Detections
Analytics

1.26 CISC-RT-000350

Information

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

GROUP ID: V-221015
RULE ID: SV-221015r945859

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 options.

SW1(config)#ip access-list extended EXTERNAL_ACL
SW1(config-ext-nacl)#15 deny ip any any option any-options

See Also

https://workbench.cisecurity.org/benchmarks/26260

Item Details

Category: SYSTEM AND COMMUNICATIONS PROTECTION

References: 800-53|SC-7(11), CAT|II, CCI|CCI-002403, Rule-ID|SV-221015r945859_rule, STIG-ID|CISC-RT-000350, Vuln-ID|V-221015

Plugin: Cisco

Control ID: 3efb23dee3410e4a9d2b6e8f5f563660745fbcb395fc6287dccffa56f0ec5842