FortiGuard Advisory (FGA-2006-10)
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Bypass Vulnerability in FortiGate URL Filtering Application 2006.February.24 Fortinet advises that a recently discovered URL Filtering 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-2005-3057) Original public website description: "Fortinet's URL blocking functionality can be bypassed by specially-crafted HTTP requests that are terminated by the CR character instead of the CRLF characters. It is also possible to bypass the functionality via a HTTP/1.0 request with no host header." Fortinet's Analysis: The author's original description is actually inaccurate. A more accurate description is: "....HTTP requests that are terminated by LR character instead of CRLF characters..." as analysis of the author's PERL script showed. Moreover, while it is possible "to bypass the functionality via an HTTP/1.0 request with no host header", the use of a host field is actually required to access a specific site on multi-homed web sites. When no host header is used, the intended web site is actually not displayed. Therefore, there is no risk. Products affected: All FortiGate models running FortiGuard Web Filtering services. 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. |