FortiGuard Center

FortiGuard Advisory (FGA-2006-15)

Bypass Vulnerability in FortiGate FTP Antivirus scanning application
2006.May.10

Fortinet advises that a recently discovered FTP Anti-Virus Scanning application bypass vulnerability was found to exist under certain conditions. The Fortinet Engineering team has reviewed it and provided a fix for it.

Detailed description:
In a recent magazine article test review it was discovered that when using Enhanced Passive FTP (EPSV) on a client running SUSE Linux, the FTP anti-virus file scanning would be bypassed.

Fortinet's Analysis:
There is a bug discovered in the FortiGate FTP proxy when using EPSV. It is possible to break the FTP scanning proxy by enabling EPSV mode. Under these conditions an infected file may be allowed through the AV gateway. A temporary workaround would be to not use EPSV mode in FTP clients.

Products affected:
All FortiGate models running FTP Anti-Virus gateway scanning service.

Risk:
Medium to Low

Solution:
A fix has been provided in FortiOS 2.80 MR12 release, and in FortiOS 3.0 MR2 release.



Disclaimer:

Although Fortinet has attempted to provide accurate information in these materials, Fortinet assumes no legal responsibility for the accuracy or completeness of the information. More specific information is available on request from Fortinet. Please note that Fortinet's product information does not constitute or contain any guarantee, warranty or legally binding representation, unless expressly identified as such in a duly signed writing.

About Fortinet ( www.fortinet.com ):

Fortinet is the pioneer and leading provider of ASIC-accelerated unified threat management, or UTM, security systems, which are used by enterprises and service providers to increase their security while reducing total operating costs. Fortinet solutions were built from the ground up to integrate multiple levels of security protection--including firewall, antivirus, intrusion prevention, VPN, spyware prevention and anti-spam -- designed to help customers protect against network and content level threats. Leveraging a custom ASIC and unified interface, Fortinet solutions offer advanced security functionality that scales from remote office to chassis-based solutions with integrated management and reporting. Fortinet solutions have won multiple awards around the world and are the only security products that are certified in six programs by ICSA Labs: (Firewall, Antivirus, IPSec, SSL, Network IPS, and Anti-Spyware). Fortinet is privately held and based in Sunnyvale, California.