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Yahoo, Hotmail, Gmail all vulnerable to password reset hack
- — 22 September, 2008 07:44
Yahoo Mail isn't the only Web-based mail service that could be duped into giving up someone else's account password, the tactic that some have argued was used to break into Sarah Palin's e-mail last week.
Google's Gmail, Microsoft's Windows Live Hotmail and Yahoo's Mail all rely on automated password reset mechanisms that can be abused by knowing a username associated with an account and an answer to a single security question, according to quick tests run by Computerworld.
Computerworld reporters and editors were able to "break" into their own and colleagues' accounts on all three services, then reset passwords armed only with the account's username and the correct response to one of a limited number of common security questions, such as mother's maiden name, the name of a favorite pet or the make of a first car.
Some of the personal information that would provide answers to the security questions may be easily found by searching social networking sites or the Internet, the approach a hacker labeled as "rubico" claimed to have used to dig up the responses necessary to access Palin's account.
Hackers who know the username of an account -- which is often identical to the part of the e-mail address that precedes the "@" symbol -- and correctly type the CAPTCHA (Completely Automated Public Turing Test to Tell Computers and Humans Apart), the name for the distorted, scrambled characters meant to stymie automated bots, are faced with only a security question before allowed to change the account password.
None of the services required that the new password be sent to an alternate e-mail address -- although that was an option for all three -- and instead offered an all-online process.
Adam O'Donnell, director of emerging technologies at message security vendor Cloudmark, said that automated password reset is the rule in Web-based mail, whether the service is free, like Yahoo, Hotmail and Gmail, or offered as part of the monthly fee by one's ISP.
"ISPs have razor-thin margins, and one call to the help desk to reset a password would wipe out the month's profit on that user," said O'Donnell in an interview yesterday.
At the time, although other security experts were skeptical of the hacker's claim to have accessed Palin's account through a password reset, O'Donnell had said it sounded "very plausible."
According to rubico, who some have speculated is the 20-year-old son of a Tennessee state legislator, the online research needed to reset Palin's password took just 45 minutes.