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Firefox suffers first 'extremely critical' security hole

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    Firefox suffers first 'extremely critical' security hole

    Javascript flaw unpatched and dangerous.

    Firefox has unpatched "extremely critical" security holes and exploit code is already circulating on the Net, security researchers have warned.

    The two unpatched flaws in the Mozilla browser could allow an attacker to take control of your system.

    A patch is expected shortly, but in the meantime users can protect themselves by switching off JavaScript. In addition, the Mozilla Foundation has now made the flaws effectively impossible to exploit by changes to the server-side download mechanism on the and sites, according to security experts.

    The flaws were confidentially reported to the Foundation on 2 May, but by Saturday details had been leaked and were reported by several security organisations, including the French Security Incident Response Team (FrSIRT). Danish security firm Secunia marked the exploit as "extremely critical", its most serious rating, the first time it has given a Firefox flaw this rating.

    In recent months Firefox has gained significant market share from Microsoft's Internet Explorer, partly because it is considered less vulnerable to attacks. However, industry observers have long warned that the browser is more secure partly because of its relatively small user base. As Firefox's profile grows, attackers will increasingly target the browser.

    The exploit, discovered by Paul of Greyhats Security Group and Michael "mikx" Krax, makes use of two separate vulnerabilities. An attacker could create a malicious page using frames and a JavaScript history flaw to make software installations appear to be coming from a "trusted" site. By default, Firefox allows software installations from and, but users can add their own sites to this whitelist.

    The second part of the exploit triggers software installation using an input verification bug in the "IconURL" parameter in the install mechanism. The effect is that a user could click on an icon and trigger the execution of malicious JavaScript code. Because the code is executed from the browser's user interface, it has the same privileges as the user running Firefox, according to researchers.

    Mozilla Foundation said it has protected most users from the exploit by altering the software installation mechanism on its two whitelisted sites. However, users may be vulnerable if they have added other sites to the whitelist, it warned.

    "We believe this means that users who have not added any additional sites to their software installation whitelist are no longer at risk," Mozilla Foundation said in a statement published on

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    Re: Firefox suffers first 'extremely critical' security hole


    Firefox have released v1.0.4 of it's browser software to address some major security bugs which were discovered over the weekend.
    They haven't updated their homepage yet, but you can download it from the mozilla ftp site here (link works for Win32, Linux and Mac).

    FTP directory /pub/ at
    Oh, everything's too damned expensive these days. This Bible cost 15 bucks! And talk about a preachy book! Everybody's a sinner! Except this guy.


      Re: Firefox suffers first 'extremely critical' security hole

      So no browser is secure enough. Not IE, not FF


        Re: Firefox suffers first 'extremely critical' security hole

        Safari is, on a Mac
        An Android a day keeps the Apple away!


          Re: Firefox suffers first 'extremely critical' security hole

          Firefox 1.0.4 released

          Get it now at