f(path)g(at)g(serv)n(er)e(reset.)35
b(Subse-)523 3714 y(quen)n(tly)-7 b(,)27 b(c)n(hanges)e(to)h(one)g(do)g
(not)g(a\013ect)g(the)h(other.)36 b(Since)26 b(un)n(trusted)h(clien)n
(ts)f(will)g(not)523 3814 y(see)h(fon)n(t)h(path)g(elemen)n(ts)g(added)
f(b)n(y)h(trusted)f(clien)n(ts,)h(they)g(will)g(not)g(b)r(e)g(able)f
(to)h(access)523 3913 y(an)n(y)f(fon)n(ts)g(pro)n(vided)g(b)n(y)g
(those)g(fon)n(t)h(path)g(elemen)n(ts.)523 4063 y(Theft:)38
b(resource)25 b(ID)j(guessing)f(\(fon)n(t\))h(\(QueryF)-7
b(on)n(t)27 b(and)g(QueryT)-7 b(extExten)n(ts)26 b(only\).)523
4212 y(Defense:)37 b(send)28 b(F)-7 b(on)n(t)27 b(error.)523
4362 y(Denial)34 b(of)g(service:)48 b(op)r(en)34 b(fon)n(ts)f(un)n(til)
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%%Page: 19 19
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b(another)h(clien)n(t's)g(pixmap.)1914 5147 y(19)p eop
end
%%Page: 20 20
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(tile,)i(stipple,)g(fon)n(t,)g(clip-mask\).)523 1242
y(Defense:)37 b(send)28 b(Dra)n(w)n(able,)e(Pixmap,)h(or)g(F)-7
b(on)n(t)27 b(error.)523 1391 y(Denial)h(of)f(service:)36
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b(send)28 b(GC)g(error.)523 4097 y Fb(4.41)112 b(Dra)m(wing)38
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n(olyArc,)f(FillP)n(oly)-7 b(,)21 b(P)n(olyFillRectangle,)f(P)n
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b(ext8,)26 b(P)n(olyT)-7 b(ext16,)25 b(ImageT)-7 b(ext8,)26
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b(-)i(windo)n(w;)f(Cop)n(yArea,)g(Cop)n(yPlane)f(-)h(src-)523
4898 y(dra)n(w)n(able,)f(dst-dra)n(w)n(able,)g(gc;)h(all)g(others)g(-)g
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%%Page: 21 21
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y(Defense:)37 b(send)28 b(Colormap)e(error.)523 3229
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5147 y(21)p eop end
%%Page: 22 22
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b(\(un\)install)20 b(an)n(y)e(colormap,)h(p)r(oten)n(tially)g(prev)n
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b(send)28 b(Colormap)e(error.)523 3378 y(Theft:)38 b(disco)n(v)n(er)25
b(the)j(resource)e(ID)i(of)g(another)e(clien)n(t's)i(colormap)e(from)h
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4113 y Ff(Sp)r(eci\014cally)-7 b(,)47 b(Allo)r(cColor,)e(Allo)r
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4212 y(Planes.)523 4362 y(Alteration/Denial)29 b(of)h(service:)41
b(allo)r(cate)29 b(colors)f(in)i(another)f(clien)n(t's)h(colormap.)42
