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Network Security Snort-Signatures
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[Snort-sigs] Loopback Traffic from and to non Loopback-IP

from [Lutz Schildt] Network Security [Permanent Link]
Subject: [Snort-sigs] Loopback Traffic from and to non Loopback-IP
Date: Mon, 07 Aug 2006 17:51:49 +0200 
Hi everyone,

I just had Snort alering me about this:



#(1 - 6417) [2006-08-07 10:03:53] [local/150] [snort/150]  (snort
decoder) Bad Traffic Loopback IP
IPv4: 72.30.*.* -> 195.90.*.*
TCP:  port=* -> dport: * chksum=0
Payload:  length = 195

000 : 47 45 54 20 2F 72 6F 62 6F 74 73 2E 74 78 74 20
GET /robots.txt
010 : 48 54 54 50 2F 31 2E 30 0D 0A 48 6F 73 74 3A 20
HTTP/1.0..Host:


It's valid HTTP traffic, why would snort tell me it's Bad Loopback
Traffic? It's the first time in about 4 years of snort that this
happened. Is it maybe because chksum=0?

Kind regards

Lutz Schildt


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