Title

The router must be configured to produce audit records containing information to establish where the events occurred. (Cat II impact)

Discussion

Without establishing where events occurred, it is impossible to establish, correlate, and investigate the events leading up to an outage or attack. In order to compile an accurate risk assessment and provide forensic analysis, it is essential for security personnel to know where events occurred, such as router components, modules, device identifiers, node names, and functionality. Associating information about where the event occurred within the network provides a means of investigating an attack, recognizing resource utilization or capacity thresholds, or identifying an improperly configured router.

Check Content

The router must log all packets that have been dropped via the access control list (ACL). If the router fails to log all packets that have been dropped via the ACL, this is a finding. Log output must contain an interface name as to where the packet was filtered. If the logged output does not contain an interface name as to where the packet was filtered, this is a finding.

Fix Text

Configure the router to record the interface in the log record for packets being dropped.

Additional Identifiers

Rule ID: SV-207120r604135_rule

Vulnerability ID: V-207120

Group Title: SRG-NET-000076

Expert Comments

CCIs tied to check.

Controls tied to check. These are derived from the CCIs shown above.