Full Disclosure mailing list archives
Possible Google Account loophole
From: Cryptreaper <cryptreaper () gmail com>
Date: Wed, 28 May 2008 16:18:17 +0500
Hi, There is a slight possibility that an attacker can guess password of a google account due to a possible loop hole in their captcha system. It happens when a user tries to login to a Google account with a wrong password for a number of times, the system challenges the user with a captcha. If the attacker enters both wrong password and captcha they are given a warning that they have entered wrong username/password as well as captcha text not being correct. Also if only the user name/password if wrong, the warning message says wrong password. But if the user name password combination is correct but ONLY captcha test fails, the user is given only the captcha warning. This means that user name /password combination was correct and thus the attacker (which could be an automated bot) need not provide correct captcha text in order to figure out the password. _______________________________________________ Full-Disclosure - We believe in it. Charter: http://lists.grok.org.uk/full-disclosure-charter.html Hosted and sponsored by Secunia - http://secunia.com/
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