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Network Security Focus-IDS
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Re: Using Snort to find creditcard data?

from [Siim Põder] Network Security [Permanent Link]
Subject: Re: Using Snort to find creditcard data?
Date: Wed, 10 Oct 2007 11:41:17 +0300 
Yo

jerikl75@gmail.com wrote:

Would it be possible to write a Snort rule that triggers on possible
creditcard numbers and how would it look like? PCI standars says that
all creditcard data should be encrypted, It woild be nice to verify
that no card data shows up where it shouldn't...


I wrote a dynamic rule for this. It does the Luhn check (as i understood
it) and prefix/length verification. It's a quick implementation and
probably uses a tad too much of CPU time, but seems to work. Any
suggestions/improvements are welcome.

http://p6drad-teel.net/~windo/jama/creditcard_number.c

add it to so_rules and add "creditcard" to

libs :=

section in the Makefile

Siim


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