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Vulnerability Note VU#794752

Apple iChat AIM URI handler format string vulnerability

Overview

Apple iChat contains a format string vulnerability. This vulnerability may allow a remote, unauthenticated attacker to execute arbitary code.

I. Description

The Apple iChat AIM URI handler fails to properly sanitize user-controlled data that is supplied to a formatted output function. This may allow a format string vulnerability to occur.

Depending on the user's browser, an attacker may be able to exploit this vulnerability by persuading a user to access a specially crafted web page. Some web browsers, such as Safari, automatically launch iChat to handle certain types of URIs. So, if a Safari user accesses a web page containing a specially crafted URI, iChat will be launched to process that URI. This may trigger the vulnerability.

II. Impact

A remote, unauthenticated attacker may be able to execute arbitrary code.

III. Solution

Apply an update

Apple has addressed this issue with Apple Security Update 2007-002.

Systems Affected

VendorStatusDate NotifiedDate Updated
Apple Computer, Inc.Vulnerable16-Feb-2007

References

https://www.securecoding.cert.org/confluence/x/WwE
http://www.us-cert.gov/reading_room/securing_browser/
http://projects.info-pull.com/moab/MOAB-20-01-2007.html
http://docs.info.apple.com/article.html?artnum=305102
http://secunia.com/advisories/24198/
http://securitytracker.com/alerts/2007/Feb/1017661.html
http://www.securityfocus.com/bid/22146

Credit

This vulnerability was publicly disclosed as part of the Month of Apple Bugs project.

This document was written by Jeff Gennari.

Other Information

Date Public:2007-01-20
Date First Published:2007-02-16
Date Last Updated:2007-03-05
CERT Advisory: 
CVE-ID(s):CVE-2007-0021
NVD-ID(s):CVE-2007-0021
US-CERT Technical Alerts: 
Metric:11.85
Document Revision:25

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