June 19, 2021

Security Breach at Mozilla.Org

A database of addons.mozilla.org user accounts was available to public. Chris Lyon, the director of infrastructure security at Mozilla has disclosed a security breach that revealed the addons.mozilla.org user accounts.

According to a post at Mozilla Security Blog, “On December 17th, Mozilla was notified by a security researcher that a partial database of addons.mozilla.org user accounts was mistakenly left on a Mozilla public server. The security researcher reported the issue to us via our web bounty program. We were able to account for every download of the database. This issue posed minimal risk to users, however as a precaution we felt we should disclose this issue to people affected and err on the side of disclosure.”.

Apparently, the database included 44,000 inactive accounts using older, md5-based password hashes. Mozilla has erased all the md5-passwords, rendering the accounts disabled. All current addons.mozilla.org accounts use a more secure SHA-512 password hash with per-user salts.

“It is important to note that current addons.mozilla.org users and accounts are not at risk. Additionally, this incident did not impact any of Mozilla’s infrastructure.”, said Mr. Lyon, Mozilla’s Director of Infrastructure Security.