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b(default)f(colormaps)1914 5147 y(22)p eop end
%%Page: 23 23
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1531 y Fb(4.50)112 b(StoreColors,)38 b(StoreNamedColor)523
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b(send)26 b(Pixmap)g(or)f(F)-7 b(on)n(t)27 b(error.)34
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%%Page: 24 24
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(t.)1914 5147 y(24)p eop end
%%Page: 25 25
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b(c)n(hange)37 b(the)i(p)r(oin)n(ter)f(parameters)f(that)i(w)n(ere)f
(established)g(b)n(y)g(another)523 1299 y(clien)n(t.)523
1448 y(Denial)31 b(of)g(service:)42 b(set)30 b(the)h(p)r(oin)n(ter)g
(parameters)e(so)h(that)h(the)g(p)r(oin)n(ter)f(is)h(di\016cult)g(or)
523 1548 y(imp)r(ossible)d(to)f(use.)523 1697 y(Defense)h(for)f(b)r
(oth)h(of)g(the)g(ab)r(o)n(v)n(e:)35 b(treat)27 b(these)h(requests)f
(as)g(a)g(no-op.)523 1980 y Fb(4.60)112 b(GetP)m(oin)m(terCon)m(trol,)
37 b(GetP)m(oin)m(terMapping)523 2183 y Ff(Theft:)h(get)27
b(p)r(oin)n(ter)g(parameters)f(that)i(w)n(ere)f(established)g(b)n(y)g
(another)g(clien)n(t.)523 2332 y(Defense:)46 b(This)32
b(is)g(a)g(minor)g(form)f(of)h(theft.)52 b(W)-7 b(e)32
b(prop)r(ose)f(to)h(do)g(nothing)g(ab)r(out)g(this)523
2432 y(threat.)523 2714 y Fb(4.61)112 b(SetScreenSa)m(v)m(er)523
2917 y Ff(Alteration:)33 b(c)n(hange)20 b(the)h(screen)f(sa)n(v)n(er)f
(parameters)g(that)i(w)n(ere)f(established)h(b)n(y)f(another)523
3017 y(clien)n(t.)523 3166 y(Denial)35 b(of)g(service:)50
b(set)35 b(the)g(screen)f(sa)n(v)n(er)f(parameters)g(so)h(that)h(the)h
(screen)e(sa)n(v)n(er)e(is)523 3266 y(alw)n(a)n(ys)26
b(on)h(or)g(alw)n(a)n(ys)e(o\013.)523 3415 y(Defense)j(for)f(b)r(oth)h
(of)g(the)g(ab)r(o)n(v)n(e:)35 b(treat)27 b(these)h(requests)f(as)g(a)g
(no-op.)523 3697 y Fb(4.62)112 b(GetScreenSa)m(v)m(er)523
3900 y Ff(Theft:)38 b(get)27 b(screen)g(sa)n(v)n(er)e(parameters)h
(that)i(w)n(ere)f(established)g(b)n(y)g(another)g(clien)n(t.)523
4050 y(Defense:)46 b(This)32 b(is)g(a)g(minor)g(form)f(of)h(theft.)52
b(W)-7 b(e)32 b(prop)r(ose)f(to)h(do)g(nothing)g(ab)r(out)g(this)523
4149 y(threat.)523 4432 y Fb(4.63)112 b(F)-9 b(orceScreenSa)m(v)m(er)
523 4635 y Ff(Denial)31 b(of)f(service:)42 b(rep)r(eatedly)30
b(activ)-5 b(ate)31 b(the)g(screen)e(sa)n(v)n(er)g(so)h(that)h(the)g
(user)f(cannot)523 4734 y(see)d(the)h(screen)f(as)g(it)h(w)n(ould)f(lo)
r(ok)g(when)h(the)g(screen)f(sa)n(v)n(er)e(is)j(o\013.)523
