Check Point Advisories

Non-SSH Traffic Over Port 22

Vulnerability
Protection

Check Point Reference:	CPAI-2012-074
Date Published:	27 Feb 2012
Severity:	N/A
Last Updated:	Monday 24 March, 2014
Source:
Protection Provided by:	Security Gateway R77, R75, R71, R70
Who is Vulnerable?
Vulnerability Description	TCP Port 22 is normally used to transfer SSH traffic. Non-SSH traffic over this port may be used for malicious purposes. Many applications scan for open SSH ports for malicious purposes. Non-SSH traffic over port 22 may indicate an attempt to pass malicious traffic to or outside the network. There are cases in which certain traffic, although not intended for malicious use, is very unsafe, since it may transfer shellcode which is undetectable by IPS.

Protection Overview

This protection will detect and block non-SSH traffic over port 22. The protection may be configured to detect and block SSL traffic over port 22.

In order for the protection to be activated, update your Security Gateway product to the latest IPS update. For information on how to update IPS, go to SBP-2006-05, click on Protection tab and select the version of your choice.

Security Gateway R77 / R75 / R71 / R70

In the IPS tab, click Protections and find the Non-SSH Traffic Over Port 22 protection using the Search tool and Edit the protection's settings.
Install policy on all Security Gateways.

This protection's log will contain the following information:

Attack Name: SSH Protection Violation.
Attack Information: Non-SSH traffic over port 22