Check Point Advisories

Serv-U FTP Server Timezone MDTM Buffer Overflow (CVE-2004-0330)

Vulnerability
Protection

Check Point Reference:	CPAI-2004-121
Date Published:	8 Nov 2009
Severity:	High
Last Updated:	Sunday 08 November, 2009
Source:
Industry Reference:	CVE-2004-0330
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 Serv-U FTP server, versions 5.0.0.4 and prior, in its handling of malformed FTP MDTM requests. The MDTM command is a non-standard command (therefore, not RFC compliant) used within FTP conversations. The MDTM command allows a client to query the server about the 'Modification Date and Time' of a file or directory that is present on the remote server. Serv-U FTP server does not correctly validate input when an FTP MDTM command is run. As a result, an attacker can gain system privileges on the remote server. In an attack case where code injection was not successful, the remote Serv-U FTP server will terminate abnormally. In an attack case where code injection was successful, the behaviour of the target is dependent on the nature of the injected code. This context in which this code will run, in the default configuration, is LOCAL_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 Serv-U FTP Server Timezone MDTM 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 Timezone MDTM buffer overflow