Georgi Guninski security advisory #31, 2001



Windows Media Player 7 and IE vulnerability - executing arbitrary programs



Systems affected:

Windows Media Player 7 and IE



Risk: High

Date: 1 January 2001



Legal Notice:

This Advisory is Copyright (c) 2000 Georgi Guninski. You may distribute it unmodified.

You may not modify it and distribute it or distribute parts of it without the author's

written permission.



Disclaimer:

The opinions expressed in this advisory and program are my own and not of any company.

The usual standard disclaimer applies, especially the fact that Georgi Guninski

is not liable for any damages caused by direct or  indirect use of the information

or functionality provided by this advisory or program.

Georgi Guninski, bears no responsibility for content or misuse of this advisory or program or

any derivatives thereof.



Description:



There is a security vulnerability in Windows Media Player 7 exploitable thru IE

which allows reading local files which in turn allows executing arbitratrary programs.

This may lead to taking full control over user's computer.



Details:

The problem is the WMP ActiveX Control which allows launching javascript URLs in arbitrary

already open frames. This allows taking over the frames's DOM. Examine the code for more

info.



The code is:

--------wmp7ie.html------------------------------------------------





---------------------------------------------------------------------



Workaround:

Disable Active Scripting.



Demonstration is available at:

http://www.guninski.com/wmp7ie.html



Vendor status:

Microsoft was contacted on 26 December 2000.



Regards,

Georgi Guninski

http://www.guninski.com