4884 y(Denial)19 b(of)f(service:)31 b(rep)r(eatedly)18
b(reset)g(the)h(screen)e(sa)n(v)n(er,)i(prev)n(en)n(ting)e(it)i(from)f
(activ)-5 b(ating.)1914 5147 y(25)p eop end
%%Page: 26 26
TeXDict begin 26 25 bop 523 614 a Ff(Defense)28 b(for)f(b)r(oth)h(of)g
(the)g(ab)r(o)n(v)n(e:)35 b(treat)27 b(these)h(requests)f(as)g(a)g
(no-op.)523 897 y Fb(4.64)112 b(ChangeHost)523 1100 y
Ff(Most)20 b(serv)n(ers)d(already)i(ha)n(v)n(e)f(some)h(restrictions)g
(on)g(whic)n(h)h(clien)n(ts)g(can)f(use)h(this)g(request,)523
1199 y(so)27 b(whether)g(the)h(follo)n(wing)f(list)h(applies)f(is)g
(implemen)n(tation)h(dep)r(enden)n(t.)523 1349 y(Denial)21
b(of)g(service:)32 b(remo)n(v)n(e)19 b(a)h(host)h(from)f(the)h(list,)h
(prev)n(en)n(ting)e(clien)n(ts)h(from)f(connecting)523
1448 y(from)27 b(that)h(host.)523 1598 y(Add)f(a)e(host)h(to)g(the)g
(list.)37 b(Clien)n(ts)25 b(from)h(that)g(host)g(ma)n(y)f(then)i(launc)
n(h)e(other)h(attac)n(ks)e(of)523 1697 y(an)n(y)j(t)n(yp)r(e.)523
1847 y(Defense)h(for)f(b)r(oth)h(of)g(the)g(ab)r(o)n(v)n(e:)35
b(return)27 b(Access)g(error.)523 2129 y Fb(4.65)112
b(ListHosts)523 2332 y Ff(Theft:)37 b(steal)25 b(host)h(iden)n(tities)g
(and)g(p)r(ossibly)f(ev)n(en)h(user)f(iden)n(tities)h(that)g(are)f
(allo)n(w)n(ed)g(to)523 2432 y(connect.)523 2581 y(Launc)n(h)i(attac)n
(ks)g(of)g(an)n(y)g(t)n(yp)r(e)h(against)e(the)i(stolen)f(host/user)g
(iden)n(tities.)523 2731 y(Defense)h(for)f(b)r(oth)h(of)g(the)g(ab)r(o)
n(v)n(e:)35 b(return)27 b(only)h(un)n(trusted)f(hosts.)523
3013 y Fb(4.66)112 b(SetAccessCon)m(trol)523 3216 y Ff(Most)20
b(serv)n(ers)d(already)i(ha)n(v)n(e)f(some)h(restrictions)g(on)g(whic)n
(h)h(clien)n(ts)g(can)f(use)h(this)g(request,)523 3316
y(so)27 b(whether)g(the)h(follo)n(wing)f(list)h(applies)f(is)g
(implemen)n(tation)h(dep)r(enden)n(t.)523 3465 y(Alteration:)37
b(c)n(hange)26 b(the)i(access)e(con)n(trol)h(v)-5 b(alue)27
b(established)g(b)n(y)h(some)f(other)g(clien)n(t.)523
3614 y(Disable)k(access)e(con)n(trol,)i(allo)n(wing)e(clien)n(ts)i(to)f
(connect)h(who)f(w)n(ould)h(normally)e(not)i(b)r(e)523
3714 y(able)c(to)h(connect.)36 b(Those)27 b(clien)n(ts)h(ma)n(y)f(then)
h(launc)n(h)f(other)g(attac)n(ks)f(of)i(an)n(y)f(t)n(yp)r(e.)523
3863 y(Defense)h(for)f(b)r(oth)h(of)g(the)g(ab)r(o)n(v)n(e:)35
b(return)27 b(Access)g(error.)523 4146 y Fb(4.67)112
b(SetCloseDo)m(wnMo)s(de)523 4349 y Ff(Denial)28 b(of)f(service:)36
b(set)27 b(the)h(close-do)n(wn)d(mo)r(de)j(to)f(RetainP)n(ermanen)n(t)f
(or)h(RetainT)-7 b(em-)523 4448 y(p)r(orary)g(,)36 b(then)g
(disconnect.)61 b(The)35 b(serv)n(er)f(cannot)h(reuse)g(the)h
