Feeds

Attack code for Firefox zero-day goes wild, says researcher

Black hats, take note

Next gen security for virtualised datacentres

A Russian security researcher on Thursday said he has released attack code that exploits a critical vulnerability in the latest version of Mozilla's Firefox browser.

The exploit - which allows attackers to remotely execute malicious code on end user PCs - triggers a heap corruption vulnerability in the popular open-source browser, said Evgeny Legerov, founder of Moscow-based Intevydis. He recently added it as a module to Vulndisco, an add-on to the Immunity Canvas automated exploitation system sold to security professionals.

"We've played a lot with it in our labs - it was very reliable," Legerov wrote in an email to The Reg. "Works against the default install of Firefox 3.6. We've tested it on XP and Vista."

The report comes as Mozilla pushed out a Firefox update that tackles three critical vulnerabilities in version 3.5.7. One of those bugs is also described as a heap corruption vulnerability, but Legerov said the flaw is different from the one his code exploits.

Mozilla issued a statement that read in part: "Mozilla takes all security vulnerabilities seriously, and have as yet been unable to confirm the claim of an exploit. We value the contributions of all security researchers and encourage them to work within our security process, responsibly disclosing vulnerabilities to ensure the highest level of security and best outcome for users."

Legerov said his firm does not provide advanced notification to software makers under an arrangement often referred to as responsible disclosure.

If Legerov's claim pans out, it would be one of the few times in recent memory that a zero-day vulnerability for Firefox has circulated in the wild. While the exploit is currently available only to those who pay a hefty licensing fee, wider circulation can't be far behind. This story will be updated as more is learned.

More about the bug is here and here. ®

This story was updated to correct an inaccuracy about the availability of Immunity Canvas.

The essential guide to IT transformation

More from The Register

next story
Goog says patch⁵⁰ your Chrome
64-bit browser loads cat vids FIFTEEN PERCENT faster!
Chinese hackers spied on investigators of Flight MH370 - report
Classified data on flight's disappearance pinched
NIST to sysadmins: clean up your SSH mess
Too many keys, too badly managed
Scratched PC-dispatch patch patched, hatched in batch rematch
Windows security update fixed after triggering blue screens (and screams) of death
Researchers camouflage haxxor traps with fake application traffic
Honeypots sweetened to resemble actual workloads, complete with 'secure' logins
Attack flogged through shiny-clicky social media buttons
66,000 users popped by malicious Flash fudging add-on
prev story

Whitepapers

Top 10 endpoint backup mistakes
Avoid the ten endpoint backup mistakes to ensure that your critical corporate data is protected and end user productivity is improved.
Implementing global e-invoicing with guaranteed legal certainty
Explaining the role local tax compliance plays in successful supply chain management and e-business and how leading global brands are addressing this.
Backing up distributed data
Eliminating the redundant use of bandwidth and storage capacity and application consolidation in the modern data center.
The essential guide to IT transformation
ServiceNow discusses three IT transformations that can help CIOs automate IT services to transform IT and the enterprise
Next gen security for virtualised datacentres
Legacy security solutions are inefficient due to the architectural differences between physical and virtual environments.