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Microsoft Windows Media Player skin download vulnerability
Secunia Advisory: SA8742
Release Date: 2003-05-07
Popularity: 50,034 views

Critical:
Moderately critical
Impact: System access
Where: From remote
Solution Status: Vendor Patch

OS:Microsoft Windows XP Home Edition
Microsoft Windows XP Professional

Software:Microsoft Windows Media Player 7.x
Microsoft Windows Media Player 8.x

Secunia CVSS-2 Score: Available in Secunia business solutions

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Advisory Content (Page 1 of 3)[ 1 ] [ 2 ] [ 3 ]

Description:
A flaw has been identified in Microsoft Windows Media Player, which could allow malicious HTML documents to place arbitrary files on the users system.

The problem exists because Microsoft Windows Media Player by default accepts and installs skins without prompting the user. Normally this would be safe because these files will be placed in a location set by Windows Media Player. However, a flaw exists which allows a malicious HTML document to supply any path by using hex-encoded backslashes.

The files would still be named .wmz and would be useless for a hacker. However, by manipulating the Content-disposition HTTP header it is also possible to supply arbitrary file extensions.

Existing files can't be overwritten without prompting the user. It could be possible to place .dll files that would be used instead of the original ones by placing them in the "\windows" folder instead of "\windows\system32".

By placing executable files in the "startup" folder it may be possible to execute the code automatically on next reboot or login.

Change Page:
[ 1 ] [ 2 ] [ 3 ]



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