V-206881

Discussion

The IPS must include protection against DoS attacks originating from inside the enclave that can affect either internal or external systems. These attacks may use legitimate or rogue endpoints from inside the enclave. Installation of IPS detection and prevention components (i.e., sensors) at key boundaries in the architecture mitigates the risk of DoS attacks. These attacks can be detected by matching observed communications traffic with patterns of known attacks and monitoring for anomalies in traffic volume/type. To comply with this requirement, the IPS must inspect outbound traffic for indications of known and unknown DoS attacks. Sensor log capacity management, along with techniques that prevent the logging of redundant information during an attack, also guard against DoS attacks. This requirement is used in conjunction with other requirements that require configuration of security policies, signatures, rules, and anomaly detection techniques and are applicable to both inbound and outbound traffic.

Check Content

If the device being reviews is an IDS, this is not applicable.

Verify the IPS blocks outbound traffic containing known and unknown DoS attacks by ensuring that security policies, signatures, rules, and anomaly detection techniques are applied to outbound communications traffic. 

If the IPS does not block outbound traffic containing known and unknown DoS attacks, by ensuring that security policies, signatures, rules, and anomaly detection techniques are applied to outbound communications traffic, this is a finding.