Microsoft Internet Explorer Multiple CSS Imports Memory Corruption Vulnerability

August 8th, 2006
ZDI-06-026 ZDI-CAN-058

CVE ID

CVE-2006-3451

CVSS Score

None None

Affected Vendors

Microsoft

Affected Products

Internet Explorer

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.

Additional Details

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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