Some vulnerabilities have been reported in Apple QuickTime, which can be exploited by malicious people to compromise a user's system.

1) A boundary error when parsing packed scanlines from a PixData structure in a PICT file can be exploited to cause a heap-based buffer overflow via a specially crafted PICT file.

2) An error in the processing of AAC-encoded media content can be exploited to cause a memory corruption via a specially crafted media file.

3) A boundary error in the processing of PICT files can be exploited to cause a heap-based buffer overflow via a specially crafted PICT file.

4) A boundary error in the processing of Indeo video codec content can be exploited to cause a stack-based buffer overflow via a specially crafted movie file with Indeo video codec content.

5) An error in the handling of "file:" URLs can be exploited to e.g. execute arbitrary programs when playing specially crafted QuickTIme content in QuickTime Player.

6) An sign-extension error in the processing of PICT files can be exploited to cause a heap-based buffer overflow via a specially crafted PICT file.

Successful exploitation of these vulnerabilities may allow execution of arbitrary code.

Solution
Update to version 7.5 (via Software Update or Apple Downloads. See vendor's advisory for details).

Provided and/or discovered by
1) Dyon Balding, Secunia Research
2) Independently discovered by:
* Dave Soldera, NGS Software
* Jens Alfke
3) Liam O Murchu, Symantec
4) An anonymous researcher, reported via ZDI
5) Independently discovered by:
* Vinoo Thomas and Rahul Mohandas, McAfee Avert Labs
* Petko D. (pdp) Petkov, GNUCITIZEN
6) Sergio 'shadown' Alvarez of n.runs AG

Changelog
Further details available to Secunia VIM customers

Original Advisory
Apple:
http://support.apple.com/kb/HT1991

Secunia Research:
http://secunia.com/secunia_research/2008-9/

ZDI:
http://www.zerodayinitiative.com/advisories/ZDI-08-037/
http://www.zerodayinitiative.com/advisories/ZDI-08-038/

n.runs AG:
http://www.nruns.com/security_advisory_quicktime_arbitrary_code_execution.php

GNUCITIZEN:
http://www.gnucitizen.org/blog/details-of-the-quicktime-vulnerability/

Other references
Further details available to Secunia VIM customers

Deep Links
Links available to Secunia VIM customers