Check: CISC-RT-000350
Cisco IOS XR Router RTR STIG:
CISC-RT-000350
(in versions v2 r4 through v1 r0.1)
Title
The Cisco perimeter router must be configured to block all packets with any IP options. (Cat II impact)
Discussion
Packets with IP options are not fast switched and henceforth must be punted to the router processor. Hackers who initiate denial-of-service (DoS) attacks on routers commonly send large streams of packets with IP options. Dropping the packets with IP options reduces the load of IP options packets on the router. The end result is a reduction in the effects of the DoS attack on the router and on downstream routers.
Check Content
This requirement is not applicable for the DODIN Backbone. In Cisco IOS XR, all IPv4 packets with any header option other than the "source-route" header options are dropped. By default, ipv4 source routing is disabled. Verify that the following command is not configured: ipv4 source-route If the router is not configured to drop all packets with IP option source routing, this is a finding.
Fix Text
This requirement is not applicable for the DODIN Backbone. Configure the router to drop all packets with IP option source routing. RP/0/0/CPU0:R3(config)#no ipv4 source-route
Additional Identifiers
Rule ID: SV-217006r856461_rule
Vulnerability ID: V-217006
Group Title: SRG-NET-000205-RTR-000015
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 |