TITLE:
Snitz Forums Avatar Mod Module Avatar Upload Vulnerability

SECUNIA ADVISORY ID:
SA20148

VERIFY ADVISORY:
http://secunia.com/advisories/20148/

CRITICAL:
Moderately critical

IMPACT:
System access

WHERE:
>From remote

SOFTWARE:
Avatar Mod 1.x (module for Snitz Forums)
http://secunia.com/product/10020/

DESCRIPTION:
Paul Craig has reported a vulnerability in the Avatar Mod module for
Snitz Forums, which can be exploited by malicious users to compromise
a vulnerable system.

The vulnerability is caused due to an input validation error in the
handling of avatar uploads in avatar_upload.asp. This can be
exploited to upload scripts to a location inside the web root by
including a null byte in the avatar filename.

Example:
test.asp[null byte].jpg

Successful exploitation requires administrative privileges.

The vulnerability has been reported in version 1.3. Other versions
may also be affected.

SOLUTION:
Edit the source code to ensure that input is properly sanitised.

PROVIDED AND/OR DISCOVERED BY:
Paul Craig

ORIGINAL ADVISORY:
http://lists.grok.org.uk/pipermail/full-disclosure/2006-May/046115.html

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