Published: Tue, December 04, 2018
Markets | By Otis Pena

Quora breach leaks data on over 100 million users

Quora breach leaks data on over 100 million users

Quora said it's in the process of notifying all users who it believes were impacted by the hack.

The kinds of information that was exposed include account information, like users' names, email addresses, passwords and data imported from linked networks (like Facebook and Google).

The breach, discovered on Friday, did not affect question and answers that are written anonymously, the company said, adding that it has also notified law enforcement officials. Users who used a password to secure their account have already had their password invalidated and will need to choose a new one the next time they log in. If the incident has irked you enough to delete your Quora account, you can find out how to do so here, and also learn about resetting your password and obtaining a copy of your data from the site on this attack FAQ page. On Monday it began emailing affected users.

Quora is alerting users by email and a banner on its help pages
Quora is alerting users by email and a banner on its help pages

"It is our responsibility to make sure things like this don't happen, and we failed to meet that responsibility".

Anonymous questions and answers were not affected by the breach because Quora doesn't store the information of anonymous contributors.

"We're still investigating the precise causes and in addition to the work being conducted by our internal security teams, we have retained a leading digital forensics and security firm to assist us". If it's one that uses fewer than 10,000 iterations of a fast algorithm such as MD5 with no cryptographic salt, hackers using off-the-shelf hardware and publicly available word lists can crack as many as 80 percent of the password hashes in a day or two. Quora's post said it will log out all affected users, and push a password reset. A function such as bcrypt, by contrast, can prevent a large percentage of hashes from ever being converted into plaintext.

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