bugtraq - [KIS-2014-05] Dotclear <= 2.6.2 (XML-RPC Interface) Authentication Bypass Vulnerability

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Message-ID: <537CF86F.8090007@karmainsecurity.com>
Date: Wed, 21 May 2014 21:03:11 +0200
From: Egidio Romano <research@...mainsecurity.com>
To: bugtraq@...urityfocus.com, fulldisclosure@...lists.org
Subject: [KIS-2014-05] Dotclear <= 2.6.2 (XML-RPC Interface) Authentication
 Bypass Vulnerability

-------------------------------------------------------------------------
Dotclear <= 2.6.2 (XML-RPC Interface) Authentication Bypass Vulnerability
-------------------------------------------------------------------------

[-] Software Link:

http://dotclear.org/

[-] Affected Versions:

Version 2.6.2 and probably prior versions.

[-] Vulnerability Description:

The vulnerable code is located in the dcXmlRpc::setUser() method
(inc/core/class.dc.xmlrpc.php):

262.		/* Internal methods
263.		--------------------------------------------------- */
264.		private function setUser($user_id,$pwd)
265.		{
266.			if ($this->core->auth->userID() == $user_id) {
267.				return true;
268.			}
269.	
270.			if ($this->core->auth->checkUser($user_id,$pwd) !== true) {
271.				throw new Exception('Login error');
272.			}
273.	
274.			return true;

The vulnerability exists because of the method not properly verifying
the provided password
before being used in a call to the dcAuth::checkUser() method at line
270. This could be exploited
to bypass the authentication mechanism by sending an XML-RPC request
with a valid username and an
empty password. Successful exploitation of this vulnerability requires
the XML-RPC interface to
be enabled (disabled by default).

[-] Solution:

Update to version 2.6.3.

[-] Disclosure Timeline:

[14/05/2014] - Vendor notified
[15/05/2014] - Vendor response
[16/05/2014] - Version 2.6.3 released:
http://dotclear.org/blog/post/2014/05/16/Dotclear-2.6.3
[16/05/2014] - CVE number requested
[19/05/2014] - CVE number assigned
[21/05/2014] - Public disclosure

[-] CVE Reference:

The Common Vulnerabilities and Exposures project (cve.mitre.org)
has assigned the name CVE-2014-3781 to this vulnerability.

[-] Credits:

Vulnerability discovered by Egidio Romano.

[-] Original Advisory:

http://karmainsecurity.com/KIS-2014-05