EDB-ID: 42613 | Author: Dhiraj Mishra | Published: 2017-08-09 | CVE: CVE-2017-6328 | Type: Webapps | Platform: Multiple | Vulnerable App: N/A | # Date: August 9, 2017
# Software Link: https://www.symantec.com/products/messaging-gateway
# Exploit Author: Dhiraj Mishra
# Contact: http://twitter.com/mishradhiraj_
# Website: http://datarift.blogspot.in/
# CVE: CVE-2017-6328
# Category: Symantec Messaging Gateway
1. Description
The Symantec Messaging Gateway can encounter an issue of cross site request forgery (also known as one-click attack and is abbreviated as CSRF or XSRF), which is a type of malicious exploit of a website where unauthorized commands are transmitted from a user that the web application trusts. A CSRF attack attempts to exploit the trust that a specific website has in a user's browser.
2. Proof of concept
The SMG did not protect the logout form with csrf token, therefore i can logout any user by sending this url https://YourIPHere/brightmail/logout.do
Here's an attack vector:
1) Set up a honeypot that detects SMG scans/attacks (somehow).
2) Once I get a probe, fire back a logout request.
3) Continue to logout the active user forever.
It's less damaging than a traditional "hack back" but is sure to irritate the local red team to no end. It's essentially a user DoS.
3. Symantec Security Bulletin
https://www.symantec.com/security_response/securityupdates/detail.jsp?fid=security_advisory&pvid=security_advisory&year=&suid=20170810_00
