Menu
Mozilla confirms critical Firefox bug

Mozilla confirms critical Firefox bug

Slates patch for March 30; flaw can't be used in upcoming Pwn2Own hack contest

Mozilla yesterday confirmed a critical vulnerability in the newest version of Firefox, and said it would plug the hole by the end of the month.

Although the patch won't be added to Firefox before next week's Pwn2Own browser hacking challenge, researchers won't be allowed to use the flaw, according to the contest's organizer.

"The vulnerability was determined to be critical and could result in remote code execution by an attacker," Mozilla acknowledged in a post to its security blog late Thursday. "The vulnerability has been patched by developers and we are currently undergoing quality assurance testing for the fix."

Firefox 3.6, which Mozilla launched in January, is affected, Mozilla said, adding that it would be patched in version 3.6.2, currently slated to ship on March 30.

The bug was disclosed by Russian researcher Evgeny Legerov a month ago in a message posted on a forum hosted by Immunity, the Miami Beach, Fla. developer best known for its Canvas penetration testing framework. Legerov works for Moscow-based Intevydis, which produces the VulnDisco add-on for Canvas.

Legerov did not publish attack code, and initially refused to provide details to Mozilla, according to a March 4 entry he posted on his blog. "I've ignored e-mails ... from Mozilla, please do not waste my and your time anymore," Legerov wrote. The blog has since been deleted, but is still available via Google's cache .

In comments appended to a vulnerability alert published by Danish bug tracker Secunia, several users questioned Legerov's motives for making the announcement, while others chided Secunia for not thoroughly testing the flaw or claimed that it was all a hoax.

Mozilla yesterday said Legerov had eventually sent them "sufficient details to reproduce and analyze the issue."

Until the March 30 patch is released, users can upgrade Firefox to the beta of version 3.6.2, which includes the fix, by downloading the preview .

Although Apple and Google have recently updated Safari and Chrome , respectively -- beefing up the browsers' security before the $100,000 Pwn2Own hacking contest starts March 24 -- the version of Firefox that will be used in the challenge will lack the patch for Legerov's vulnerability. Pwn2Own will pit only production versions of Chrome, Firefox, Internet Explorer (IE) and Safari against the hacking talents of researchers.

However, that doesn't mean hackers will be able to use the bug to claim one of the $10,000 prizes for successfully exploiting Firefox. "We will have our entire research team on-site so that we can do our best to ensure that known issues such as this one do not turn up at our contest," said Aaron Portnoy, a research team lead with 3Com TippingPoint, the company sponsoring Pwn2Own.

Portnoy, who organized the fourth annual contest, has predicted that Microsoft 's IE8 will be the first browser to fall during the three-day event.

Mozilla will also patch Firefox 3.0 (with 3.0.19) and Firefox 3.5 (with 3.5.9) on March 30. Firefox 3.0.19 will be the final security update for the browser Mozilla debuted in mid-2008.

Gregg Keizer covers Microsoft, security issues, Apple, Web browsers and general technology breaking news for Computerworld. Follow Gregg on Twitter at @gkeizer or subscribe to Gregg's RSS feed . His e-mail address is gkeizer@ix.netcom.com .

metatag data

Read more about security in Computerworld's Security Knowledge Center.

Follow Us

Join the ARN newsletter!

Error: Please check your email address.

Tags exploits and vulnerabilitiesFirefoxsecuritybrowserspwn2own

Upcoming

Slideshows

IN PICTURES: Windows 10 Sydney launch

IN PICTURES: Windows 10 Sydney launch

Tech lovers and party-goers alike headed down to Mrs Macquarie's Chair to be part of the world-first Windows 10 Launch Party. The night featured a presentation by Microsoft Australia managing director, Pip Marlow, DJs, live demonstrations and digital artistry by Lister.

IN PICTURES: Windows 10 Sydney launch
In Pictures: User guide to Windows 10

In Pictures: User guide to Windows 10

If you’re going for an immediate upgrade to Windows 10 from your Windows 7 or Windows 8/8.1 computer, this guide will get you up to speed as quickly as possible.

In Pictures: User guide to Windows 10

iasset.com is a channel management ecosystem that automates all major aspects of the entire sales, marketing and service process, including data tracking, integrated learning, knowledge management and product lifecycle management.

Show Comments