STIGQter: STIG Summary: Cisco IOS XE Router RTR Security Technical Implementation Guide Version: 2 Release: 2 Benchmark Date: 23 Apr 2021:

The Cisco multicast Rendezvous Point (RP) router must be configured to filter Protocol Independent Multicast (PIM) Join messages received from the Designated Router (DR) for any undesirable multicast groups.

DISA Rule

SV-216722r531086_rule

Vulnerability Number

V-216722

Group Title

SRG-NET-000019-RTR-000014

Rule Version

CISC-RT-000840

Severity

CAT III

CCI(s)

CCI-001414 - The information system enforces approved authorizations for controlling the flow of information between interconnected systems based on organization-defined information flow control policies.

Weight

Fix Recommendation

Configure the RP to filter PIM join messages for any undesirable multicast groups as shown in the example below:

R2(config)#ip access-list standard PIM_JOIN_FILTER
R2(config-std-nacl)#deny 239.8.0.0 0.0.255.255
R2(config-std-nacl)#permit any
R2(config-std-nacl)#exit
R2(config)#ip pim accept-rp 10.2.2.2 PIM_JOIN_FILTER
R2(config)#end

Check Contents

Verify that the RP router is configured to filter PIM join messages for any undesirable multicast groups. In the example below, groups from 239.8.0.0/16 are not allowed.

ip pim rp-address 10.2.2.2
ip pim accept-rp 10.2.2.2 FILTER_PIM_JOINS
…
…
…
ip access-list standard FILTER_PIM_JOINS
deny 239.8.0.0 0.0.255.255
permit any
!

If the RP is not configured to filter join messages received from the DR for any undesirable multicast groups, this is a finding.

The Cisco multicast Rendezvous Point (RP) router must be configured to filter Protocol Independent Multicast (PIM) Join messages received from the Designated Router (DR) for any undesirable multicast groups.

DISA Rule

Vulnerability Number

Group Title

Rule Version

Severity

CCI(s)

Weight

Fix Recommendation

Check Contents

Vulnerability Number

Documentable

Rule Version

Severity Override Guidance

Check Content Reference

Target Key

Comments