Google Inc. has fixed a security flaw in its Gmail Web-based e-mail service that allowed attackers to hijack users' e-mail accounts.
"Google was recently alerted to a potential security vulnerability affecting the Gmail service. We have since fixed this vulnerability, and all current and future Gmail users are protected," Google spokesman Nathan Tyler said.
Tyler declined to discuss the nature of the problem, but a source close to Google confirmed that the flaw allowed an attacker to gain complete control over a user's account.
The problem was in the way Gmail authenticated users. An attacker could steal a so-called cookie file identifying the user by making use of a seemingly innocent link to Google's own Web site, according to a report on the Web site of the Israeli publication Nana NetLife Magazine on Thursday.
The cookie allowed an attacker to sign on to Gmail as the victim from any computer without having to enter a password. The attacker would continue to be able to access the Gmail account even if the password were changed, according to Nana NetLife, which cited an Israeli hacker named Nir Goldshlagger.
An investigation by Google found that only a handful of Gmail users were victimized, the source close to the Mountain View, California-based company said.
Google announced Gmail in April, grabbing headlines because of the massive 1GB storage space provided with a Gmail account. The service is still officially in beta testing and Internet users can only get accounts after receiving an invitation from a current user. Google does not disclose how many Gmail accounts it hosts.
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