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Apple iChat AIM URI handler format string vulnerability

Vulnerability Note VU#794752

Original Release Date: 2007-02-16 | Last Revised: 2007-03-05


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


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.


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


Apply an update

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

Vendor Information


Apple Computer, Inc. Affected

Updated:  February 16, 2007



Vendor Statement

We have not received a statement from the vendor.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.


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

This document was written by Jeff Gennari.

Other Information

CVE IDs: CVE-2007-0021
Severity Metric: 11.85
Date Public: 2007-01-20
Date First Published: 2007-02-16
Date Last Updated: 2007-03-05 17:01 UTC
Document Revision: 25

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