TippingPoint Zero Day Initiative

Mozilla Firefox Web Worker Array Remote Code Execution Vulnerability

ZDI-10-046: April 2nd, 2010


CVSS Score

Affected Vendors

Affected Products

TippingPoint™ IPS Customer Protection

TippingPoint IPS customers are protected against this vulnerability by Digital Vaccine protection filter ID 9619. For further product information on the TippingPoint IPS:

Vulnerability Details

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

The specific flaw exists within the implementation of web worker threads. Due to mishandling the array data type while processing posted messages, a web worker thread can be made to corrupt heap memory. An attacker can exploit this vulnerability to execute arbitrary code under the context of the user running the browser.

Vendor Response

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

Disclosure Timeline

    2009-12-04 - Vulnerability reported to vendor
    2010-04-02 - Coordinated public release of advisory


This vulnerability was discovered by:
    Orlando Barrera II, SecTheory