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Irish Bank Outage Points Out POS Vulnerabilities

Written by Evan Schuman
May 6th, 2009
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On Tuesday (May 5) , the National Irish Bank (NIB) reported that “technology problems were behind the failure of its debit and credit cards at point-of-sale machines in shops and other businesses across the country” earlier that day. But while the unspecified glitch was resolved within a few hours, retail POS issues continued, prompting the bank to “apologize unreservedly,” according to The Irish Times.

Here’s where it gets interesting. The bank issued a statement that “as soon as the problem was identified, the network was switched to a back-up system and National Irish Bank customers are able to access their funds at the bank’s ATMs as normal now.” But what about Ireland’s retailers, whose transactions were halted? No emergent backup system for them? Another reminder that banks know ATMs and vaults, but POS is a new and lower priority concept.


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Kill All The Passwords

This article does mention, but does not give enough attention to, the fact that the attacks discussed are only feasible when the encrypted password file can be copied and subjected to an offline attack. The trick is to have authentication performed on a separate, much more strongly secured host - such as an Active Directory Domain Controller, or a Kerberos server, or a NIS+ server, or even using something as banal as an LDAP-over-SSL authentication dialog. In these environments, the odds of the "password file" being stolen and subjected to an offline attack go to near zero, and only online attacks may be carried out by the attacker. With sensible exponential backoff between failed password attempts, lockout after a modest number of failed attempts on a single account, and pattern detection, that minimum 7 character password is quite secure enough. Passwords aren't dead yet for security purposes, and they will be with us for a very long while to come for practical purposes. The trick is to employ them correctly. Read more...
The possibilities you describe are years away from being implemented at best, so for the moment passwords are an ugly reality. Luckily, password managers can easily manage hundreds of passwords of any length. The only thing a user needs to remember is the master password. It seems like an easier task to educate users on how to use password managers rather than implement complex security technology on a global basis. Read more...