XennoBB <= 2.2.1 "icon_topic" SQL Injection

--------------------- SUMMARY ---------------------

Name:

XennoBB "icon_topic" SQL Injection (19/8/2006)

Vendor / Product:

XennoBB Group

http://www.xennobb.com/

Description:

The world's most revolutionary and easy to use bulletin board.

Revolutionary because it redefines the boundaries of usability

and power; from the first version it's a real alternative to

the commercial forums out there.

How can XennoBB be described in few words?

Lightning-speed, stable, SECURED(?) and modern.

Version(s) Affected:

All current (<= 2.2.1 at the time of the release)

Severity:

High

Impact:

SQL Injection (Remote)

Status:

Unpatched

Discovered by:

Chris Boulton <http://www.surfionline.com>

Original advisory:

http://www.surfionline.com/security_advisories/20060819_xennobb_icon_top
ic_sql.txt

------------------- DESCRIPTION -------------------

An exploit exists in the above mentioned versions of XennoBB which

can be exploited by malicious users to conduct SQL injection attacks.

Input passed to the "icon_topic" parameter in topic_post.php is not

properly sanitised before being used in an SQL query. This exploit

can lead to manipulation of SQL queries by injecting arbitary SQL code.

--------------------- EXPLOIT ---------------------

Submit a forged POST request to

topic_post.php?action=post&fid={forum ID here}

With the following as the POST data:

form_sent=1&form_user={username here}&req_subject=Subject&req_message=Message&submit=1&icon_topic=[SQL]

Successful exploitation leads would lead to the SQL query in the icon_topic

parameter being run.

--------------------- SOLUTION --------------------

Ensure input is properly sanitized before being used in a database

query.

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