spp_http_decode: CGI Null Byte attack detected

[nowhere <nowhere () tear com>]

I am getting hits for "spp_http_decode: CGI Null Byte attack detected"
for traffic to a vendor's web site.  I've looked over the packet, and
sure enough, the vendor is using a %00 as part of their form data.
This traffic from an internal host to the vendor's site, and I'm sure
it's not a hacker.

How can I avoid this false positive?   A reference that describes the
spp stuff would be great too.

I'm on Snort-1.7 with the most recent packet rules.

Thanks!

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