(resource-id-base)c(of)k(the)523 4548 y(disconnected)c(clien)n(t,)h(or)
e(the)i(memory)e(used)h(b)n(y)g(the)g(retained)g(resources,)f(unless)h
(an-)523 4648 y(other)19 b(clien)n(t)g(issues)g(an)h(appropriate)d
(KillClien)n(t)j(to)f(cancel)g(the)h(retainmen)n(t.)34
b(The)19 b(serv)n(er)523 4747 y(has)25 b(a)h(limited)g(n)n(um)n(b)r(er)
f(of)h(resource-id-bases,)d(and)j(when)g(they)f(are)g(exhausted,)h(it)g
(will)523 4847 y(b)r(e)i(unable)g(to)f(accept)g(new)h(clien)n(t)g
(connections.)1914 5147 y(26)p eop end
%%Page: 27 27
TeXDict begin 27 26 bop 523 614 a Ff(Defense:)37 b(treat)28
b(this)f(request)g(as)g(a)h(no-op.)523 895 y Fb(4.68)112
b(KillClien)m(t)523 1098 y Ff(Destruction/Denial)27 b(of)h(service:)36
b(kill)27 b(another)g(curren)n(tly)f(connected)i(clien)n(t.)523
1248 y(Destruction:)37 b(kill)28 b(a)f(clien)n(t)h(that)g(has)f
(terminated)g(with)h(close-do)n(wn)e(mo)r(de)i(of)g(Retain-)523
1347 y(T)-7 b(emp)r(orary)26 b(or)h(RetainP)n(ermanen)n(t,)f(destro)n
(ying)g(all)h(its)h(retained)f(resources.)523 1497 y(Destruction:)44
b(sp)r(ecify)32 b(AllT)-7 b(emp)r(orary)30 b(as)h(the)g(resource,)g
(destro)n(ying)e(all)i(resources)e(of)523 1596 y(clien)n(ts)e(that)h
(ha)n(v)n(e)f(terminated)g(with)h(close-do)n(wn)e(mo)r(de)i(RetainT)-7
b(emp)r(orary)g(.)523 1746 y(Defense)28 b(for)f(all)g(of)h(the)g(ab)r
(o)n(v)n(e:)35 b(return)28 b(V)-7 b(alue)27 b(error.)523
2027 y Fb(4.69)112 b(Clean)39 b(Requests)523 2230 y Ff(Other)29
b(than)g(denial)g(of)g(service)g(caused)f(b)n(y)h(\015o)r(o)r(ding,)g
(these)h(requests)e(ha)n(v)n(e)g(no)h(kno)n(wn)523 2330
y(securit)n(y)38 b(concerns:)59 b(Allo)n(wEv)n(en)n(ts,)40
b(UngrabP)n(oin)n(ter,)f(UngrabButton,)i(UngrabKey-)523
2429 y(b)r(oard,)27 b(UngrabKey)-7 b(,)26 b(UngrabServ)n(er,)f(NoOp)r
(eration,)i(and)g(Bell.)523 2752 y Fd(5)135 b(Ev)l(en)l(ts)523
2984 y Ff(The)23 b(only)g(threat)g(p)r(osed)f(b)n(y)h(ev)n(en)n(ts)f
(is)h(theft.)37 b(Selecting)23 b(for)f(ev)n(en)n(ts)h(on)f(another)g
(clien)n(t's)523 3084 y(resources)36 b(is)h(alw)n(a)n(ys)f(theft.)69
b(W)-7 b(e)38 b(restrict)f(further)h(analysis)e(b)n(y)i(assuming)f
(that)h(the)523 3183 y(clien)n(t)j(only)f(selects)g(for)g(ev)n(en)n(ts)
f(on)h(its)h(o)n(wn)f(resources,)h(then)g(asking)f(whether)g(the)523
3283 y(ev)n(en)n(ts)27 b(pro)n(vide)f(information)h(ab)r(out)h(other)f
(clien)n(ts.)523 3564 y Fb(5.1)112 b(KeymapNotify)523
3767 y Ff(Theft:)37 b(the)27 b(state)g(of)g(the)g(k)n(eyb)r(oard)e(can)
i(b)r(e)g(seen)g(when)g(the)g(clien)n(t)g(do)r(es)f(not)h(ha)n(v)n(e)f
