Threat Level: green Handler on Duty: Didier Stevens

SANS ISC: URL Update to Internet Explorer URL Handling Vulnerability - SANS Internet Storm Center SANS ISC InfoSec Forums

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URL Update to Internet Explorer URL Handling Vulnerability

Earlier this month, Microsoft published KB943521. This article acknowledged that third party software had to validate URLs before passing them to Internet Explorer, as Internet Explorer will not validate them. Today, Microsoft published an update to the advisory, suggesting limited exploitation of this vulnerability.

Microsoft does not appear to plan to fix the issue in Internet Explorer. Instead, it asks vendors releasing tools that pass URLs to Internet Explorer to validate them.

 Thanks to Chris and Gilbert to alert us of the update! Let us know if you see an exploit in the wild, or if you encounter any 3rd party applications which are not protecting Internet Explorer.

Links: msrc-blog-october-25th-update-to-security-advisory-943521.aspx


I will be teaching next: Application Security: Securing Web Apps, APIs, and Microservices - SANS London June 2022


4479 Posts
ISC Handler
Oct 26th 2007

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