Microsoft Windows Media Player .WMS Arbitrary Script Vulnerability

Bugtraq ID:	1976
Class:	Access Validation Error
CVE:
Remote:	Yes
Local:	No
Published:	Nov 22 2000 12:00AM
Updated:	Nov 22 2000 12:00AM
Credit:	Discovered by GFI and posted in a Microsoft Security Bulletin (MS00-090) on Nov 22, 2000.
Vulnerable:	Microsoft Windows Media Player 7.0 - Microsoft Windows 2000 Professional SP2 - Microsoft Windows 2000 Professional SP2 - Microsoft Windows 2000 Professional SP1 - Microsoft Windows 2000 Professional SP1 - Microsoft Windows 2000 Professional - Microsoft Windows 2000 Professional - Microsoft Windows 95 - Microsoft Windows 95 - Microsoft Windows 98 - Microsoft Windows 98 - Microsoft Windows NT 4.0 SP6a - Microsoft Windows NT 4.0 SP6a - Microsoft Windows NT 4.0 SP6 - Microsoft Windows NT 4.0 SP6 - Microsoft Windows NT 4.0 SP5 - Microsoft Windows NT 4.0 SP5 - Microsoft Windows NT 4.0 SP4 - Microsoft Windows NT 4.0 SP4 - Microsoft Windows NT 4.0 SP3 - Microsoft Windows NT 4.0 SP3 - Microsoft Windows NT 4.0 SP2 - Microsoft Windows NT 4.0 SP2 - Microsoft Windows NT 4.0 SP1 - Microsoft Windows NT 4.0 SP1 - Microsoft Windows NT 4.0 - Microsoft Windows NT 4.0
Not Vulnerable:

Microsoft Windows Media Player .WMS Arbitrary Script Vulnerability

Windows Media Player is an application used for digital audio, and video content viewing.

It is possible for a user running Windows Media Player 7 to enable a skin (.wms) file and unknowingly execute an embedded malicious script. When a user attempts to retrieve a skin (.wms) file it is downloaded and resides on the user's local machine. If Windows Media Player is run with the malicious skin enabled, the Active X component would allow any arbitrary action to be achieved. Depending on internet security settings this vulnerability is also exploitable if the skin file in question resides on a web site. The script could automatically launch when a user visits the web site.

Execution of arbitrary scripts could make it possible for the malicious host to gain rights equivalent to those of the current user.

Microsoft Windows Media Player .WMS Arbitrary Script Vulnerability

Sandro Gauci <[email protected]> has provided the following exploit:

• /data/vulnerabilities/exploits/exploit.zip

Microsoft Windows Media Player .WMS Arbitrary Script Vulnerability

Solution:
Microsoft has released a cumulative patch which eliminates the vulnerability:


Microsoft Windows Media Player 7.0

• Microsoft wm308567
  http://download.microsoft.com/download/winmediaplayer/Update/308567/WI N98MeXP/EN-US/wm308567.exe

Microsoft Windows Media Player .WMS Arbitrary Script Vulnerability

References:

• Frequently Asked Questions: Microsoft Security Bulletin (MS00-090) (Microsoft)
  
• Security flaw discovered in Windows Media Player 7 (GFI)