Title

IP forwarding for IPv4 must not be enabled, unless the system is a router. (Cat II impact)

Discussion

If the system is configured for IP forwarding and is not a designated router, it could be used to bypass network security by providing a path for communication not filtered by network devices.

Check Content

Determine if the system is configured for IPv4 forwarding. # svcs | grep svc:/network/ipv4-forwarding If the service is enabled, this is a finding.

Fix Text

Disable IPv4 forwarding on the system. # svcadm disable svc:/network/ipv4-forwarding

Additional Identifiers

Rule ID: SV-220109r603266_rule

Vulnerability ID: V-220109

Group Title: SRG-OS-000480

Expert Comments

CCIs tied to check.

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