The Cisco Multicast Source Discovery Protocol (MSDP) switch must be configured to only accept MSDP packets from known MSDP peers.
An XCCDF Rule
Description
<VulnDiscussion>MSDP peering with customer network switches presents additional risks to the DISN Core, whether from a rogue or misconfigured MSDP-enabled switch. To guard against an attack from malicious MSDP traffic, the receive path or interface filter for all MSDP-enabled RP switches must be configured to only accept MSDP packets from known MSDP peers.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls>
- ID
- SV-221064r856427_rule
- Severity
- Medium
- References
- Updated
Remediation - Manual Procedure
Configure the receive path or interface ACLs to only accept MSDP packets from known MSDP peers.
SW1(config)#ip access-list extended EXTERNAL_ACL_INBOUND
SW1(config-ext-nacl)#permit tcp any any established
SW1(config-ext-nacl)#permit tcp host x.1.28.2 host x.1.28.8 eq 639
SW1(config-ext-nacl)#deny tcp any host x1.28.8 eq 639