Advisory Details

August 8th, 2006

Microsoft Internet Explorer Multiple CSS Imports Memory Corruption Vulnerability

ZDI-06-026
ZDI-CAN-058

CVE ID CVE-2006-3451
CVSS SCORE
AFFECTED VENDORS Microsoft
AFFECTED PRODUCTS Internet Explorer
TIPPINGPOINT™ IPS CUSTOMER PROTECTION TippingPoint IPS customers are protected against this vulnerability by Digital Vaccine protection filter ID 4606. For further product information on the TippingPoint IPS: http://www.tippingpoint.com
VULNERABILITY DETAILS

This vulnerability allows attackers to execute arbitrary code on vulnerable installations of Microsoft Internet Explorer. User interaction is required to exploit this vulnerability in that the target must visit a malicious page.

The specific flaw exists due to improper garbage collection when multiple "imports" are used on a "styleSheets" collection. Crafting a long chain of CSS imports in an HTML document results in a memory corruption eventually leading to code execution.

VENDOR RESPONSE Microsoft has issued an update to correct this vulnerability. More details can be found at:
http://www.microsoft.com/technet/security/bulletin/MS06-042.mspx
DISCLOSURE TIMELINE
  • 2006-06-14 - Vulnerability reported to vendor
  • 2006-08-08 - Coordinated public release of advisory
CREDIT Sam Thomas
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