Check: CISC-RT-000380
Cisco IOS XE Switch RTR STIG:
CISC-RT-000380
(in versions v2 r5 through v1 r0.1)
Title
The Cisco perimeter switch must be configured to have Proxy ARP disabled on all external interfaces. (Cat II impact)
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.
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.
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
Additional Identifiers
Rule ID: SV-221018r856413_rule
Vulnerability ID: V-221018
Group Title: SRG-NET-000364-RTR-000112
Expert Comments
CCIs
Number | Definition |
---|---|
CCI-002403 |
The information system only allows incoming communications from organization-defined authorized sources routed to organization-defined authorized destinations. |
Controls
Number | Title |
---|---|
SC-7 (11) |
Restrict Incoming Communications Traffic |