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suricata/rules/ntp-events.rules

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# NTP app layer event rules
#
# SID's fall in the 2222000+ range. See https://redmine.openinfosecfoundation.org/projects/suricata/wiki/AppLayer
#
# These sigs fire at most once per connection.
#
alert ntp any any -> any any (msg:"SURICATA NTP malformed request data"; flow:to_server; app-layer-event:ntp.malformed_data; classtype:protocol-command-decode; sid:2222000; rev:1;)
alert ntp any any -> any any (msg:"SURICATA NTP malformed response data"; flow:to_client; app-layer-event:ntp.malformed_data; classtype:protocol-command-decode; sid:2222001; rev:1;)