FortiGuard Advisory (FGA-2005-16)

Fortinet advises that its FortiGate security appliances, FortiManager systems, and FortiClient Host Security software products are vulnerable against the recent IKE ISAKMP (VU#226364) vulnerabilities. The recent IKE vulnerabilities were initially discovered by Oulu University in Finland's Secure Programming Group (OUSPG), which has developed a PROTOS ISAKMP Test Suite for IKEv1 Phase 1 and employed it to validate its findings against a number of products from different vendors. By applying the OUSPG PROTOS ISAKMP Test Suite to a variety of products, several vulnerabilities can be revealed that can have varying effects.

Products Affected:

Fortinet products confirmed to contain the similar flaws include FortiOS 2.50, 2.80 and 3.0; FortiClient 2.0; and FortiManager 2.80 and 3.0.

Impact on Fortinet Customers:

The impact of this vulnerability causes denial of service (DoS) of IPSec services. (Internal IKE process can crash due to failed range check of some IPSec attributes, but IKE will be restarted automatically by FortiOS.) Other services in FortiOS are not affected.

Risk:

High risk on FortiGate and FortiManager systems if IPSec VPN is required by the customer. No impact on customers that do not use IPSec services. Very low risk on FortiClient.

Workaround:

No workaround aside from not using IPSec services.

Solution:

Apply upgrade patches available from Fortinet Technical Support.

FortiGate products with version 3.0; apply patch with build 147 or higher.

FortiGate products with version 2.80; use MR12 once it becomes available or contact technical support for a special build.

FortiGate products with version 2.50; no patch available at this time.

FortiManager products with version 3.0; apply patch with build 189 or higher.

FortiManager products with version 2.80; no patch available at this time.

FortiClient products; no patch available at this time.

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.