Detections
Analytics

1.22 CISC-RT-000350

Information

The Cisco perimeter switch must be configured to block all packets with any IP options.

GROUP ID: V-221095
RULE ID: SV-221095r999704

Packets with IP options are not fast switched and henceforth 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.

Solution

Configure the switch to drop all packets with IP option source routing.

SW1(config)# no ip source-route
SW1(config)# end

See Also

https://workbench.cisecurity.org/benchmarks/26426

Item Details

Category: SECURITY ASSESSMENT AND AUTHORIZATION, SYSTEM AND COMMUNICATIONS PROTECTION

References: 800-53|CA-9, 800-53|SC-7, 800-53|SC-7(5), 800-53|SC-7(11), CSCv7|12.4, Rule-ID|SV-221095r999704_rule, STIG-ID|CISC-RT-000350, Vuln-ID|V-221095

Plugin: Cisco

Control ID: 304211493368dd278d85ec3f3b8ceedc6d054c182bac66d6a872c10af27de2f5