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Cisco Intrusion Prevention System CLI Sensor Configuration Guide for IPS 7.1
OL-19892-01
Chapter 8 Defining Signatures
Configuring Signatures
For More Information
For the procedure for enabling signatures, see Configuring the Status of Signatures, page 8-13.
Creating an AIC Signature
Caution A custom signature can affect the performance of your sensor. Test the custom signature against a
baseline sensor performance for your network to determine the overall impact of the signature.
The following example demonstrates how to create a MIME-type signature based on the AIC engine.
The following options apply:
• event-action—Specifies the action(s) to perform when alert is triggered:
–
deny-attacker-inline (inline only)—Does not transmit this packet and future packets from the
attacker address for a specified period of time.
–
deny-attacker-service-pair-inline (inline only)—Does not transmit this packet and future
packets on the attacker address victim port pair for a specified period of time.
–
deny-attacker-victim-pair-inline (inline only)—Does not transmit this packet and future
packets on the attacker/victim address pair for a specified period of time.
–
deny-connection-inline (inline only)—Does not transmit this packet and future packets on the
TCP flow.
–
deny-packet-inline (inline only)—Does not transmit this packet.
–
log-attacker-packets—Starts IP logging of packets containing the attacker address.
–
log-pair-packets—Starts IP logging of packets containing the attacker-victim address pair.
–
log-victim-packets—Starts IP logging of packets containing the victim address.
–
produce-alert —Writes the event to the Event Store as an alert.
–
produce-verbose-alert—Includes an encoded dump (possibly truncated) of the offending
packet in the alert.
–
request-block-connection—Sends a request to the ARC to block this connection.
–
request-block-host—Sends a request to the ARC to block this attacker host.
–
request-rate-limit—Sends a rate limit request to the ARC to perform rate limiting.
–
request-snmp-trap—Sends a request to the Notification Application component of the sensor
to perform SNMP notification.
–
reset-tcp-connection—Sends TCP resets to hijack and terminate the TCP flow.
12930 Define FTP command stru
12931 Define FTP command syst
12932 Define FTP command type
12933 Define FTP command user
Table 8-4 FTP Commands Signatures (continued)
Signature ID FTP Command