TITLE:
MyBulletinBoard Multiple Vulnerabilities

SECUNIA ADVISORY ID:
SA17577

VERIFY ADVISORY:
http://secunia.com/advisories/17577/

CRITICAL:
Moderately critical

IMPACT:
Cross Site Scripting, Manipulation of data, DoS

WHERE:
>From remote

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

DESCRIPTION:
syini666 has reported some vulnerabilities in MyBulletinBoard, which
can be exploited by malicious people to cause a DoS (Denial of
Service), manipulate certain information, and conduct script
insertion attacks.

1) Input passed to the subject field when creating a new thread isn't
properly sanitised before being used. This can be exploited to inject
arbitrary HTML and script code, which will be executed in a user's
browser session in context of an affected site when the malicious
user data is viewed in the main page.

2) Some input passed in the Reputation system isn't properly
sanitised before being used. This can be exploited to inject
arbitrary HTML and script code, which will be executed in a user's
browser session in context of an affected site when the malicious
user data is viewed in the user configuration panel.

3) The problem is that users can delete or move other users' private
messages (PM).

Successful exploitation requires knowledge of the ID number.

4) An unspecified error can be exploited to cause a Denial of Service
on a vulnerable server.

SOLUTION:
2, 4) Update to MyBB PR2 (Revision 686 updated 2005-11-01).
http://www.mybboard.net/mybb_pr2_20051101.zip

1, 3) Edit the source code to ensure that input is properly sanitised
and verified.

PROVIDED AND/OR DISCOVERED BY:
1-3) syini666
4) Reported by vendor.

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