FortiGuard Advisory (FGA-2005-15)

Arbitrary Code Execution Vulnerability in Microsoft Internet Explorer
2005.November.22

Fortinet advises that its FortiGate security appliances protect against the latest Microsoft Internet Explorer "window()" Arbitrary Code Execution Vulnerability (CVE-2005-1790), a critical vulnerability that has been identified in Microsoft Internet Explorer, which could be exploited by remote attackers to execute arbitrary commands. A reclassification for the Microsoft Internet Explorer JavaScript Window() DoS vulnerability originally reported on 5/31/2005, it now indicates that the vulnerability can be exploited by malicious attackers to compromise a user's system.

Internet Explorer can not handle specially crafted calls to JavaScript "window()" objects and "body onload" tags. So leveraging this vulnerability, a malicious attacker could construct an HTML page that when viewed by a user could cause the execution of the arbitrary code.

To protect against Microsoft Internet Explorer "window()" Arbitrary Code Execution Vulnerability (CVE-2005-1790), Fortinet created an intrusion prevention signature that covers the vulnerability. A description for Fortinet's intrusion prevention signature is as follows:

IE.JSWindow.Bodyonload.Tag.Code.Execution:
http://www.fortinet.com/ids/ID103022666
Microsoft's related security advisory:
http://www.microsoft.com/technet/security/advisory/911302.mspx
Secunia marked this threat as "extremely critical" and more information on Secunia's related advisory can be found here: http://secunia.com/advisories/15546/

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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.