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Network Security Snort-Signatures
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[Snort-sigs] new rule for detect icmp undefined code (>18)

Subject: [Snort-sigs] new rule for detect icmp undefined code (>18)
Date: Sun, 27 Nov 2005 22:41:32 +0100 (CET)
Hi,

Im received icmp packet with code is 19 (and type is 8),

snort detected this rule because type 8 and code >0,

but my new rule, detect all type if code >18

please check and maybe add this new rule :

icmp-info.rules:alert icmp $EXTERNAL_NET any -> $HOME_NET any (msg:"ICMP undefined code"; icode:>18; classtype:misc-activity; )

My linux src include don't have code > 18, but maybe im wrong ?

http://www.iana.org/assignments/icmp-parameters

My fw iptables over linux accept type 8 (echo) / type 0 (reply) with code
0 ! (default) [and linux reply with uknown code (19)]

Improve/comments are welcome.

Regards
Rmkml


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