(the)523 3866 y(input)h(fo)r(cus.)36 b(This)26 b(is)g(p)r(ossible)g(b)r
(ecause)f(a)h(KeymapNotify)f(is)h(sen)n(t)g(to)g(a)f(windo)n(w)h(after)
523 3966 y(ev)n(ery)g(En)n(terNotify)h(ev)n(en)g(if)i(the)f(windo)n(w)f
(do)r(es)g(not)h(ha)n(v)n(e)e(input)i(fo)r(cus.)523 4115
y(Defense:)37 b(zero)26 b(the)i(returned)f(bit)h(v)n(ector)e(if)h(a)g
(trusted)h(clien)n(t)f(curren)n(tly)f(has)h(the)h(input)523
4215 y(fo)r(cus.)523 4496 y Fb(5.2)112 b(Exp)s(ose)523
4699 y Ff(Theft:)48 b(disco)n(v)n(er)30 b(where)i(other)g(clien)n(ts')h
(windo)n(ws)f(o)n(v)n(erlap)e(y)n(our)h(o)n(wn.)52 b(F)-7
b(or)32 b(instance,)523 4799 y(map)26 b(a)g(full-screen)f(windo)n(w,)h
(lo)n(w)n(er)f(it,)i(then)g(raise)e(it.)37 b(The)26 b(resulting)f(exp)r
(oses)h(tell)g(y)n(ou)523 4898 y(where)h(other)g(windo)n(ws)g(are.)1914
5147 y(27)p eop end
%%Page: 28 28
TeXDict begin 28 27 bop 523 614 a Ff(Defense:)34 b(ab)r(out)21
b(the)g(only)g(thing)g(y)n(ou)f(could)h(do)g(here)f(is)h(force)f(bac)n
(king)g(store)g(to)h(b)r(e)g(used)523 714 y(on)30 b(un)n(trusted)h
(windo)n(ws,)f(but)h(that)g(w)n(ould)f(probably)f(use)h(to)r(o)g(m)n
(uc)n(h)g(serv)n(er)f(memory)-7 b(.)523 814 y(W)g(e)28
b(prop)r(ose)e(to)i(do)f(nothing)h(ab)r(out)f(this)h(threat.)523
1089 y Fb(5.3)112 b(GraphicsExp)s(osure)523 1292 y Ff(Theft:)48
b(disco)n(v)n(er)30 b(where)i(other)g(clien)n(ts')h(windo)n(ws)f(o)n(v)
n(erlap)e(y)n(our)h(o)n(wn.)52 b(F)-7 b(or)32 b(instance,)523
1391 y(use)i(Cop)n(yArea)f(to)h(cop)n(y)g(the)h(en)n(tire)e(windo)n
(w's)h(area)f(exactly)h(on)g(top)g(of)h(itself.)57 b(The)523
1491 y(resulting)27 b(GraphicsExp)r(osures)e(tell)j(y)n(ou)f(where)g
(the)h(windo)n(w)f(w)n(as)g(obscured.)523 1641 y(Defense:)37
b(see)28 b(Exp)r(ose)e(ab)r(o)n(v)n(e.)36 b(W)-7 b(e)28
b(prop)r(ose)e(to)i(do)f(nothing)g(ab)r(out)h(this)g(threat.)523
1916 y Fb(5.4)112 b(Visibilit)m(yNotify)523 2119 y Ff(Theft:)64
b(this)41 b(ev)n(en)n(t)f(pro)n(vides)f(crude)i(p)r(ositional)f
(information)g(ab)r(out)g(other)g(clien)n(ts,)523 2218
y(though)27 b(the)h(receiv)n(er)e(cannot)h(tell)h(whic)n(h)g(other)f
(clien)n(ts.)523 2368 y(Defense:)43 b(The)31 b(information)f(con)n(ten)
n(t)g(of)g(this)h(ev)n(en)n(t)f(is)h(v)n(ery)e(lo)n(w.)45
b(W)-7 b(e)31 b(prop)r(ose)e(to)i(do)523 2467 y(nothing)c(ab)r(out)h
(this)g(threat.)523 2743 y Fb(5.5)112 b(Reparen)m(tNotify)523
2946 y Ff(Theft:)33 b(the)20 b(paren)n(t)f(windo)n(w)f(ma)n(y)h(b)r
(elong)g(to)g(some)g(other)f(clien)n(t)i(\(probably)e(the)i(windo)n(w)
523 3045 y(manager\).)523 3195 y(Defense:)53 b(If)35
