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

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-216812r531087_rule

Vulnerability Number

V-216812

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

10

Fix Recommendation

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

RP/0/0/CPU0:R2(config)#ipv4 access-list FILTER_PIM_JOINS
RP/0/0/CPU0:R2(config-ipv4-acl)#deny 239.8.0.0 0.0.255.255
RP/0/0/CPU0:R2(config-ipv4-acl)#permit any
RP/0/0/CPU0:R2(config-ipv4-acl)#exit
RP/0/0/CPU0:R2(config)#router pim
RP/0/0/CPU0:R2(config-pim)#address-family ipv4
RP/0/0/CPU0:R2(config-pim-default-ipv4)#allow-rp group-list FILTER_PIM_JOINS
RP/0/0/CPU0:R2(config-pim-default-ipv4)#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 no allowed.

ipv4 access-list FILTER_PIM_JOINS
10 deny ipv4 239.8.0.0 0.0.255.255 any
20 permit ipv4 any any
…
…
…
router pim
address-family ipv4
allow-rp group-list FILTER_PIM_JOINS

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

Vulnerability Number

V-216812

Documentable

False

Rule Version

CISC-RT-000840

Severity Override Guidance

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 no allowed.

ipv4 access-list FILTER_PIM_JOINS
10 deny ipv4 239.8.0.0 0.0.255.255 any
20 permit ipv4 any any
…
…
…
router pim
address-family ipv4
allow-rp group-list FILTER_PIM_JOINS

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

Check Content Reference

M

Target Key

4029

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