Check: CISC-RT-000750
Cisco IOS XE Switch RTR STIG:
CISC-RT-000750
(in versions v2 r5 through v1 r0.1)
Title
The Cisco PE switch must be configured to ignore or drop all packets with any IP options. (Cat II impact)
Discussion
Packets with IP options are not fast-switched and therefore must be punted to the switch processor. Hackers who initiate denial-of-service (DoS) attacks on switches commonly send large streams of packets with IP options. Dropping the packets with IP options reduces the load of IP options packets on the switch. The end result is a reduction in the effects of the DoS attack on the switch and on downstream switches.
Check Content
Review the switch configuration to determine if it will ignore or drop all packets with IP options as shown in the examples below: ip options drop or ip options ignore If the switch is not configured to drop or block all packets with IP options, this is a finding.
Fix Text
Configure the switch to ignore or drop all packets with IP options as shown in the examples below: SW1(config)#ip options ignore or SW1(config)#ip options drop
Additional Identifiers
Rule ID: SV-221049r856420_rule
Vulnerability ID: V-221049
Group Title: SRG-NET-000205-RTR-000016
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 |