Mozilla regrets keeping quiet on SSL certificate theft

"We should have informed Web users," says Firefox maker of Comodo hack

Mozilla today said that it regretted staying silent when it found out last week that hackers had stolen digital certificates for some of the Web's biggest sites, including Google, Skype, Microsoft, Yahoo and its own add-on site.

On March 15, attackers used a valid username and password to obtain nine SSL certificates -- which essentially prove that a site is what it says it is -- from an Comodo certificate reseller. The certificates were for six Web sites, including the log-on sites for Microsoft's Hotmail, Google's Gmail, the Internet phone and chat service Skype, and Yahoo Mail. A certificate for Mozilla's Firefox add-on site was also acquired.

Comodo disclosed the breach of its reseller and the theft of the SSL certificates on March 23. Between March 15, when Comodo realized its reseller had been hacked, and March 23, the company revoked the certificates and contacted browser makers Mozilla, Google and Microsoft.

Although Google patched Chrome on March 17, Mozilla and Microsoft issued updates to Firefox and Windows on March 22 and March 23, respectively. Those patches added the stolen certificates to the browsers' blacklists as a fallback defense in case users reached fake sites secured with the certificates.

Comodo said evidence pointed to Iranian government involvement in the attack and theft, and speculated that the certificates were stolen to set up fake sites where authorities could identify activists and monitor their e-mail and other digital communications.

None of the browser makers went public with the Comodo hack or the existence of the rogue certificates before March 22.

"Mozilla did not publish the information we received prior to shipping a patch," the company acknowledged in a Friday entry on its security blog. "In early discussions, we were concerned that any indication that we knew about the attack would lead to attackers blocking our security updates as well."

Today, Mozilla said that that was a mistake.

"In hindsight, while it was made in good faith, this was the wrong decision. We should have informed Web users more quickly about the threat and the potential mitigations as well as their side-effects," said Mozilla.

Jacob Appelbaum, a researcher at the University of Washington's Security and Privacy Research Lab who independently uncovered the certificate theft, had urged Mozilla developers to warn users rather than wait to ship a blacklist update, even if that meant ignoring Comodo's request that everyone stay in sync and not disclose the theft until March 23.

In an interview with Computerworld earlier this week, Appelbaum argued that the delay in disclosing information put Iranian anti-government activists' lives at risk.

"By keeping this quiet for eight days, Comodo and others put lives at risk," charged Appelbaum. "[Iranian activists] were completely unable to protect themselves during that time. Users should have had this information sooner."

And he dismissed the idea that Comodo and the browser makers, particularly Mozilla, should worry about "responsible disclosure" -- the practice of withholding information about a security bug until a fix is ready -- because the underlying problem was not a vulnerability that others could exploit.

"This is not a normal attack. Disclosure does not allow anyone else to perform this attack -- only the attacker with the certificate is able to take advantage of this situation," Appelbaum told Mozilla. "Only the attacker will benefit from a delay."

In a back-and-forth on Bugzilla, the Firefox bug- and change-tracking database, Appelbaum also pushed Mozilla to change the way that Firefox handles OCSP (online certificate status protocol), which is used to determine if a certificate has been revoked by an issuing authority, such as Comodo.

"I really think enabling OCSP to 'required' is the minimum safe thing to do," Appelbaum wrote on Bugzilla March 18, "It's a work around that will fail closed and while it's a bad thing, it seems like the best out of all of a bunch of bad choices."

At times, Appelbaum was scathing in his criticism of Mozilla's refusal to publicly disclose the theft and warn Firefox users.

"Firefox has majorly dropped the ball here," he said Tuesday on Bugzilla. "After the entire CA [certificate authority] model has shown time and time again to be security nightmare, Firefox should have led the way. That's what the Internet expects from Mozilla and it's what I expect from Mozilla."

Appelbaum said some of the same in his interview with Computerworld on Wednesday.

"This was a gigantic failure on Mozilla's part," Appelbaum said then. "They believe disclosure will harm users. That's bogus."

Appelbaum did not reply to an e-mail today requesting comment on Mozilla's mea culpa.

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.

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

Join the newsletter!

Error: Please check your email address.
Rocket to Success - Your 10 Tips for Smarter ERP System Selection

Tags securityMicrosoftbrowsersGooglesoftwareapplicationsmozillaYahooCybercrime and Hacking

Keep up with the latest tech news, reviews and previews by subscribing to the Good Gear Guide newsletter.

Gregg Keizer

Computerworld (US)
Show Comments

Cool Tech

SanDisk MicroSDXC™ for Nintendo® Switch™

Learn more >

Breitling Superocean Heritage Chronographe 44

Learn more >

Toys for Boys

Family Friendly

Panasonic 4K UHD Blu-Ray Player and Full HD Recorder with Netflix - UBT1GL-K

Learn more >

Stocking Stuffer

Razer DeathAdder Expert Ergonomic Gaming Mouse

Learn more >

Christmas Gift Guide

Click for more ›

Most Popular Reviews

Latest Articles

Resources

PCW Evaluation Team

Edwina Hargreaves

WD My Cloud Home

I would recommend this device for families and small businesses who want one safe place to store all their important digital content and a way to easily share it with friends, family, business partners, or customers.

Walid Mikhael

Brother QL-820NWB Professional Label Printer

It’s easy to set up, it’s compact and quiet when printing and to top if off, the print quality is excellent. This is hands down the best printer I’ve used for printing labels.

Ben Ramsden

Sharp PN-40TC1 Huddle Board

Brainstorming, innovation, problem solving, and negotiation have all become much more productive and valuable if people can easily collaborate in real time with minimal friction.

Sarah Ieroianni

Brother QL-820NWB Professional Label Printer

The print quality also does not disappoint, it’s clear, bold, doesn’t smudge and the text is perfectly sized.

Ratchada Dunn

Sharp PN-40TC1 Huddle Board

The Huddle Board’s built in program; Sharp Touch Viewing software allows us to easily manipulate and edit our documents (jpegs and PDFs) all at the same time on the dashboard.

George Khoury

Sharp PN-40TC1 Huddle Board

The biggest perks for me would be that it comes with easy to use and comprehensive programs that make the collaboration process a whole lot more intuitive and organic

Featured Content

Latest Jobs

Don’t have an account? Sign up here

Don't have an account? Sign up now

Forgot password?