TippingPoint Zero Day Initiative

Webkit.org Webkit copyNonAttributeProperties Remote Code Execution Vulnerability

ZDI-12-055: April 9th, 2012


CVSS Score

Affected Vendors

Affected Products


Vulnerability Details

This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of WebKit.
User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file.

The flaw exists within the WebCore component as used by WebKit. Specifically within the handling of element properties. When importing a node having a nonattribute property such as an attached event, an object is improperly freed and accessed. A remote attacker can exploit this vulnerability to execute arbitrary code under the context of the browser.

Vendor Response

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

Disclosure Timeline

    2011-12-22 - Vulnerability reported to vendor
    2012-04-09 - Coordinated public release of advisory


This vulnerability was discovered by:
    wushi of team509