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

Overview

Finding IDVersionRule IDIA ControlsSeverity
V-221015CISC-RT-000350SV-221015r945859_ruleCCI-002403medium
Description
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.
STIGDate
Cisco IOS XE Switch RTR Security Technical Implementation Guide2025-05-20

Related Frameworks

1 mapping across 3 frameworks
SCF0 mappings

No source states a mapping between these directly.

Also reachable in 3 hops (2) derived by us, not asserted by any source

Each of these is a route we composed by chaining published mappings. No publisher states a relationship between the two endpoints.

NET-03Boundary Protection
0.50
NET-04.1Deny Traffic by Default & Allow Traffic by Exception
0.50
NIST 800-530 mappings

No source states a mapping between these directly.

Also reachable in 2 hops (8) derived by us, not asserted by any source

Each of these is a route we composed by chaining published mappings. No publisher states a relationship between the two endpoints.

CM-6Configuration Settings
1.00
SC-24Fail in Known State
1.00
SC-47Alternate Communications Paths
1.00
SC-5Denial-of-service Protection
1.00
SC-7Boundary Protection
1.00
SC-7(11)Restrict Incoming Communications Traffic
1.00
SC-7(29)Separate Subnets to Isolate Functions
1.00
SC-7(5)Deny by Default — Allow by Exception
1.00
CCI1 mapping
CCI-002403
1.00

Details

Check Text (C-221015r945859_chk)

Review the switch configuration to determine if it will block all packets with IP options. ip access-list extended EXTERNAL_ACL permit tcp any any established deny ip any any option any-options permit … … … … deny ip any any log-input If the switch is not configured to drop all packets with IP options, this is a finding.

Fix Text (F-22719r408840_fix)

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