Windows Media Player 6.4 .ASX Buffer Overrun and .WMS Script Execution Vulnerabilities Patch MS00-090

Publisher's description

From Microsoft :

This patch eliminates two security vulnerabilities in Microsoft Windows Media Player. These vulnerabilities could potentially enable a malicious user to cause a program of their choice to run on another user’s computer.

The two vulnerabilities discussed below are unrelated to each other except by the fact that they both affect Windows Media Player. They are packaged in a single patch to make it more convenient to apply. The vulnerabilities are:

• The ".ASX Buffer Overrun" vulnerability. Windows Media Player supports the use of Active Stream Redirector (.ASX) files to enable users to play streaming media that resides on intranet or Internet sites. However, the code that parses .ASX files has an unchecked buffer, and this could potentially enable a malicious user to run code of their choice on the machine of another user. The malicious user could either send an affected file to another user and entice them to run or preview it, or they could host such a file on a Web site and cause it to launch automatically whenever a user visited the site. The code could take any action on the machine that the legitimate user themselves could take.
• The ".WMS Script Execution" vulnerability. Windows Media Player 7 introduced "skins", which allow customization of the look and feel of Windows Media Player. However, a custom skin (.WMS) file could potentially include script which would execute if Windows Media Player was run and that skin was selected. A malicious user could either send a customized skin containing script to another user and try to entice them into using it, or they could host such a file on a Web site and cause it to launch automatically whenever a user visited the site. Because the code would reside on the user’s local machine, it would be able to execute ActiveX controls, including ones not marked "safe for scripting." This would enable the code to take any action that can be accomplished via an ActiveX control.

Note: The ".ASX Buffer Overrun" affects Windows Media Player versions 6.4 and 7. The ".WMS Script Execution" affects only Windows Media Player version 7. The patch installs the correct fix(es) for the particular version of Windows Media Player in use. For more information, read the Windows Media Player vulnerabilities patch FAQ.

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