Feeds

Firefox JavaScript risk downplayed

Crash, bang but no exploit

Providing a secure and efficient Helpdesk

Update Flaws in the way Firefox handles JavaScript code only crash the browser (at worst), contrary to earlier reports that researchers had identified a zero-day exploit that might lend itself to malware-based attacks.

Researchers Mischa Spiegelmock and Andrew Wbeelsoi discussed the unpatched cross-platform vulnerability during a presentation at ToorCon hacker conference in San Diego last weekend. The stack overflow flaw said to be at the heart of the problem is down to Firefox's implementation of JavaScript which Spiegelmock described as a "complete mess". The hackers reportedly claimed the vulnerability was one of 30 security bugs in Firefox they knew.

Window Snyder, Mozilla's security chief, who witnessed the presentation on Saturday, initially suggested that that security bug illustrated by Spiegelmock and Wbeelsoi might be a variant of a well-understand attack. Snyder told News.com that she was uncomfortable that the researchers detailed possible exploits during their presentation, a common criticism by software vendors against security researchers against researchers who practice full disclosure.

After reviewing the flaw, Mozilla published a posting on its developer blog downplaying the seriousness of the bug, initially reported by El Reg and other news outlets as creating a means for hackers to execute hostile code on Windows, Mac OS X and Linux PCs. The posting contains an agreed statement by Spiegelmock in which the security researcher backtracks on claims made during the talk that Firefox was riddled with security bugs.

"As part of our talk we mentioned that there was a previously known Firefox vulnerability that could result in a stack overflow ending up in remote code execution. However, I have not succeeded in making this code do anything more than cause a crash and eat up system resources, and I certainly haven’t used it to take over anyone else’s computer and execute arbitrary code," the statement reads.

"I do not have 30 undisclosed Firefox vulnerabilities, nor did I ever make this claim. I have no undisclosed Firefox vulnerabilities. The person who was speaking with me made this claim, and I honestly have no idea if he has them or not."

Mozilla's Window Snyder adds in the posting that despite the reduced seriousness of the risk it was continued to investigate the issue. ®

Choosing a cloud hosting partner with confidence

More from The Register

next story
SMASH the Bash bug! Apple and Red Hat scramble for patch batches
'Applying multiple security updates is extremely difficult'
Apple's new iPhone 6 vulnerable to last year's TouchID fingerprint hack
But unsophisticated thieves need not attempt this trick
Hackers thrash Bash Shellshock bug: World races to cover hole
Update your gear now to avoid early attacks hitting the web
Oracle SHELLSHOCKER - data titan lists unpatchables
Database kingpin lists 32 products that can't be patched (yet) as GNU fixes second vuln
Who.is does the Harlem Shake
Blame it on LOLing XSS terroristas
Researchers tell black hats: 'YOU'RE SOOO PREDICTABLE'
Want to register that domain? We're way ahead of you.
Stunned by Shellshock Bash bug? Patch all you can – or be punished
UK data watchdog rolls up its sleeves, polishes truncheon
Ello? ello? ello?: Facebook challenger in DDoS KNOCKOUT
Gets back up again after half an hour though
prev story

Whitepapers

A strategic approach to identity relationship management
ForgeRock commissioned Forrester to evaluate companies’ IAM practices and requirements when it comes to customer-facing scenarios versus employee-facing ones.
Storage capacity and performance optimization at Mizuno USA
Mizuno USA turn to Tegile storage technology to solve both their SAN and backup issues.
High Performance for All
While HPC is not new, it has traditionally been seen as a specialist area – is it now geared up to meet more mainstream requirements?
Beginner's guide to SSL certificates
De-mystify the technology involved and give you the information you need to make the best decision when considering your online security options.
Security for virtualized datacentres
Legacy security solutions are inefficient due to the architectural differences between physical and virtual environments.