Vulnerability Note VU#551436

Mozilla Firefox SVG viewer vulnerable to integer overflow

Overview

The Mozilla SVG viewer contains an integer overflow vulnerability. This vulnerability may allow an attacker to execute arbitrary code, or create a denial-of-service condition.

I. Description

Scalable Vector Graphics (SVG) is an XML markup language for describing and displaying animated or static vector graphics. Mozilla Firefox includes a native SVG viewer, other Mozilla projects may use the Adobe SVG viewer.

The Mozilla SVG viewer fails to properly validate size parameters supplied to a memory allocation routine allowing an integer overflow to occur. This vulnerability could cause an undersized buffer to be allocated. When data is copied to that buffer, a heap-based buffer overflow may occur. An attacker may be able to exploit this vulnerability by convincing a user to go to a website that hosts a specially crafted SVG file.

This vulnerability occurred as a result of failing to comply with rule INT32-C of the CERT C Programming Language Secure Coding Standard.

II. Impact

A remote, unauthenticated attacker may be able to execute arbitrary code, or create a denial-of-service condition.

III. Solution

Upgrade

See Mozilla Foundation Security Advisory 2007-01 for information about affected clients.

Disable SVG

Until updates can be applied, disabling SVG in Mozilla Firefox may mitigate this vulnerability. See the Mozilla about:config guide for information on how to disable SVG.

Systems Affected

Vendor	Status	Date Updated
Mozilla	Vulnerable	25-Feb-2007

References

Credit

Mozilla credits Tom Ferris for reporting this vulnerability.

This document was written by Ryan Giobbi.

Other Information

Date Public	02/23/2007
Date First Published	02/25/2007 09:33:12 AM
Date Last Updated	07/13/2007
CERT Advisory
CVE Name	CVE-2007-0776
US-CERT Technical Alerts
Metric	22.23
Document Revision	68

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Produced 2007 by US-CERT, a government organization
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