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Extremely critical

Microsoft Internet Explorer "window()" Arbitrary Code Execution Vulnerability

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Release Date:  2005-05-31    Last Update:  2005-12-13    Views:  160,543

Secunia Advisory SA15546

Where:

From remote

Impact:

System access

Solution Status:

Vendor Patch

CVE Reference(s):

Description


Benjamin Tobias Franz has discovered a vulnerability in Internet Explorer, which can be exploited by malicious people to compromise a user's system.

The vulnerability is caused due to certain objects not being initialized correctly when the "window()" function is used in conjunction with the "<body onload>" event. This can be exploited to execute arbitrary code on a vulnerable browser via some specially crafted JavaScript code called directly when a site has been loaded.

Example:
<body onload="window();">

Successful exploitation requires that the user is e.g. tricked into visiting a malicious website.

The vulnerability has been confirmed on a fully patched system with Internet Explorer 6.0 and Microsoft Windows XP SP2, and Internet Explorer 6.0 and Microsoft Windows 2000 SP4.

Note: A PoC exploit has been released for this vulnerability.


Solution:
Apply patches.

Further details available to Secunia VIM customers

Provided and/or discovered by:
Originally reported by:
Benjamin Tobias Franz

Code Execution PoC by:
S. Pearson, Computer Terrorism (UK)

Original Advisory:
S. Pearson:
http://www.computerterrorism.com/research/ie/ct21-11-2005

Microsoft (KB911302):
http://www.microsoft.com/technet/security/advisory/911302.mspx
http://support.microsoft.com/kb/911302

MS05-054 (KB905915):
http://www.microsoft.com/technet/security/Bulletin/MS05-054.mspx

Deep Links:
Links available to Secunia VIM customers

Do you have additional information related to this advisory?

Please provide information about patches, mitigating factors, new versions, exploits, faulty patches, links, and other relevant data by posting comments to this Advisory. You can also send this information to vuln@secunia.com

Subject: Microsoft Internet Explorer "window()" Arbitrary Code Execution Vulnerability

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