Dropbox blames employee account breach for spam attack

The company said it plans to introduce new protections to guard against account compromises

Dropbox said Tuesday one of its employee's accounts was compromised, leading to a raft of spam last month that irritated users of the cloud-storage service.

A stolen password was used to access the employee's account, which contained "a project document with user email addresses," Dropbox engineer Aditya Agarwal wrote on the company's blog.

[ Also on InfoWorld: 10 file-sharing options: Dropbox, Google Drive, and more | Find out how to block the viruses, worms, and other malware that threaten your business, with hands-on advice from expert contributors in InfoWorld's "Malware Deep Dive" PDF guide. | Keep up with key security issues with InfoWorld's Security Adviser blog and Security Central newsletter. ]

"We believe this improper access is what led to the spam," Agarwal wrote. "We're sorry about this, and have put additional controls in place to help make sure it doesn't happen again."

The company also found that usernames and passwords that had been stolen from other websites were used to access "a small number of Dropbox accounts," Agarwal wrote. Hackers commonly try username and password combinations from breaches on other web services in hopes people use the same combination, a common security problem.

The spam, written in German, English, and Dutch, advertised gambling websites and seemed to affect only European users. Many of those users wrote on the company's forum they had used a unique email address solely for Dropbox, leading to suspicions the company had been hacked.

Dropbox brought in an outside security team to investigate, but maintained on July 21 that it had found no intrusion of its internal systems or other compromised accounts.

In light of the breach, Dropbox said it plans in a few weeks to introduce two-factor authentication, such as a system that would send a temporary code to a person's phone.

Other planned upgrades include a new page that will show logs of user account activity and other "automated mechanisms to help identify suspicious activity," Agarwal wrote. Users may also be prompted to change their password if it has not been changed in a long time.

Send news tips and comments to jeremy_kirk@idg.com

Recommended
Join the discussion
Be the first to comment on this article. Our Commenting Policies