Software Engineering Institute

The ECMAScript for XML (E4X) Specification defines the XML.prototype.hasOwnProperty() as a JavaScript method used to determine if an object contains a specific property. Mozilla products fail to properly handle the XML.prototype.hasOwnProperty() method, which can lead to memory corruption.

For more information refer to Mozilla Foundation Security Advisory 2006-65.

A remote, unauthenticated attacker may be able to execute arbitrary code on a vulnerable system. The attacker could also cause the vulnerable application to crash.

Apply an update

According to the Mozilla Foundation Security Update 2006-65, this vulnerability is addressed in Firefox 1.5.0.8, Thunderbird 1.5.0.8, and SeaMonkey 1.0.6.

Note that according to Mozilla:

Firefox 1.5.0.x will be maintained with security and stability updates until April 24, 2007. All users are strongly encouraged to upgrade to Firefox 2.

Disable JavaScript

This vulnerability can be mitigated by disabling JavaScript.