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Mozilla products may allow directory traversal

Vulnerability Note VU#309608

Original Release Date: 2008-02-11 | Last Revised: 2008-02-11


A vulnerability exists in the way Mozilla products with certain extensions handle chrome: URIs that may allow directory traversal.


Mozilla extensions are small add-ons that can be integrated with Mozilla products to provide added functionality. Mozilla products contain a vulnerability in the way chrome: URIs are handled when certain browser extentions are installed. According to the Mozilla Foundation Security Advisory 2008-05:

the chrome: URI scheme improperly allowed directory traversal that could be used to load JavaScript, images, and stylesheets from local files in known locations. This traversal was possible only when the browser had installed add-ons which used "flat" packaging rather than the more popular .jar packaging, and the attacker would need to target that specific add-on.

Mozilla also reports that this vulnerability can be exploited in Mozilla web browsers to obtain cookie data and information about currently opened webpages from the sessionstore.js file.

Mozilla has released a partial list of "flat" packaged extentions.


A remote, unauthorized attacker may be able to execute code on a vulnerable system or view browser history information.


Apply an update
According to the Mozilla Foundation Security Advisory 2008-05 this vulnerability is addressed in Firefox, Thunderbird (unavailable as of 11-Feb-2008) and SeaMonkey 1.1.8.

Vendor Information


Mozilla Affected

Updated:  February 11, 2008



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.


Refer to Mozilla Foundation Security Advisory 2008-05 for more information.

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

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This vulnerability is addressed in Mozilla Foundation Security Advisory 2008-05. Mozilla credits Gerry Eisenhaur for reporting this issue.

This document was written by Chris Taschner.

Other Information

CVE IDs: CVE-2008-0418
Severity Metric: 4.73
Date Public: 2008-02-07
Date First Published: 2008-02-11
Date Last Updated: 2008-02-11 14:52 UTC
Document Revision: 7

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