The Juniper multicast Rendezvous Point (RP) router must be configured to filter Protocol Independent Multicast (PIM) Join messages received from the Designated Juniper router (DR) for any undesirable multicast groups.
An XCCDF Rule
Description
<VulnDiscussion>Real-time multicast traffic can entail multiple large flows of data. An attacker can flood a network segment with multicast packets, over-using the available bandwidth and thereby creating a denial-of-service (DoS) condition. Hence, it is imperative that join messages are only accepted for authorized multicast groups and sources.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls>
- ID
- SV-217087r604135_rule
- Severity
- Low
- References
- Updated
Remediation - Manual Procedure
RP routers that are peering with customer PIM-SM routers must implement a PIM import policy to block join messages for any undesirable multicast groups.
Step 1: Configure a multicast join policy to filter bad groups and sources as shown in the example below:
[edit policy-options policy-statement MULTICAST_JOIN_POLICY]
set term BAD_GROUPS from route-filter 224.1.1.0/24 orlonger