Vulnerability Note VU#935556

Mozilla products border-rendering code vulnerability using CSS

Overview

A vulnerability in the way Mozilla products and derivative programs handle certain CSS methods could allow a remote attacker to crash the application or execute arbitrary code on a vulnerable system.

I. Description

The Mozilla browser and derived products include support for Content Style Sheets (CSS). A vulnerability has been discovered in the way that these products handle the CSS border-rendering function. According to Mozilla Foundation Security Advisory 2006-11:

As part of the Firefox 1.5 release we fixed several crash bugs to improve the stability of the product. Some of these crashes showed evidence of memory corruption that we presume could be exploited to run arbitrary code and have been applied to the Firefox 1.0.x and Mozilla Suite 1.7.x releases.
While fixing an unexploitable recursion-induced crash Bernd Mielke discovered that the CSS border-rendering code could potentially write past the end of an array....Note: Thunderbird shares the browser engine with Firefox and could be vulnerable if JavaScript were to be enabled in mail. This is not the default setting and we strongly discourage users from running JavaScript in mail.

II. Impact

A remote attacker may be able to crash a vulnerable program or run code of their choosing on an affected system. The attacker-supplied code would be executed with the permissions of the user running the vulnerable program.

III. Solution

Upgrade

The Mozilla Foundation has published Mozilla Foundation Security Advisory 2006-11 in response to this issue. Users are encouraged to review this advisory and upgrade to the fixed versions of the products it describes.

Workarounds

Users, particularly those who are unable to upgrade to a fixed version of the software, are encouraged to disable JavaScript in the affected programs.

Systems Affected

Vendor	Status	Date Notified	Date Updated
Mozilla, Inc.	Vulnerable	17-Apr-2006
Red Hat, Inc.	Vulnerable	17-Apr-2006

References

http://www.mozilla.org/security/announce/2006/mfsa2006-11.html

Credit

Thanks to Mozilla Foundation Security Advisory for reporting this vulnerability. The Mozilla Foundation, in turn, credits Bernd Mielke with reporting this information to them.

This document was written by Chad Dougherty based on information supplied by the Mozilla Foundation.

Other Information

Date Public:	2006-04-11
Date First Published:	2006-04-17
Date Last Updated:	2006-04-17
CERT Advisory:
CVE-ID(s):	CVE-2006-1739
NVD-ID(s):	CVE-2006-1739
US-CERT Technical Alerts:
Metric:	10.80
Document Revision:	7

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Produced 2006 by US-CERT, a government organization
Disclaimers and copyright information

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