FortiGuard Advisory (FGA-2006-09)
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Application Bypass Vulnerability in FortiGate FTP Antivirus Scanning 2006.February.24 Fortinet advises that a recently discovered FTP Anti-Virus Scanning application bypass vulnerability was found and published on some public websites. The Fortinet Engineering team has reviewed it and provided a fix for it. (CVE Reference: CAN-2005-3058) Original public website description: "Fortinet's virus scanning functionality can be bypassed when sending files over FTP under certain conditions." Fortinet's Analysis: There is a bug discovered in the FortiGate FTP proxy if LFTP is used as an FTP client (comes with RedHat Fedora Core). It is possible to break the FTP protocol proxy by not waiting for a response to a STOR command before proceeding with uploading a file. In theory, a server could reject the STOR command, and the LFTP client can attempt to upload the file, wasting bandwidth, and possibly exploiting a vulnerability of the FTP server. Products affected: All FortiGate models running FTP Anti-Virus scanning service. Risk: 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. |