Check: CISC-RT-000180
Cisco IOS XE Switch RTR STIG:
CISC-RT-000180
(in versions v2 r5 through v1 r0.1)
Title
The Cisco switch must be configured to have Internet Control Message Protocol (ICMP) mask reply messages disabled on all external interfaces. (Cat II impact)
Discussion
The ICMP supports IP traffic by relaying information about paths, routes, and network conditions. Switches automatically send ICMP messages under a wide variety of conditions. Mask Reply ICMP messages are commonly used by attackers for network mapping and diagnosis.
Check Content
Review the switch configuration and verify that ip mask-reply command is not enabled on any external interfaces as shown in the example below: interface GigabitEthernet0/1 ip address x.x.x.x 255.255.255.0 ip mask-reply If the ip mask-reply command is configured on any external interface, this is a finding.
Fix Text
Disable ip mask-reply on all external interfaces as shown below: SW1(config)#int g0/1 SW1(config-if)#no ip mask-reply
Additional Identifiers
Rule ID: SV-221001r856406_rule
Vulnerability ID: V-221001
Group Title: SRG-NET-000362-RTR-000114
Expert Comments
CCIs
Number | Definition |
---|---|
CCI-002385 |
The information system protects against or limits the effects of organization-defined types of denial of service attacks by employing organization-defined security safeguards. |
Controls
Number | Title |
---|---|
SC-5 |
Denial Of Service Protection |