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V-101645

The Cisco perimeter switch must be configured to have Proxy ARP disabled on all external interfaces.

Finding ID
CISC-RT-000380
Rule ID
SV-110749r1_rule
Severity
Cat II
CCE
(None)
Group Title
SRG-NET-000364-RTR-000112
CCI
CCI-002403
Target Key
(None)
Documentable
No
Discussion

When Proxy ARP is enabled on a switch, it allows that switch to extend the network (at Layer 2) across multiple interfaces (LAN segments). Because proxy ARP allows hosts from different LAN segments to look like they are on the same segment, proxy ARP is only safe when used between trusted LAN segments. Attackers can leverage the trusting nature of proxy ARP by spoofing a trusted host and then intercepting packets. Proxy ARP should always be disabled on switch interfaces that do not require it unless the switch is being used as a LAN bridge.

Fix Text

Disable Proxy ARP on all external interfaces as shown in the example below: SW1(config)#int g0/1 SW1(config-if)#no ip proxy-arp

Check Content

Review the switch configuration to determine if IP Proxy ARP is disabled on all external interfaces as shown in the example below: interface GigabitEthernet0/1 description link to DISN ip address x.1.12.2 255.255.255.252 no ip proxy-arp Note: By default, Proxy ARP is enabled on all interfaces; hence, if enabled, it will not be shown in the configuration. If IP Proxy ARP is enabled on any external interface, this is a finding.