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The Cisco PE router must be configured to drop all packets with any IP options.


Overview

Finding ID Version Rule ID IA Controls Severity
V-96637 CISC-RT-000750 SV-105775r2_rule Medium
Description
Packets with IP options are not fast switched and therefore 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.
STIG Date
Cisco IOS Router RTR Security Technical Implementation Guide 2020-06-30

Details

Check Text ( C-95473r1_chk )
Review the router configuration to determine if it will drop all packets with IP options as shown below.

ip options drop

If the router is not configured to drop all packets with IP options, this is a finding.
Fix Text (F-102311r1_fix)
Configure the router to drop all packets with IP options as shown below.

R4(config)#ip options drop