cPanel WHM v11.32.4 b9 - Persistent Web Vulnerability

Document Title:
===============
cPanel WHM v11.32.4 b9 - Persistent Web Vulnerability


References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=665


Release Date:
=============
2012-07-15


Vulnerability Laboratory ID (VL-ID):
====================================
665


Common Vulnerability Scoring System:
====================================
2.2


Product & Service Introduction:
===============================
WebHost Manager (WHM) is a web-based tool used by server administrators and resellers to manage hosting 
accounts on a web server. WHM listens on ports 2086 and 2087 by default. As well as being accessible by 
the root administrator, WHM is also accessible to users with reseller privileges. Reseller users of cPanel 
have a smaller set of features than the root user, generally limited by the server administrator, to 
features which they determine will affect their customers\\\\\\\' accounts rather than the server as a whole. 
From WHM, the server administrator can perform maintenance operations such as compile Apache and upgrade 
RPMs installed on the system.

(Copy of the Homepage: http://en.wikipedia.org/wiki/CPanel#WHM_.28Web_Host_Manager.29 )


Abstract Advisory Information:
==============================
Vulnerability-Lab Team discovered a persistent Web Vulnerability in the cPanel Web Host Manager (WHM) v11.32.4 b9.


Vulnerability Disclosure Timeline:
==================================
2012-07-16:	Public or Non-Public Disclosure


Discovery Status:
=================
Published


Exploitation Technique:
=======================
Local


Severity Level:
===============
Low


Technical Details & Description:
================================
Multiple persistent input validation vulnerabilities are detected in the cPanel Web Host Manager (WHM) v11.32.4 b9.
The bug allows an attackers to implement/inject malicious script code on the application-side (persistent). 
The persistent vulnerability is located in the activate_remote_nameservers.cgi (cPanel DNS Remote Configuration) file 
with the bound vulnerable listing. The bug can be exploit through the Remote server username & Remote cPanel WHM DNS 
Host input fields. Successful exploitation of the vulnerability can lead to persistent session hijacking (manager/admin) 
or stable (persistent) context manipulation. Exploitation requires low user inter action but a privileged user account. 


Vulnerable Section(s):
                          [+] cPanel DNS Remote Configuration  (Exception Handling)

Vulnerable File(s):
                          [+] activate_remote_nameservers.cgi

Vulnerable Input(s):
                          [+] Remote cPanel & WHM DNS Host
                          [+] Remote Server Username

Vulnerable Parameter(s):
                          [+] errormsg


Proof of Concept (PoC):
=======================
The persistent input validation vulnerability can be exploited by privileged user account with low required user inter action.
For demonstration or reproduce ...

Review:  activate_remote_nameservers.cgi

<div id="breadcrumbs" class="hideBreadcrumbs">
<p> <a href="http://demo.127.0.0.1:2086/scripts/command?PFILE=main">Main</a>
 >> <a href="http://demo.127.0.0.1:2086/scripts/command?PFILE=Cluster_Remote_Access">
Cluster/Remote Access</a> >> <a href="http://demo.127.0.0.1.net:2086/cgi/clusterstatus.cgi">Configure Cluster</a></p>
 </div>
<div id="doctitle">
<h1><span><img src="activate_remote_nameservers.cgi-Dateien/configure_cluster.gif" alt=""></span> Cluster Management</h1>
</div>
</div>
<div class="topboxmargin"></div><div class="errormsg">
DNS Lookup Failed for "><iframe src="activate_remote_nameservers.cgi-[PERSISTENT INJECTED SCRIPT CODE])' <<="" div=""><br><b></b>
<div align="center"><br /><a href="clusterstatus.cgi">Return to Cluster Status</a></div></iframe></div></body></html>


Solution - Fix & Patch:
=======================
The vulnerability can be patched by parsing the remote cPanel DNS configuration module exception handling & listing.
Parse and restrict also the Remote cPanel WHM DNS host & Remote server username input fields.


Security Risk:
==============
The security risk of the persistent input validation vulnerability is estimated as medium(-).


Credits & Authors:
==================
Vulnerability Laboratory [Research Team]  -    N/A  Anonymous ([email protected])


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=========================
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