AMLS-L3-000130 - The Arista Multilayer Switch must establish boundaries for IPv6 Admin-Local, IPv6 Site-Local, IPv6 Organization-Local scope, and IPv4 Local-Scope multicast traffic.

Information

If multicast traffic is forwarded beyond the intended boundary, it is possible that it can be intercepted by unauthorized or unintended personnel.

Administrative scoped multicast addresses are locally assigned and are to be used exclusively by the enterprise network or enclave. Administrative scoped multicast traffic must not cross the enclave perimeter in either direction. Restricting multicast traffic makes it more difficult for a malicious user to access sensitive traffic.

Admin-Local scope is encouraged for any multicast traffic within a network intended for network management, as well as for control plane traffic that must reach beyond link-local destinations.

NOTE: Nessus has not performed this check. Please review the benchmark to ensure target compliance.

Solution

Configure the appropriate boundaries to contain packets addressed within the administratively scoped zone. Defined multicast addresses are FFx4::/16, FFx5::/16, FFx8::/16, and 239.255.0.0/16.

To create a PIM Boundary, create an access list by entering:

ip access-list [name]
[ip access list permit/deny statement]
exit

Then apply the boundary filter based on the accesslist to the PIM-enabled interface:

int ethernet [X]
ip multicast boundary [name-of-ACL]

See Also

https://dl.dod.cyber.mil/wp-content/uploads/stigs/zip/U_Arista_MLS_DCS-7000_Series_Y24M07_STIG.zip

Item Details

Category: ACCESS CONTROL

References: 800-53|AC-4, CAT|II, CCI|CCI-001414, Rule-ID|SV-217491r382735_rule, STIG-ID|AMLS-L3-000130, STIG-Legacy|SV-75351, STIG-Legacy|V-60893, Vuln-ID|V-217491

Plugin: Arista

Control ID: 1fbc6b0837d02ef77c705f4dfc4e2e924b4a07a905230c531a28293ed158f257