Check: CISC-RT-000180
Cisco IOS XR Router RTR STIG:
CISC-RT-000180
(in versions v2 r4 through v1 r0.1)
Title
The Cisco router 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. Routers 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 router configuration and verify that ipv4 mask-reply command is not enabled on any external interfaces as shown in the example below. interface GigabitEthernet0/0/0/1 ipv4 address x.11.1.2 255.255.255.252 ipv4 mask-reply If the router configuration has the ipv4 mask-reply command is enabled on any external interfaces, this is a finding.
Fix Text
Disable ipv4 mask-reply on all external interfaces as shown below. RP/0/0/CPU0:R3(config)#int g0/0/0/1 RP/0/0/CPU0:R3(config-if)#no ipv4 mask-reply
Additional Identifiers
Rule ID: SV-216747r856438_rule
Vulnerability ID: V-216747
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 |