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August 26th, 2008
Researcher mines blogs, social networks to access bank accounts
A recent Google search of MySpace Inc.'s popular social networking site for several variations of terms describing a person's maternal grandparents returned more than 11,000 search results.
The search by security researcher and author Herbert Thompson illustrates the growing security threat posed by the massive amount of personal information posted on social networks, forums, blogs and other Web 2.0 destinations. Thompson sent the search results to Computerworld.
Posting seemingly innocuous information -- like a mother's maiden name or a pet's name -- could help a crook access personal data stored by banks, financial services firms and other companies, Thompson said. Many companies typically ask for such information from clients to reset a password on an account, he noted.
Thompson, who is founder and chief security strategist at People Security, a New York-based IT security consulting firm, described how easily personal information posted on a blog or social network could be used to break into a bank account in an article published in Scientific American this month.
With her permission, Thompson accessed a friend's bank account in an hour and a half after mining her personal blog personal for details like her birth date, birthplace, father's middle name and pet's name. He used the data to reset her e-mail password and gain access to an e-mail from her bank with instructions on how to reset her account password.
Thompson said in an interview that cybercriminals are increasingly mining personal data splashed throughout the Web 2.0 world. He noted that the questions that banks have long used to reset or recover passwords were typically seen as difficult for thieves to answer. Now, however, the answers to the questions are often readily available to crooks because so many people are now blogging about their personal lives or are creating personal profiles that are rife with this type of information, he noted.
As proof, Thompson pointed to the fact that thieves on underground forums typically charge 10 to 12 times more for stolen credit card numbers with the mother's maiden name or a pet's name of the owner than for the credit card alone.
"You may not think twice about posting your grandfather's name, but you've just released your mother's maiden name," he said. "There are a lot of places where you can claim to forget other questions, and the site will default to mother's maiden name. If I give you the log-in to one account, I've essentially given you a fish. If I give you the answer to people's password-recovery questions, I've taught you to fish. You can pillage their accounts."
The problem with the type of information that is posted in blogs and social networks can be compounded by the fact that "the Web -- especially Web 2.0, is very sticky," he added. Many archive sites contain snapshots of data long after the primary data has been removed. In addition, thieves can supplement information from Web 2.0 sites with public data from state motor vehicle departments or from sites containing home-ownership records, he noted.
To offset this problem, Thompson advised that people find out from their banks or financial services firms what information they use to reset passwords. Then, they can backtrack to see if any of the information about them required to answer those questions could be found on the Web, he added. If so, he advised online users to change the password-recovery answers or question.
"Most people are likely to find some scary mismatches -- that information is publicly available through some state or other government department, or it is something they have freely disclosed online. See if you are comfortable with your bank-account access … riding on those pieces of information."
Source: ComputerWorld
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