Technical Description

Two vulnerabilities have been identified in Blender, which could be exploited by remote attackers to execute arbitrary commands or cause a denial of service.

The first flaw is due to an integer overflow error in the "get_bhead()" [readfile.c] function when processing malformed ".blend" files, which could be exploited by remote attackers to compromise an affected system by convincing a user to open a specially crafted "blend" file.

The second flaw is due to an input validation error in the "bvh_import.py" script that does not properly validate ".bvh" files before being passed to an "eval()" call, which could be exploited by attackers to execute arbitrary python code by convincing a user to import a malicious file.

Affected Products

Blender version 2.40pre and prior
Blender version 2.36 and prior

Solution

Upgrade to Blender version 2.41 :
http://www.blender3d.org/cms/Blender.31.0.html

References

http://www.vupen.com/english/advisories/2005/3032
http://www.frsirt.com/english/reference/3112

Credits

Vulnerabilities reported by Damian Put and Joxean Koret

ChangeLog

2005-12-21 : Initial release
2006-01-25 : Updated Solution
2006-04-24 : Additional vulnerability

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