b(the)h(paren)n(t)f(windo)n(w)f(b)r(elongs)h(to)g(a)g(trusted)g(clien)n
(t,)j(return)c(the)i(closest)523 3294 y(ancestor)28 b(windo)n(w)g(that)
i(b)r(elongs)e(to)h(an)g(un)n(trusted)g(clien)n(t,)h(or)e(if)i(suc)n(h)
e(a)h(windo)n(w)g(do)r(es)523 3394 y(not)f(exist,)f(return)g(the)h(ro)r
(ot)f(windo)n(w)g(for)g(the)h(paren)n(t)f(windo)n(w.)523
3543 y(ISSUE:)h(what)f(is)h(the)g(application)f(impact?)523
3819 y Fb(5.6)112 b(Con\014gureNotify)523 4022 y Ff(Theft:)38
b(the)28 b(ab)r(o)n(v)n(e-sibling)d(windo)n(w)i(ma)n(y)g(b)r(elong)g
(to)h(some)f(other)g(clien)n(t.)523 4171 y(Defense:)53
b(return)35 b(None)g(for)f(the)i(ab)r(o)n(v)n(e-sibling)d(windo)n(w)i
(if)h(it)g(b)r(elongs)e(to)h(a)g(trusted)523 4271 y(clien)n(t.)523
4420 y(ISSUE:)28 b(what)f(is)h(the)g(application)f(impact?)523
4695 y Fb(5.7)112 b(Con\014gureRequest)523 4898 y Ff(Theft:)38
b(the)28 b(sibling)f(windo)n(w)g(ma)n(y)g(b)r(elong)g(to)h(some)f
(other)g(clien)n(t.)1914 5147 y(28)p eop end
%%Page: 29 29
TeXDict begin 29 28 bop 523 614 a Ff(Defense:)37 b(return)27
b(None)h(for)f(the)h(sibling)f(windo)n(w)g(if)i(it)f(b)r(elongs)f(to)g
(a)g(trusted)h(clien)n(t.)523 764 y(ISSUE:)g(what)f(is)h(the)g
(application)f(impact?)523 1046 y Fb(5.8)112 b(SelectionClear)523
1249 y Ff(Theft:)38 b(the)28 b(o)n(wner)e(windo)n(w)h(ma)n(y)g(b)r
(elong)g(to)h(some)f(other)g(clien)n(t.)523 1399 y(Defense:)37
b(return)27 b(None)h(for)f(the)h(o)n(wner)e(windo)n(w)i(if)g(it)g(b)r
(elongs)f(to)g(a)g(trusted)h(clien)n(t.)523 1681 y Fb(5.9)112
b(SelectionRequest)523 1884 y Ff(Theft:)38 b(the)28 b(requestor)e
(windo)n(w)h(ma)n(y)g(b)r(elong)g(to)g(some)g(other)g(clien)n(t.)523
2033 y(Defense:)45 b(Blo)r(c)n(king)30 b(this)i(ev)n(en)n(t)f(or)f
(censoring)g(the)i(windo)n(w)e(w)n(ould)h(prev)n(en)n(t)g(selection)523
2133 y(transfers)25 b(from)g(un)n(trusted)h(clien)n(ts)g(to)g(trusted)g
(clien)n(ts)g(from)g(w)n(orking.)34 b(W)-7 b(e)27 b(prop)r(ose)e(to)523
2232 y(do)31 b(nothing)g(in)g(the)h(serv)n(er)d(ab)r(out)i(this)h
(threat.)47 b(The)32 b(securit)n(y)e(manager)f(ma)n(y)i(reduce)523
2332 y(the)d(exp)r(osure)f(of)g(trusted)h(windo)n(w)f(IDs)h(b)n(y)f(b)r
(ecoming)g(the)h(o)n(wner)f(of)g(all)h(selections.)523
2614 y Fb(5.10)112 b(MappingNotify)523 2817 y Ff(Theft:)40
b(disco)n(v)n(er)27 b(k)n(eyb)r(oard,)h(p)r(oin)n(ter,)h(or)f(mo)r
(di\014er)h(mapping)g(information)f(set)h(b)n(y)g(an-)523
2917 y(other)e(clien)n(t.)523 3066 y(Defense:)33 b(An)n(y)20
b(tamp)r(ering)f(with)h(this)g(ev)n(en)n(t)f(will)h(cause)f(clien)n(ts)
g(to)h(ha)n(v)n(e)e(an)i(inconsisten)n(t)523 3166 y(view)26
