STIGQter: STIG Summary: Network Infrastructure Policy Security Technical Implementation Guide Version: 9 Release: 10 Benchmark Date: 24 Jan 2020:

Protocol Independent Multicast (PIM) join messages received from a downstream multicast Designated Routers (DR) must be filtered for any reserved or any other undesirable multicast groups.

DISA Rule

SV-80865r1_rule

Vulnerability Number

V-66375

Group Title

NET2011

Rule Version

NET2011

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

RP routers that are peering with customer PIM-SM routers must implement a PIM import policy to block join messages for reserved and any undesirable multicast groups.

Check Contents

Verify that the RP router is configured to filter PIM join messages for any reserved multicast groups using the ip pim accept-rp global command as shown in the example below. The ip pim accept-rp global command causes the router to accept only (*, G) join messages destined for the specified RP address as allowed by the referenced access-list.

ip pim accept-rp 10.10.2.1 PIM_JOIN_FILTER
!
ip access-list standard PIM_JOIN_FILTER
deny 224.0.1.2
deny 224.0.1.3
deny 224.0.1.8
deny 224.0.1.22
deny 224.0.1.24
deny 224.0.1.25
...
...
...
deny 225.1.2.3
deny 229.55.150.208
deny 234.42.42.42 255.255.255.252
deny 239.0.0.0 0.255.255.255
permit any

Note: IOS 12.4T extends the ip multicast-routing command with a group-range or access-list argument that can be used to filter multicast control (PIM, IGMP) and data packets for unauthorized groups.

If the RP router peering with customer PIM-SM routers is not configured with a PIM import policy to block join messages for reserved and any undesirable multicast groups, this is a finding.

Vulnerability Number

V-66375

Documentable

False

Rule Version

NET2011

Severity Override Guidance

Verify that the RP router is configured to filter PIM join messages for any reserved multicast groups using the ip pim accept-rp global command as shown in the example below. The ip pim accept-rp global command causes the router to accept only (*, G) join messages destined for the specified RP address as allowed by the referenced access-list.

ip pim accept-rp 10.10.2.1 PIM_JOIN_FILTER
!
ip access-list standard PIM_JOIN_FILTER
deny 224.0.1.2
deny 224.0.1.3
deny 224.0.1.8
deny 224.0.1.22
deny 224.0.1.24
deny 224.0.1.25
...
...
...
deny 225.1.2.3
deny 229.55.150.208
deny 234.42.42.42 255.255.255.252
deny 239.0.0.0 0.255.255.255
permit any

Note: IOS 12.4T extends the ip multicast-routing command with a group-range or access-list argument that can be used to filter multicast control (PIM, IGMP) and data packets for unauthorized groups.

If the RP router peering with customer PIM-SM routers is not configured with a PIM import policy to block join messages for reserved and any undesirable multicast groups, this is a finding.

Check Content Reference

M

Target Key

838

Comments