STIGQter STIGQter: STIG Summary: Cisco IOS Router RTR Security Technical Implementation Guide Version: 2 Release: 1 Benchmark Date: 23 Oct 2020:

The Cisco multicast edge router must be configured to establish boundaries for administratively scoped multicast traffic.

DISA Rule

SV-216624r531085_rule

Vulnerability Number

V-216624

Group Title

SRG-NET-000019-RTR-000005

Rule Version

CISC-RT-000810

Severity

CAT III

CCI(s)

Weight

10

Fix Recommendation

Step 1: Configure the ACL to deny packets with multicast administratively scoped destination addresses as shown in the example below.

R2(config)#ip access-list standard MULTICAST_SCOPE
R2(config-std-nacl)#deny 239.0.0.0 0.255.255.255
R2(config-std-nacl)#permit any
R2(config-std-nacl)#exit

Step 2: Apply the multicast boundary at the appropriate interfaces as shown in the example below.

R2(config)#int g1/2
R2(config-if)#ip multicast boundary MULTICAST_SCOPE
R2(config-if)#end

Check Contents

Review the router configuration and verify that admin-scope multicast traffic is blocked at the external edge as shown in the example below.

interface GigabitEthernet1/2
ip address x.1.12.2 255.255.255.252
ip pim sparse-mode
ip multicast boundary MULTICAST_SCOPE



ip access-list standard MULTICAST_SCOPE
deny 239.0.0.0 0.255.255.255
permit any

If the router is not configured to establish boundaries for administratively scoped multicast traffic, this is a finding.

Vulnerability Number

V-216624

Documentable

False

Rule Version

CISC-RT-000810

Severity Override Guidance

Review the router configuration and verify that admin-scope multicast traffic is blocked at the external edge as shown in the example below.

interface GigabitEthernet1/2
ip address x.1.12.2 255.255.255.252
ip pim sparse-mode
ip multicast boundary MULTICAST_SCOPE



ip access-list standard MULTICAST_SCOPE
deny 239.0.0.0 0.255.255.255
permit any

If the router is not configured to establish boundaries for administratively scoped multicast traffic, this is a finding.

Check Content Reference

M

Target Key

4027

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