b(of)g(the)g(k)n(eyb)r(oard)f(or)g(p)r(oin)n(ter)h(button)g
(con\014guration,)f(whic)n(h)h(is)g(lik)n(ely)g(to)g(confuse)523
3266 y(the)i(user.)36 b(W)-7 b(e)28 b(prop)r(ose)f(to)g(do)g(nothing)h
(ab)r(out)f(this)h(threat.)523 3590 y Fd(6)135 b(Errors)523
3822 y Ff(There)27 b(app)r(ear)g(to)g(b)r(e)h(no)g(threats)f(related)g
(to)g(pro)r(cotol)f(errors.)523 4146 y Fd(7)135 b(F)-11
b(uture)44 b(W)-11 b(ork)523 4378 y Ff(The)23 b(next)f(steps)h(are)e
(resolv)n(e)g(the)i(items)f(mark)n(ed)g(ISSUE)g(and)h(to)f(decide)h(if)
g(the)f(defenses)523 4477 y(prop)r(osed)30 b(are)f(reasonable.)44
b(Discussion)30 b(on)g(the)h(securit)n(y@x.org)d(mailing)i(list,)i
(proto-)523 4577 y(t)n(yping,)25 b(and/or)d(starting)i(the)h(implemen)n
(tation)f(should)g(help)h(answ)n(er)e(these)h(questions.)1914
5147 y(29)p eop end
%%Page: 30 30
TeXDict begin 30 29 bop 523 614 a Fd(8)135 b(References)523
846 y Ff(Bellcore,)32 b(\\F)-7 b(ramew)n(ork)30 b(Generic)h(Requiremen)
n(ts)h(for)g(X)g(Windo)n(w)g(System)g(Securit)n(y)-7
b(,")523 946 y(T)g(ec)n(hnical)27 b(Advisory)g(F)-9 b(A-STS-001324,)24
b(Issue)j(1,)h(August)f(1992.)523 1095 y(Dardailler,)c(Daniel,)h
(\\Motif)g(Drag)e(And)i(Drop)f(Proto)r(col,")f(unpublished)i(design)f
(notes.)523 1245 y(Kahn,)34 b(Brian)e(L.,)j(\\Safe)e(Use)g(of)g(X)h
(WINDO)n(W)g(SYSTEM)f(proto)r(col)f(Across)g(a)h(Fire-)523
1344 y(w)n(all",)27 b(unpublished)h(draft,)f(The)h(MITRE)f(Corp)r
(oration,)f(1995.)523 1494 y(Rosen)n(thal,)f(Da)n(vid)h(S.)g(H.,)h
(\\LINX)e(-)h(a)f(Less)g(INsecure)g(X)i(serv)n(er,")c(Sun)k
(Microsystems,)523 1593 y(29th)g(April)h(1989.)523 1743
y(Rosen)n(thal,)23 b(Da)n(vid)f(and)h(Marks,)f(Stuart)h(W.,)h(\\In)n
(ter-Clien)n(t)e(Comm)n(unication)g(Con)n(v)n(en-)523
1842 y(tions)c(Man)n(ual)g(V)-7 b(ersion)17 b(2.0,")i
Fa(ftp://ftp.x.org/p)o(ub/)o(R6)o(.1)o(/xc)o(/d)o(oc/)o(ha)o(rdc)o(op)o
(y/)o(ICC)o(CM)o(/ic)o(cc)o(m.)o(PS.)o(Z)523 1992 y Ff(Sc)n(hei\015er,)
h(Rob)r(ert)e(W.,)j(\\X)d(Windo)n(w)g(System)h(Proto)r(col,")f
Fa(ftp://ftp.x.org)o(/pu)o(b/)o(R6.)o(1/)o(xc)o(/do)o(c/)o(har)o(dc)o
(op)o(y/X)o(Pr)o(oto)o(co)o(l/p)o(ro)o(to)o(.PS)o(.Z)523
2141 y Ff(T)-7 b(reese,)35 b(G.)g(Win\014eld)g(and)f(W)-7
b(olman,)36 b(Alec,)g(\\X)e(Through)f(the)i(Firew)n(all,)g(and)f(Other)
523 2241 y(Application)25 b(Rela)n(ys,")f(Digital)h(Equipmen)n(t)f
(Corp)r(oration)f(Cam)n(bridge)g(Researc)n(h)h(Lab,)523
2340 y(T)-7 b(ec)n(hnical)27 b(Rep)r(ort)g(Series,)g(CRL)h(93/10,)d(Ma)
n(y)i(3,)g(1993.)1914 5147 y(30)p eop end
%%Trailer

userdict /end-hook known{end-hook}if
%%EOF

.