The data breach disclosed earlier this month by the Yahoo-owned microblogging platform Tumblr affects 65 million users.
On May 12, Tumblr warned that a third party gained access to the email addresses and hashed passwords of Tumblr users who had registered accounts up until early 2013, before the company was acquired by Yahoo. Tumblr said it had not found any evidence that the leaked information was used to access accounts, but it reset the passwords of affected customers as a precaution.
Tumblr refused to say how many users had been affected by the breach, but it turns out that it’s a significant number. An individual using the online moniker “peace_of_mind” has been offering information associated with 50 million Tumblr accounts on a darknet website called “The Real Deal” for the price of 0.4255 Bitcoin (roughly $225).
Australian security researcher Troy Hunt has analyzed the data and found a total of 65,469,298 records. The information has been added to Hunt’s “Have I Been Pwned” service to allow users to check if they are affected. Hunt reported that 20 percent of the accounts were already present in Have I Been Pwned.
People who have signed up for the service will also be notified via email. It’s worth noting that some users complained about not being notified by Tumblr directly after the breach was first disclosed.
Vice’s Motherboard reported that the information is being sold by “peace_of_mind” for a relatively small amount of money because the passwords are hashed using SHA1 and salted, which makes them difficult to crack.
The same hacker is also selling millions of records associated with the users of several other popular services, such as LinkedIn (167 million accounts sold for 2 Bitcoin), the adult dating website Fling.com (40 million accounts sold for 0.58 Bitcoin), and the social networking website Myspace (360 million accounts sold for 6 Bitcoin).
The LinkedIn data was leaked as a result of the 2012 data breach. Until “peace_of_mind” put the information up for sale, it was believed that the incident only affected 6.5 million accounts.
Reddit users are also affected by these recent mega leaks – the social news website said it observed an uptick in account takeovers by malicious third parties. The company reported last week that it had reset the passwords of roughly 100,000 accounts over a two-week period.
Related Reading: LinkedIn Breach: How a 6.5M Hole Could Sink a 160M Ship
Eduard Kovacs (@EduardKovacs) is a contributing editor at SecurityWeek. He worked as a high school IT teacher for two years before starting a career in journalism as Softpedia’s security news reporter. Eduard holds a bachelor’s degree in industrial informatics and a master’s degree in computer techniques applied in electrical engineering.
More from Eduard Kovacs
- Exploitation of 55 Zero-Day Vulnerabilities Came to Light in 2022: Mandiant
- Organizations Notified of Remotely Exploitable Vulnerabilities in Aveva HMI, SCADA Products
- Waterfall Security, TXOne Networks Launch New OT Security Appliances
- Hitachi Energy Blames Data Breach on Zero-Day as Ransomware Gang Threatens Firm
- New York Man Arrested for Running BreachForums Cybercrime Website
- Exploitation of Recent Fortinet Zero-Day Linked to Chinese Cyberspies
- Mozilla Patches High-Severity Vulnerabilities With Release of Firefox 111
- Microsoft: 17 European Nations Targeted by Russia in 2023 as Espionage Ramping Up
Latest News
- Verosint Launches Account Fraud Detection and Prevention Platform
- Ransomware Gang Publishes Data Allegedly Stolen From Maritime Firm Royal Dirkzwager
- Zoom Paid Out $3.9 Million in Bug Bounties in 2022
- Oleria Scores $8M Seed Funding for ID Authentication Technology
- Exploitation of 55 Zero-Day Vulnerabilities Came to Light in 2022: Mandiant
- News Analysis: UK Commits $3 Billion to Support National Quantum Strategy
- Malicious NuGet Packages Used to Target .NET Developers
- Google Pixel Vulnerability Allows Recovery of Cropped Screenshots
