Mozilla Firefox 3 URI Launching and XUL Error Page Vulnerabilities

Secunia ID	SA31106
CVE-ID	CVE-2008-2933, CVE-2008-3198
Release Date	16 Jul 2008
Last Change	28 Jul 2008
Criticality	Highly Critical Typically used for remotely exploitable vulnerabilities that can lead to system compromise. Successful exploitation does not normally require any interaction but there are no known exploits available at the time of disclosure. Such vulnerabilities can exist in services like FTP, HTTP, and SMTP or in client systems like email programs or browsers.
Solution Status	Vendor Patch
Software	Mozilla Firefox 3.0.x
Where	From remote "From remote" describes other vulnerabilities where the attack vector doesn't require access to the system or a local network. This category covers services that are acceptable to expose to the Internet (e.g. HTTP, HTTPS, SMTP). It also covers client applications used on the Internet and certain vulnerabilities where it is reasonable to assume that a security conscious user can be tricked into performing certain actions.
Impact	System access This covers vulnerabilities where malicious people are able to gain system access and execute arbitrary code with the privileges of a local user. Security Bypass This covers vulnerabilities or security issues where malicious users or people can bypass certain security mechanisms of the application. The actual impact varies significantly depending on the design and purpose of the affected application. Spoofing This covers various vulnerabilities where it is possible for malicious users or people to impersonate other users or systems.
Description	Some vulnerabilities have been reported in Firefox 3, which can be exploited by malicious people to bypass certain security restrictions, potentially conduct spoofing attacks, or compromise a user's system. 1) A vulnerability can be exploited to launch e.g. "file" or "chrome:" URIs in Firefox. For more information see: SA31120 2) Input passed to XUL based error pages is not properly sanitised before being returned to a user and can be exploited to e.g. conduct spoofing attacks. In combination with vulnerability #1 this can be exploited to inject arbitrary script code and execute arbitrary code in "chrome" context, but requires that a specially crafted URI is passed to Firefox and that Firefox is not running. The vulnerabilities are reported in versions prior to 3.0.1.
Solution	Update to version 3.0.1. http://www.mozilla.com/en-US/firefox/
Reported by	The vendor credits: 1) Billy Rios 2) Ben Turner and Dan Veditz (Mozilla developers)
Original Advisory	MFSA 2008-35: http://www.mozilla.org/security/announce/2008/mfsa2008-35.html