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TITLE:
MyBB Multiple Vulnerabilities

SECUNIA ADVISORY ID:
SA32451

VERIFY ADVISORY:
http://secunia.com/advisories/32451/

CRITICAL:
Moderately critical

IMPACT:
Unknown, Cross Site Scripting, Brute force, Exposure of sensitive
information

WHERE:
>From remote

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

DESCRIPTION:
Some vulnerabilities and a weakness have been reported in MyBB, where
some have an unknown impact, and others can be exploited by malicious
people to conduct brute force or cross-site scripting attacks.

1) Input passed to the "url" parameter in moderation.php (when
"action" is set to "removesubscriptions" and "ajax" to "1") is not
properly sanitised before being returned to the user. This can be
exploited to execute arbitrary HTML and script code in a user's
browser session in context of an affected site.

Successful exploitation of this vulnerability requires that the
victim has valid moderator or administrator credentials.

2) The problem is caused due to storing attachments with filenames
based on the user ID and the timestamp, making them vulnerable to
brute force attacks. This can be exploited to disclose sensitive
information without valid user credentials.

3) Some vulnerabilities are caused due to unknown errors. No further
information is currently available.

The vulnerabilities and the weakness are reported in all versions
prior to 1.4.3 downloaded on 2008-10-29 or later.

SOLUTION:
Update to version 1.4.3 downloaded on 2008-10-29 or later.

PROVIDED AND/OR DISCOVERED BY:
1, 2) Kellanved, NeoThermic, and Techie-Micheal
3) Reported by the vendor.

ORIGINAL ADVISORY:
MyBB:
http://community.mybboard.net/thread-39705.html

Kellanved, NeoThermic, and Techie-Micheal:
http://lists.grok.org.uk/pipermail/full-disclosure/2008-October/065280.html

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