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TITLE:
Xoops Avatar Upload File Extension Vulnerability

SECUNIA ADVISORY ID:
SA14520

VERIFY ADVISORY:
http://secunia.com/advisories/14520/

CRITICAL:
Moderately critical

IMPACT:
System access

WHERE:
>From remote

SOFTWARE:
Xoops 2.x
http://secunia.com/product/327/

DESCRIPTION:
pokleyzz has reported a vulnerability in Xoops, which potentially can
be exploited by malicious users to compromise a vulnerable system.

The vulnerability is caused due to an input validation error in the
uploading of custom avatars in "uploader.php". This can be exploited
to upload valid image files with arbitrary file extensions (except
".php", ".cgi", ".pl", ".py", and ".asp").

Successful exploitation may allow execution of malicious scripts
(e.g.  PHP scripts with the ".php3" file extension), but requires
that "Allow Custom Avatar Upload" is enabled (not default setting).

The vulnerability has been reported in version 2.0.9.2 and prior.

SOLUTION:
The vendor recommends administrators to turn off support for custom
avatar uploads in:
System Admin -> Preferences -> User Info Settings -> "Allow Custom
Avatar Upload"

The vendor also recommends not allowing non trusted users to upload
images through the image manager:
Administration Menu -> System Admin -> Images

Apply patches (see original advisory).

PROVIDED AND/OR DISCOVERED BY:
pokleyzz, SCAN Associates

ORIGINAL ADVISORY:
http://www.xoops.org/modules/news/article.php?storyid=2114

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