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The Cisco ASA must be configured to implement scanning threat detection.


Finding ID Version Rule ID IA Controls Severity
V-239864 CASA-FW-000220 SV-239864r863231_rule High
In a port scanning attack, an unauthorized application is used to scan the host devices for available services and open ports for subsequent use in an attack. This type of scanning can be used as a DoS attack when the probing packets are sent excessively.
Cisco ASA Firewall Security Technical Implementation Guide 2022-09-12


Check Text ( C-43097r863230_chk )
NOTE: When operating the ASA in multi-context mode with a separate IDPS, threat detection cannot be enabled, and this check is Not Applicable.

Review the ASA configuration to determine if scanning threat detection has been enabled.

threat-detection scanning-threat shun

NOTE: The parameter 'shun' is an optional parameter, and not required, but can offer additional protection by dropping further connections from the threat.

If the ASA has not been configured to enable scanning threat detection, this is a finding.
Fix Text (F-43056r665877_fix)
Configure scanning threat detection as shown in the example below.

ASA(config)# threat-detection scanning-threat shun