View Full Version : Firefox/moxilla Users

09-05-2005, 19:55
Hello everyone, I just found this on another forum and because I'm not sure if it's been up already I'm adding it here for the Firefox users amongst us:

Critical Flaw Found in Firefox Matthew Broersma, Techworld.com
Mon May 9,11:00 AM ET

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 update.mozilla.org and addons.mozilla.org sites, according to security experts.

The flaws were confidentially reported to the Foundation on May 2, but by Saturday details had been leaked and were reported by several security organizations, 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.

Two Vulnerabilities Found
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 update.mozilla.org and addons.mozilla.org, 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 Mozillazine.org.

So there you are, nothing is safe from these idiots!

Bloody Hijackers! :mad:

09-05-2005, 21:01
oh, joy!! i just use mozilla to stop me opening too many windows and crashing my computer, but now i have to start fiddling with options, great!

09-05-2005, 21:23
With success comes those who want to knock it down.

The world takes another turn

Baggers over and out.

10-05-2005, 00:41

I thought Firefox was teh roxxorest and invulnerable to averyhting!@



Like i've said before, Firefox needs at least one more version to get the kinks ironed out. At least with IE, you know what problems to expect.

Delicious Soy
10-05-2005, 01:17
Beh, I use Opera, the happy medium :p

10-05-2005, 01:18
Already fixed server side I do believe...

Update: 05/09 20:20 GMT by T : Rebron of the Mozilla Foundation sends a correction; this is really the same flaw reported yesterday. He suggests that you glance at the Mozilla security alert on this hole (as well other alerts at the Mozilla Security Center), and says "The Mozilla Foundation has made changes to our update servers that will protect users from this arbitrary code execution exploit."