TippingPoint Zero Day Initiative

Microsoft Internet Explorer CTreeNode Use-After-Free Remote Code Execution Vulnerability

ZDI-13-172: July 26th, 2013


CVSS Score

Affected Vendors

Affected Products

TippingPoint™ IPS Customer Protection

TippingPoint IPS customers are protected against this vulnerability by Digital Vaccine protection filter ID 13042. For further product information on the TippingPoint IPS:

Vulnerability Details

This vulnerability allows remote 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 or open a malicious file.

The specific flaw exists within specific manipulations of styles to allow for a CElement to dispose of a CTreeNode. While unwinding the stack, CElement::ComputeFormats can use the freed memory resulting in a use-after-free condition. An attacker can leverage this situation to execute code under the context of the user running the browser.

Vendor Response

Microsoft has issued an update to correct this vulnerability. More details can be found at:

Disclosure Timeline

    2013-03-29 - Vulnerability reported to vendor
    2013-07-26 - Coordinated public release of advisory


This vulnerability was discovered by:
    Simon Zuckerbraun