Title

Proxy ARP must not be enabled on the system. (Cat II impact)

Discussion

Proxy ARP allows a system to respond to ARP requests on one interface on behalf of hosts connected to another interface. If this function is enabled when not required, addressing information may be leaked between the attached network segments.

Check Content

Determine if the system has non-local published ARP entries. Procedure: # arp -a If any entries have the flag P and no flag L, they are non-local published entries, and this is a finding.

Fix Text

Remove non-local published ARP entries from the system. Procedure: # arp -d <host> Check system initialization files for any commands creating published ARP entries (such as "arp -s <host> <ether> pub" or "arp -f") and removing them.

Additional Identifiers

Rule ID: SV-227801r603266_rule

Vulnerability ID: V-227801

Group Title: SRG-OS-000480

Expert Comments

CCIs tied to check.

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