Firefox vulnerability in its master password system has gone unpatched — for nine years!

Firefox tends to be one of the more secure browsers available to the general population. The browser is not without its flaws, but these flaws have tended to be fixed in a relatively timely fashion. But new reports indicate this is not always the case. According to a post released on Ad-Block Plus creator Wladimir Palant’s blog, there is a serious Firefox vulnerability that has gone unpatched for a mind-boggling nine years.

This Firefox vulnerability is related to the master password available for encryption of stored passwords. As Palant notes in his post, the actual encryption behind the master password is incredibly weak and easy to brute-force. The Firefox (and Thunderbird) master password system utilizes SHA-1 encryption, which is incredibly problematic. Palant states these issues as follows:

GPUs are extremely good at calculating SHA-1 hashes… a single Nvidia GTX 1080 graphics card can calculate 8.5 billion SHA-1 hashes per second. That means testing 8.5 billion password guesses per second. And humans are remarkably bad at choosing strong passwords… the average password is merely 40 bits strong. In order to guess a 40 bit password you will need to test 239 guesses on average. If you do the math, cracking a password will take merely a minute on average then.”

Making the problem even worse for Mozilla is the fact that one of its own researchers uncovered the flaws in their master password system roughly nine years ago. This bug report states that “softtoken’s master password KDF process should be stronger (currently easily brute forced due to low iteration count),” and at the time (and for nearly a decade) Mozilla chose inaction with regards to this issue.

After numerous InfoSec news sites reported Wladimir Palant’s findings, Mozilla stated that they had a fix for the rather glaring issue. According to Bleeping Computer’s report by Catalin Cimpanu, “Mozilla finally provided an official answer, suggesting this would be fixed with the launch of Firefox’s new password manager component — currently codenamed Lockbox and available as an extension.”

I’m thoroughly disappointed in Mozilla for its lack of oversight on an issue that had long ago been reported by their researchers. Hopefully, they have learned from this humiliation and will be more diligent in the future.

Photo credit: Mozilla Foundation

4 thoughts on “Firefox vulnerability in its master password system has gone unpatched — for nine years!”

    1. Derek Kortepeter

      I use either Brave or Tor. I used to be a major Firefox fanboy due to its decentralized open source environment, but sadly Mozilla is turning into the Silicon Valley jerks that many big companies like Google and Microsoft already have become.

    1. Derek Kortepeter

      I’ve heard good things about Bitwarden. It is open source, has a 1st party client for most devices, supports TOTP/2FA for free and hardware keys supported under a paid plan.

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