Check Point Advisories

Ipswitch WS_FTP Server Commands Buffer Overflow Denial of Service (CVE-2004-1135)

Vulnerability
Protection

Check Point Reference:	CPAI-2004-202
Date Published:	30 Nov 2009
Severity:	High
Last Updated:	Monday 30 November, 2009
Source:
Industry Reference:	CVE-2004-1135
Protection Provided by:	Security Gateway R81, R80, R77, R75
Who is Vulnerable?
Vulnerability Description	The Ipswitch WS_FTP server is a full featured secure FTP server complete with several optional authentication mechanisms, encryption and data access controls. It is fully compliant with the File Transfer Protocol specifications. A vulnerability exists in the way Ipswitch WS_FTP server parses certain FTP commands. Specially crafted arguments to certain FTP commands can trigger a buffer overflow. An attacker can exploit this vulnerability to create a denial of service condition or execute arbitrary code with system level privileges. In a simple attack, the attacker can terminate the WS_FTP server. Since the product is a multi-threaded application and does not spawn child processes for connections, this will terminate all active FTP connections. In the default Windows configuration, the server does not restart after failures. Therefore, the FTP service will be unavailable until an administrator restarts the service. In a sophisticated attack, an attacker can inject code into the vulnerable target. The behaviour of the target is dependent on the malicious code. Note that any code executed by the attacker runs with the privileges of the WS_FTP server which is SYSTEM.

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 Ipswitch WS_FTP Server Commands Buffer Overflow Denial of Service 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: Ipswitch WS_FTP Server commands buffer overflow denial of service