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Apple QuickTime PictureViewer PICT data decompression buffer overflow

Vulnerability Note VU#855118

Original Release Date: 2005-11-08 | Last Revised: 2005-11-08


Apple QuickTime PictureViewer contains a buffer overflow that may allow a remote attacker to execute arbitrary code on a vulnerable system.


Apple's QuickTime Player is multimedia software that allows users to view local and remote audio/video content. PictureViewer is a QuickTime component used to view still images. A lack of input validation in Apple QuickTime PictureViewer may allow a buffer overflow to occur. The overflow occurs because PictureViewer does not properly validate the size of compressed PICT data. When PictureViewer decompresses the PICT data, that data is copied to a buffer of insufficient size resulting in a buffer overflow.

For more information, please see Apple Security Update for QuickTime.


A remote attacker may be able to execute arbitrary code if they can persuade a user to access a specially crafted compressed PICT file.


Apply update
This issue is addressed in QuickTime version 7.0.3.

Do not access PICT files from untrusted sources

Exploitation occurs by accessing a specially crafted PICT file (typically .pct). By only accessing PICT files from trusted or known sources, the chances of exploitation are reduced.

Attackers may host malicious PICT files on a website. In order to convince users to visit their sites, those attackers often use URL encoding, IP address variations, long URLs, intentional misspellings, and other techniques to create misleading links. Do not click on unsolicited links received in email, instant messages, web forums, or internet relay chat (IRC) channels. Type URLs directly into the browser to avoid these misleading links. While these are generally good security practices, following these behaviors will not prevent exploitation of this vulnerability in all cases, particularly if a trusted site has been compromised or allows cross-site scripting.

Vendor Information


Apple Computer, Inc. Affected

Updated:  November 07, 2005



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 reported by Apple Product Security. Apple credits Piotr Bania with providing information regarding this issue.

This document was written by Jeff Gennari.

Other Information

CVE IDs: CVE-2005-2756
Severity Metric: 8.61
Date Public: 2005-11-04
Date First Published: 2005-11-08
Date Last Updated: 2005-11-08 14:11 UTC
Document Revision: 23

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