Original release date: July 18, 2007
Source: US-CERT

Systems Affected

• Mozilla Firefox
• Mozilla Thunderbird

Other products based on Mozilla components may also be affected.

Overview

The Mozilla web browser and derived products contain several vulnerabilities, the most severe of which could allow a remote attacker to execute arbitrary code on an affected system.

I. Description

Mozilla has released new versions of Firefox and Thunderbird to address several vulnerabilities. Further details about these vulnerabilities are available from Mozilla and the Vulnerability Notes Database. An attacker could exploit these vulnerabilities by convincing a user to view a specially-crafted HTML document, such as a web page or an HTML email message.

II. Impact

While the impacts of the individual vulnerabilities vary, the most severe could allow a remote, unauthenticated attacker to execute arbitrary code on a vulnerable system. An attacker may also be able to cause a denial of service or obtain private information.

III. Solution

Upgrade

These vulnerabilities are addressed in Mozilla Firefox 2.0.0.5 and Thunderbird 2.0.0.5.

Thunderbird 2.0.0.5 was made available on July 19, 2007 and can be downloaded from the Mozilla Thunderbird download page.

Disable JavaScript

Some of these vulnerabilities can be mitigated by disabling JavaScript or using the NoScript extension. For more information about configuring Firefox, please see the Securing Your Web Browser document. Thunderbird disables JavaScript by default.