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Mozilla may process content-defined setters on object prototypes with elevated privileges

Vulnerability Note VU#575969

Original Release Date: 2006-06-02 | Last Revised: 2007-02-09


Mozilla allows content-defined setters on object prototypes to execute with elevated privileges. This may allow a remote attacker to execute arbitrary code.



A setter is a method in JavaScript that sets the value of a property.

The problem

The setters in Mozilla are called by privileged user interface (UI) code. This elevated privilege can be passed on to the content-provided JavaScript code. Mozilla Firefox and Thunderbird are reported to be vulnerable.


The complete impact of this vulnerability is not yet known.


Apply an update
Refer to Mozilla Foundation Security Advisory 2006-37 for fixed versions of Mozilla products.

Disable JavaScript

This vulnerability can be mitigated by disabling JavaScript.

Vendor Information

Affected   Unknown   Unaffected

Mozilla, Inc.

Updated:  June 02, 2006



Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Vendor Information

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


Please refer to Mozilla Foundation Security Advisory 2006-37.

If you have feedback, comments, or additional information about this vulnerability, please send us email.

CVSS Metrics

Group Score Vector
Base N/A N/A
Temporal N/A N/A
Environmental N/A



Thanks to the Mozilla Foundation Security Advisory for reporting this vulnerability, who in turn credit Paul Nickerson and moz_bug_r_a4.

This document was written by Will Dormann.

Other Information

CVE IDs: CVE-2006-2776
Severity Metric: 11.48
Date Public: 2006-06-01
Date First Published: 2006-06-02
Date Last Updated: 2007-02-09 14:36 UTC
Document Revision: 13

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