Vulnerability Note VU#214040

Apple Mac OS X fails to properly handle corrupted UDTO HFS+ image structures

Overview

Apple Mac OS X fails to properly handle corrupted UDTO HFS+ image structures. This vulnerability may allow an attacker to cause a denial-of-service condition.

I. Description

Hierarchical File System (HFS+) is a file system that supports files that use 32-bit block addresses and Unicode file and folder naming conventions. UDTO is a format specification used to create DVD/CD-R master disk images. A vulnerability exists in the way Mac OS X handles corrupted UDTO HFS+ image structures. This vulnerability could lead to memory corruption.

We are aware of publicly available proof-of-concept code that demonstrates this vulnerability.

II. Impact

A remote, unauthenticated attacker may be able to cause a denial-of-service condition.

III. Solution

Apply an upgrade

Apple has issued an upgrade to address this issue. See Apple Security Update 2007-003 for more details.

Disable the "Open 'safe' files after downloading" option

For instructions on how to disable the "Open 'safe' files after downloading" option in Safari, please refer to the Safari section of the Securing Your Web Browser document.

Do not access DMG files from untrusted sources

Do not download DMG files from unknown or untrusted sources. Do not open unfamiliar or unexpected links, particularly those delivered in email messages. Please see Cyber Security Tip ST04-014 .

Systems Affected

Vendor	Status	Date Updated
Apple Computer, Inc.	Vulnerable	13-Mar-2007

References

http://projects.info-pull.com/mokb/MOKB-21-11-2006.html
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-6062
http://secunia.com/advisories/23062/
http://docs.info.apple.com/article.html?artnum=305214
http://en.wikipedia.org/wiki/HFS_Plus
http://secunia.com/advisories/24479/
http://securitytracker.com/alerts/2007/Mar/1017751.html
http://www.securityfocus.com/bid/21236
http://www.securityfocus.com/bid/21201

Credit

This issue was reported in Month of Kernal Bugs MOKB-21-11-2006 by LMH.

This document was written by Chris Taschner.

Other Information

Date Public	11/21/2006
Date First Published	03/13/2007 05:40:23 PM
Date Last Updated	03/22/2007
CERT Advisory
CVE Name	CVE-2006-6062
US-CERT Technical Alerts
Metric	5.57
Document Revision	25

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Produced 2007 by US-CERT, a government organization
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