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Network Security Snort-Signatures
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[Snort-sigs] 119:4 False Positive after 302 - Moved Temporarily

from [Lee Clemens] Network Security [Permanent Link]
Subject: [Snort-sigs] 119:4 False Positive after 302 - Moved Temporarily
Date: Wed, 18 Jul 2007 20:54:01 -0400 
Hello,

Regarding http_inspect BARE BYTE UNICODE ENCODING and a possible false
positive
(Snort 2.7.0, 
preprocessor http_inspect_server: server default \ profile all \ ports { 80
}):

This packet was sent from my home system to Doubleclick after receiving a
HTTP/1.0 302 Moved Temporarily response to a previous GET request.

Since the request the client made was a direct response to a 302 from the
server, it seems this may be a situation that http_inspect should take into
consideration before alerting? As a client, I was merely requesting the page
the 302 error indicated I should GET (or if I was the server, the client was
only requesting a page I told it to request).

pcaps of the 302 error from server and the alerted packet are attached.
Traffic in between was standard TCP (...302; ACK; FIN,ACK; ACK || SYN;
SYN,ACK; ACK; GET...).

Kind Regards,
Lee

Attachment: 119-4.falsePositive.obfuscated.pcap
Description: Binary data

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