Mozilla products fail to properly validate JavaScript constructors

Overview

Mozilla products fail to properly validate references returned by JavaScript constructors. This vulnerability may allow a remote attacker to execute arbitrary code on a vulnerable system.

Description

According to Mozilla Foundation Security Advisory 2006-51:

JavaScript functions have a parent object created using the standard Object() constructor (ECMA-specified behavior) and that this constructor can be redefined by script (also ECMA-specified behavior). If the Object() constructor is changed to return a reference to a privileged object with useful properties it is possible to have attacker-supplied script executed with elevated privileges by calling the function. This could be used to install malware or take other malicious actions.
For more information and a complete list of affected products, refer to Mozilla Foundation Security Advisory 2006-51.

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Impact

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.

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Solution

Apply an update

This vulnerability is addressed in Firefox 1.5.0.5, Thunderbird 1.5.0.5, and SeaMonkey 1.0.3, according to the Mozilla Foundation Security Update 2006-51.

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Disable JavaScript

This vulnerability can be mitigated by disabling JavaScript.

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Vendor Information

687396

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Mozilla, Inc. __ Affected

Updated: July 27, 2006

Status

Affected

Vendor Statement

We have not received a statement from the vendor.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Addendum

Refer to <http://www.mozilla.org/security/announce/2006/mfsa2006-51.html&gt;.

If you have feedback, comments, or additional information about this vulnerability, please send us [email](<mailto:[email protected]?Subject=VU%23687396 Feedback>).

CVSS Metrics

Group	Score	Vector
Base
Temporal
Environmental

References

• <http://www.mozilla.org/security/announce/2006/mfsa2006-51.html&gt;
• <https://bugzilla.mozilla.org/show_bug.cgi?id=340727&gt;
• <http://secunia.com/advisories/19873/&gt;
• <http://secunia.com/advisories/21216/&gt;
• <http://www.securityfocus.com/bid/19181&gt;

Acknowledgements

This vulnerability was reported in Mozilla Foundation Security Advisory 2006-48. Mozilla credits moz_bug_r_a4 with reporting this vulnerability.

This document was written by Jeff Gennari.

Other Information

CVE IDs:	CVE-2006-3807
Severity Metric:	16.03 Date Public: