Check Point Advisories

Non-FTP Traffic Over Port 20/21

Vulnerability
Protection

Check Point Reference:	CPAI-2012-073
Date Published:	27 Feb 2012
Severity:	N/A
Last Updated:	Tuesday 27 December, 2016
Source:
Protection Provided by:	Security Gateway R77, R75, R71, R70
Who is Vulnerable?
Vulnerability Description	TCP Port 20/21 is normally used to transfer FTP traffic. Non-FTP traffic over this port may be used for malicious purposes. Many applications scan for open FTP ports for malicious purposes. Non-FTP traffic over port 20/21 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-FTP traffic over port 20/21.

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-FTP Traffic Over Port 20/21 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: FTP Enforcement Violation.
Attack Information: Non-FTP Traffic Over Port 20/21