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Vulnerability Note VU#552136

Apple Mac OS X UFS filesystem integer overflow vulnerability

Overview

There is an integer overflow in the ffs_mountfs() function, which is used by Apple's OS X operating system to handle UFS disc images.

I. Description

Unix File System (UFS) is a file system used by Unix and other similar operating systems. Apple OS X supports UFS, partitions, and images.

There is an integer overflow error in the ffs_mountfs() function that may occur when an OS X system opens a UFS disc image. To trigger the overflow, an attacker would need to convince a user to open a specially crafted disc image. Note that the Safari web browser's default settings consider UFS disc images to be a safe file type, and will automatically open them after downloading.

II. Impact

A remote, unauthenticated attacker with the ability to supply a specially crafted DMG file may be able to cause an affected system to crash, thereby creating a denial of service. The original reporter states that an attacker may also be able to execute arbitrary code using this vulnerability. However, this has not been confirmed.

III. Solution

Upgrade

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

Disable "Open 'safe' files after downloading"

Disable the option "Open 'safe' files after downloading," as specified in the Securing Your Web Browser document. This will help prevent automatic exploitation of this and other vulnerabilities.

Systems Affected

VendorStatusDate Updated
Apple Computer, Inc.Vulnerable13-Mar-2007

References


http://projects.info-pull.com/moab/MOAB-10-01-2007.html
http://secunia.com/advisories/23703/
http://applefun.blogspot.com/index.html
http://en.wikipedia.org/wiki/Unix_File_System
http://docs.info.apple.com/article.html?artnum=301191
http://www.securityfocus.com/bid/21993
http://docs.info.apple.com/article.html?artnum=305214

Credit

This issue was reported by LMH on the month of Apple bugs website.

This document was written by Ryan Giobbi.

Other Information

Date Public01/10/2007
Date First Published01/16/2007 02:49:42 PM
Date Last Updated03/13/2007
CERT Advisory 
CVE-ID(s)CVE-2006-5679
NVD-ID(s)CVE-2006-5679
US-CERT Technical Alerts 
Metric1.14
Document Revision19

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