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TITLE:
phpBB "avatar_path" PHP Code Execution Vulnerability

SECUNIA ADVISORY ID:
SA22188

VERIFY ADVISORY:
http://secunia.com/advisories/22188/

CRITICAL:
Less critical

IMPACT:
System access

WHERE:
>From remote

SOFTWARE:
phpBB 2.x
http://secunia.com/product/463/

DESCRIPTION:
ShAnKaR has discovered a vulnerability in phpBB, which can be
exploited by malicious users to compromise a vulnerable system.

Input passed to the "avatar_path" parameter in admin/admin_board.php
is not properly sanitised before being used as a configuration
variable to store avatar images. This can be exploited to upload and
execute arbitrary PHP code by changing "avatar_path" to a file with a
trailing NULL byte.

Successful exploitation requires privileges to the administration
section.

The vulnerability has been confirmed in version 2.0.21. Other
versions may also be affected.

SOLUTION:
Grant only trusted users access to the administration section.

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

PROVIDED AND/OR DISCOVERED BY:
ShAnKaR

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