The PE router must be configured to ignore or block all packets with any IP options.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-256061	ARST-RT-000840	SV-256061r945860_rule	CCI-002403	medium
Description
Packets with IP options are not fast routered 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
Arista MLS EOS 4.X Router Security Technical Implementation Guide			2025-02-20

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

DISA STIG Benchmark (XCCDF)V2R2intersects(normalised)
DISA CCI List2025-01-23equal to(normalised)
SCF Secure Traceability Relationship Mapping (STRM)2026.2intersects

NET-04.1Deny Traffic by Default & Allow Traffic by Exception

0.50

DISA STIG Benchmark (XCCDF)V2R2intersects(normalised)
DISA CCI List2025-01-23equal to(normalised)
SCF Secure Traceability Relationship Mapping (STRM)2026.2intersects

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

DISA STIG Benchmark (XCCDF)V2R2intersects(normalised)
DISA STIG Benchmark (XCCDF)3our copyintersects(normalised)
DISA STIG Benchmark (XCCDF)3intersects(normalised)
DISA CCI List2025-01-23equal to(normalised)

SC-24Fail in Known State

1.00

DISA STIG Benchmark (XCCDF)V2R2intersects(normalised)
DISA STIG Benchmark (XCCDF)V1R2our copyintersects(normalised)
DISA STIG Benchmark (XCCDF)V1R2intersects(normalised)
DISA CCI List2025-01-23equal to(normalised)

SC-47Alternate Communications Paths

1.00

DISA STIG Benchmark (XCCDF)V2R2intersects(normalised)
DISA STIG Benchmark (XCCDF)V2R1our copyintersects(normalised)
DISA STIG Benchmark (XCCDF)V2R1intersects(normalised)
DISA CCI List2025-01-23equal to(normalised)

SC-5Denial-of-service Protection

1.00

DISA STIG Benchmark (XCCDF)V2R2intersects(normalised)
DISA STIG Benchmark (XCCDF)V2R1our copyintersects(normalised)
DISA STIG Benchmark (XCCDF)V2R1intersects(normalised)
DISA CCI List2025-01-23equal to(normalised)

SC-7Boundary Protection

1.00

DISA STIG Benchmark (XCCDF)V2R2intersects(normalised)
DISA STIG Benchmark (XCCDF)V1R2our copyintersects(normalised)
DISA STIG Benchmark (XCCDF)V1R2intersects(normalised)
DISA CCI List2025-01-23equal to(normalised)

SC-7(11)Restrict Incoming Communications Traffic

1.00

DISA STIG Benchmark (XCCDF)V2R2intersects(normalised)
DISA CCI List2025-01-23equal to(normalised)

SC-7(29)Separate Subnets to Isolate Functions

1.00

DISA STIG Benchmark (XCCDF)V2R2intersects(normalised)
DISA STIG Benchmark (XCCDF)V3R4our copyintersects(normalised)
DISA STIG Benchmark (XCCDF)V3R4intersects(normalised)
DISA CCI List2025-01-23equal to(normalised)

SC-7(5)Deny by Default — Allow by Exception

1.00

DISA STIG Benchmark (XCCDF)V2R2intersects(normalised)
DISA STIG Benchmark (XCCDF)V1R2our copyintersects(normalised)
DISA STIG Benchmark (XCCDF)V1R2intersects(normalised)
DISA CCI List2025-01-23equal to(normalised)

CCI1 mapping

CCI-002403

1.00

DISA STIG Benchmark (XCCDF)V2R2intersects(normalised)

Details

Check Text (C-256061r945860_chk)

Verify the PE router is configured to block all packets with any IP options with the following command: router#show run | section IP_Option_ACL IP Access List IP_Option_ACL 10 deny ip any any ip-length gt 5 20 deny any log ! interface Ethernet25 description STIG_IP_Option_ACL ip access-group IP_Option_ACL in ! If the perimeter router is not configured to block packets with IP options, this is a finding.

Fix Text (F-59680r882524_fix)

Configure the PE router to block packets with IP options with the following commands: router#config router(config)# ip access-list IP_Option_ACL 10 deny ip any any ip-length gt 5 ! router(config)#interface Ethernet25 ip access-group IP_Option_ACL in !