Feeds

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

Black hats, take note

Remote control for virtualized desktops

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.

Top 5 reasons to deploy VMware with Tegile

More from The Register

next story
Regin: The super-spyware the security industry has been silent about
NSA fingered as likely source of complex malware family
Why did it take antivirus giants YEARS to drill into super-scary Regin? Symantec responds...
FYI this isn't just going to target Windows, Linux and OS X fans
Privacy bods offer GOV SPY VICTIMS a FREE SPYWARE SNIFFER
Looks for gov malware that evades most antivirus
Home Office: Fancy flogging us some SECRET SPY GEAR?
If you do, tell NOBODY what it's for or how it works
HACKERS can DELETE SURVEILLANCE DVRS remotely – report
Hikvision devices wide open to hacking, claim securobods
'Regin': The 'New Stuxnet' spook-grade SOFTWARE WEAPON described
'A degree of technical competence rarely seen'
Syrian Electronic Army in news site 'hack' POP-UP MAYHEM
Gigya redirect exploit blamed for pop-rageous ploy
Astro-boffins start opening universe simulation data
Got a supercomputer? Want to simulate a universe? Here you go
prev story

Whitepapers

10 ways wire data helps conquer IT complexity
IT teams can automatically detect problems across the IT environment, spot data theft, select unique pieces of transaction payloads to send to a data source, and more.
Getting started with customer-focused identity management
Learn why identity is a fundamental requirement to digital growth, and how without it there is no way to identify and engage customers in a meaningful way.
How to determine if cloud backup is right for your servers
Two key factors, technical feasibility and TCO economics, that backup and IT operations managers should consider when assessing cloud backup.
Reg Reader Research: SaaS based Email and Office Productivity Tools
Read this Reg reader report which provides advice and guidance for SMBs towards the use of SaaS based email and Office productivity tools.
Mitigating web security risk with SSL certificates
Web-based systems are essential tools for running business processes and delivering services to customers.