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'Dexter' Directly Attacks Point-of-Sale Systems
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User Rank: Ninja
12/17/2012 | 8:04:24 PM
re: 'Dexter' Directly Attacks Point-of-Sale Systems

sounds like one nasty little malware. There is a lot of sensitive
data that is kept on POS systems. Companies keep all sorts of
customer information in their databases. Take for example a car
dealerships point of view contains license, plate, dmv info, credit
info., and purchase history. That just saved an awful lot of time
that would have had to been gotten through social engineering and
research. 40 countries are feeling the effects I can't imagine that
this will be as much of a that in the near future.



Mark Bower
Mark Bower,
User Rank: Apprentice
12/13/2012 | 12:52:46 AM
re: 'Dexter' Directly Attacks Point-of-Sale Systems
See my other comment and details here:
Mark Bower
Mark Bower,
User Rank: Apprentice
12/13/2012 | 12:52:18 AM
re: 'Dexter' Directly Attacks Point-of-Sale Systems
There's an easy approach for this that many merchants are already using with great success - details below. In a nutshell, never let the POS see the cardholder data, but do it in such as way that the POS doesn't have to change and can still use the protected data.


Disclaimer: I work for a vendor providing payment transaction security technology to US payment acquirers, processors, gateways and merchants.
User Rank: Apprentice
12/12/2012 | 2:10:05 PM
re: 'Dexter' Directly Attacks Point-of-Sale Systems
Seems to me to be fairly easy to mitigate. Keep the POS terminals off the internet. Run their outbound-traffic through a central proxy and 'whitelist' the websites they can access. Close down all the other egress ports. If the malware can't check into the C&C server, this attack is largely unsuccessful. Too bad we don't know the initial infection mechanism yet, although I'll wager it's-a phishing email.

Oh yeah, and take another look at PCI-Req. 1.3.3.
User Rank: Ninja
12/12/2012 | 1:25:36 PM
re: 'Dexter' Directly Attacks Point-of-Sale Systems
Fixing the Point of Sale Terminal (POST)

The POST will need to be re-designed to accept customer "Smart Cards"

The Customer Smart Card will need an on-board processor, -- with PGP

When the customer presents the card it DOES NOT send the customer's card number to the POST. Instead, the POST will submit an INVOICE to the customer's card. On customer approval the customer's card will encrypt the invoice together with authorization for payment to the PCI ( Payment Card Industry Card Service Center ) for processing and forward the cipher text to the POST

Neither the POST nor the merchant's computer can read the authorizing message because it is PGP encrypted for the PCI service. Therefore the merchant's POST must forward the authorizing message cipher text to the PCI service center.

On approval the PCI Service Center will return an approval note to the POST and an EFT from the customer's account to the merchant's account.

The POST will then print the PAID invoice. The customer picks up the merchandise and the transaction is complete.

The merchant never knows who the customer was: the merchant never has ANY of the customer's PII data.

Cards are NOT updated. They are DISPOSABLE and are replaced at least once a year -- when the PGP signatures are set to expire. Note that PGP signatures can also be REVOKED if the card is lost.
User Rank: Strategist
12/12/2012 | 3:47:58 AM
re: 'Dexter' Directly Attacks Point-of-Sale Systems
There have been numerous attacks on POS systems over the years, and the technology doesn't seem to have become a lot more secure. Any readers out there hear of good solutions for securing POS?
--Tim Wilson, editor, Dark Reading

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