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'High impact' Gmail password security hole blew accounts wide open

Payday for researcher who spotted webmail programming gaffe

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Vid Google has fixed a "high impact" security bug in Gmail's password reset system that could have left any account wide open to a crafty hijacker.

The flaw, spotted by security researcher Oren Hafif, was exploited by sending a spoofed email that reminds the Gmail user that it's time to reset their password. Clicking on the link sends the user to a website that masquerades as a Google page and asks for the user for a new password. That hacker-controlled site also initiates a cross-site request forgery attack via XSS that tricks Google into handing over the victim's login cookie.

"I want you to be honest and agree that if Google says that 'you've confirmed ownership' of your Google Account, and asks you to choose a new password you will not do so? At least your auntie would!" Hafif said in a blog post explaining the attack.

The spoof site can shift the user to a secure Google web page, but by this point, the attacker will have harvested the username, new password and the login cookie for the account. Once inside, they would also get free rein to change passwords on other services associated with that Gmail email address.

Hafif says he alerted Google to the issue and the Chocolate Factory fixed it within 10 days and confirmed he will receive a payment under its bug bounty program, although Google isn't saying how much it is giving him.

Youtube video of the Gmail exploit

Hafif, who'll earn a bounty for reporting the flaw, has also uploaded a video, see above, showing how the attack takes place, backed by some Euro happy house (Can't slow down by Nicco and Bastian Bates, ahem) that will have you reaching for the glowsticks and green lasers and gurning in sympathy. ®

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