Title

The ALG must behave in a predictable and documented manner that reflects organizational and system objectives when invalid inputs are received. (Cat II impact)

Discussion

A common vulnerability of network elements is unpredictable behavior when invalid inputs are received. This requirement guards against adverse or unintended system behavior caused by invalid inputs, where information system responses to the invalid input may be disruptive or cause the system to fail into an unsafe state. The behavior will be derived from the organizational and system requirements and includes, but is not limited to, notification of the appropriate personnel, creating an audit record, and rejecting invalid input. This requirement applies to gateways and firewalls that perform content inspection or have higher-layer proxy functions.

Check Content

Verify the ALG behaves in a predictable and documented manner that reflects organizational and system objectives when invalid inputs are received. If the ALG does not behave in a predictable and documented manner that reflects organizational and system objectives when invalid inputs are received, this is a finding.

Fix Text

Configure the ALG to behave in a predictable and documented manner that reflects organizational and system objectives when invalid inputs are received.

Additional Identifiers

Rule ID: SV-68893r1_rule

Vulnerability ID: V-54647

Group Title: SRG-NET-000380-ALG-000128

Expert Comments

CCIs tied to check.

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