Vulnerability like in topic (connected with vulns in xpdf). More details available here:

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Last few weeks I was talking(mailing) with Derek (xpdf developer ?

btw. really nice guy) about some vulnerabilities in his product. 14th of

October he published path for bugs (not only my vulnerabilites) so i decide

to release advisory?

Oryginal advisory you can find here? I want to write about this

vulnerabilites on blog for several reasons:

1) This is interesting bug in draw image function

2) This vulnerability exists NOT only in xpdf application

3) Adobe Acrobat Reader is vulnerable to this attack too (but ONLY Linux

version !!!)

4) Adobe Acrobat Reader didn?t know about this bug but in his last

release fix this vulnerability.

First reason you can analyse in advisory but what about others? Vulnerable

is:

*) xpdf

*) libpoppler (so it implies vulnerability in for example evince software

? default pdf reader in Fedora Linux ? I made PoC for this

software).

*) Adobe Acrobat Reader ONLY for Linux (versions up to 9.1.1 ? 9.1.2

and 9.1.3 aren?t vuln)

*) Maybe others?

Ok let?s analyse Adobe Acrobat vuln in version 9.1.1:

# gdb ?pid=<smth>

?

?

(gdb) c

Continuing.

Missing separate debuginfo for

/opt/A911/Adobe/Reader9/Reader/intellinux/plug_ins/EFS.api

Program received signal SIGSEGV, Segmentation fault.

0×01499e6d in memmove () from /lib/libc.so.6

Missing separate debuginfos, use: debuginfo-install

GConf2-2.26.2-1.fc11.i586 ORBit2-2.14.17-1.fc11.i586

gamin-0.1.10-4.fc11.i586 gvfs-1.2.3-12.fc11.i586 libidn-1.9-4.i586

nss-mdns-0.10-7.fc11.i586(gdb) bt

#0 0×01499e6d in memmove () from /lib/libc.so.6

#1 0×08a95bdf in ?? ()

#2 0×28371a0a in ?? ()

#3 0×0d2e66aa in ?? ()

#4 0×8e15b1fe in ?? ()

#5 0×8e15b1fe in ?? ()

#6 0xbffb5f7c in ?? ()

#7 0×089e2189 in ?? ()

Backtrace stopped: previous frame identical to this frame (corrupt stack?)

(gdb) x/i $eip

0×1499e6d <memmove+77>: rep movsl %ds:(%esi),%es:(%edi)

(gdb) i r esi edi ds es ecx

esi 0×27b72ffe 666316798

edi 0×42bfe35e 1119871838

ds 0×7b 123

es 0×7b 123

ecx 0×6a23256 111293014

(gdb)

So we have hard evidence that this is probably integer overflow vuln which

causes heap overflow vulnerability :)

PoC for Adobe Acrobat Reader in versions =< 9.1.1 ? private?

yet :)

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(Taken from my blog: http://blog.pi3.com.pl/?p=19)

Best regards,

Adam Zabrocki

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