The ALG providing user authentication intermediary services must require users to reauthenticate when organization-defined circumstances or situations require reauthentication.

Severity	Group ID	Group Title	Version	Rule ID	Date	STIG Version
medium	V-204997	SRG-NET-000337	SRG-NET-000337-ALG-000096	SV-204997r1050784_rule	2024-12-04	2

Description
Without reauthentication, users may access resources or perform tasks for which they do not have authorization. In addition to the reauthentication requirements associated with session locks, organizations may require reauthentication of individuals and/or devices in other situations, including (but not limited to) the following circumstances: 1) When authenticators change. 2) When roles change. 3) When security categories of information systems change. 4) When the execution of privileged functions occurs. 5) After a fixed period of time. 6) Periodically. Within the DOD, the minimum circumstances requiring reauthentication are privilege escalation and role changes. This requirement only applies to components for which this is specific to the function of the device or has the concept of user authentication (e.g., VPN or ALG capability). This does not apply to authentication for the purpose of configuring the device itself (i.e., device management).

Description

Without reauthentication, users may access resources or perform tasks for which they do not have authorization. In addition to the reauthentication requirements associated with session locks, organizations may require reauthentication of individuals and/or devices in other situations, including (but not limited to) the following circumstances: 1) When authenticators change. 2) When roles change. 3) When security categories of information systems change. 4) When the execution of privileged functions occurs. 5) After a fixed period of time. 6) Periodically. Within the DOD, the minimum circumstances requiring reauthentication are privilege escalation and role changes. This requirement only applies to components for which this is specific to the function of the device or has the concept of user authentication (e.g., VPN or ALG capability). This does not apply to authentication for the purpose of configuring the device itself (i.e., device management).

ℹ️ Check
If the ALG does not provide user authentication intermediary services, this is not applicable. Verify the ALG is configured to require users to reauthenticate when organization-defined circumstances or situations require reauthentication. If the ALG does not require users to reauthenticate when organization-defined circumstances or situations require reauthentication, this is a finding.

✔️ Fix
If user access control intermediary services are provided, configure the ALG to require users to reauthenticate when organization-defined circumstances or situations require reauthentication.