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TITLE:
MyBB "domecode()" PHP Code Execution Vulnerability

SECUNIA ADVISORY ID:
SA20371

VERIFY ADVISORY:
http://secunia.com/advisories/20371/

CRITICAL:
Highly critical

IMPACT:
System access

WHERE:
>From remote

SOFTWARE:
MyBB (formerly MyBulletinBoard) 1.x
http://secunia.com/product/4479/

DESCRIPTION:
Secunia Research has discovered a vulnerability in MyBB, which can be
exploited by malicious people to compromise a vulnerable system.

Input passed to the username field when registering isn't properly
sanitised before being used in a "preg_replace" call with the "e"
modifier in the "domecode()" function in inc/functions_post.php. This
can be exploited to execute arbitrary PHP code by first registering
with a specially crafted username and then previewing a post
containing the "/slap" string.

The vulnerability has been confirmed in version 1.1.2. Prior versions
may also be affected.

SOLUTION:
Update to version 1.1.3.
http://www.mybboard.com/downloads.php

PROVIDED AND/OR DISCOVERED BY:
Andreas Sandblad, Secunia Research

ORIGINAL ADVISORY:
Secunia Research:
http://secunia.com/secunia_research/2006-40/advisory/

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About:
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