Twitter

TwitterA French hacker claims to have broken into Twitter‘s internal administration system, enabling him to access the accounts of millions of Twitter users – including Barack Obama, Britney Spears, Ashton Kutcher and Lily Allen.

The hacker – known as ‘Hacker Croll’ – claims that he was able to access Twitter’s internal administration system after stealing a password from a staffer at the micro-blogging website. 

It is alleged that by resetting the employee’s Yahoo password after guessing his ‘secret question’, Hacker Croll found the information about the staffer’s Twitter login credentials.

Claims appear to be confirmed by screenshot images uploaded to a French blog, which give a glimpse into the micro-blogging site’s admin panel revealing that the likes of Kutcher and Allen have blocked other Twitter users, such as celebrity gossipmonger Perez Hilton, from contacting them. 

Amongst the private information accessible was the email addresses of compromised accounts, mobile phone numbers (if one was associated with the account), and the list of accounts blocked by the affected user.

"This is just the latest in a string of security issues at Twitter in recent months, and the website is surely in danger of losing the confidence of its users who will be rattled by yet another breach," said Graham Cluley, senior technology consultant at Sophos. 

"Just like with the recent Twitter worm outbreaks, this is not so much a case of Twitter raising awareness amongst its many users about sensible online security, but learning a few lessons itself. Careless security by the micro-blogging site could potentially put millions of Twitter users at risk."