Check Point Advisories

Serv-U FTP Server Command Buffer Overflow (CVE-2004-2111)

Vulnerability
Protection

Check Point Reference:	CPAI-2004-107
Date Published:	5 Nov 2009
Severity:	Medium
Last Updated:	Thursday 05 November, 2009
Source:
Industry Reference:	CVE-2004-2111
Protection Provided by:	Security Gateway R81, R80, R77, R75
Who is Vulnerable?
Vulnerability Description	Serv-U FTP Server is a widely-used FTP server that includes enterprise-grade features such as SSL support, ODBC and Windows NT/SAM user account management, virtual directories, compression etc. By default configuration, Serv-U FTP Server listens on 21/TCP for incoming FTP request. There exists a vulnerability in the Serv-U FTP server prior to version 4.2, in the processing of the FTP "SITE CHMOD" command. Due to insufficient boundary checks on the input parameter, an attacker can create a buffer overflow. In an attack case where code injection was successful, the behaviour of the target is dependent on the nature of the injected code. One of the options being the attacker gaining control over the vulnerable Windows system. In an attack case where code injection was not successful, Serv-U FTP service will terminate abnormally.

Protection Overview

This protection will detect and block attempts to exploit this vulnerability

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 R80 / R77 / R75

In the IPS tab, click Protections and find the Serv-U FTP Server Command Buffer Overflow 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: Serv-U FTP server command buffer overflow