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Network Security Snort-Signatures
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[Snort-sigs] DNS Cache Poisoning

Subject: [Snort-sigs] DNS Cache Poisoning
Date: Wed, 6 Apr 2005 12:27:12 -0500
Anybody got a decent sig for this yet? I tried the one posted by ISC
and it generates a continuous stream of false positives.

alert udp $EXTERNAL_NET 53 -> $HOME_NET any (msg:"com DNS cache
poison"; content:!"TLD-SERVERS"; nocase; offset:10; depth:50;
content:"|c0|"; content:"|00 02|"; distance:1; within:2;
byte_jump:1,-3,relative,from_beginning; content:"|03|com|00|"; nocase;
within:5; classtype:misc-attack; sid:1600; rev:3;)

Paul D. Jaramillo
Security Event Management
Sprint Corporate Security
913-315-8036

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