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 unmo dified. You may not modify it and distribute it or distribute parts of it without the a uthor's written permission. Disclaimer: The opinions expressed in this advisory and program are my own and not of any c ompany. 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 informat ion 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 pr ograms. This may lead to taking full control over user's computer. Details: The problem is the WMP ActiveX Control which allows launching javascript URLs i n 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