I - Mission Critical Public
Rules and Groups employed by this XCCDF Profile
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SRG-NET-000362
<GroupDescription></GroupDescription>Group -
The BGP router must be configured to limit the prefix size on any inbound route advertisement to /24 or the least significant prefixes issued to the customer.
<VulnDiscussion>The effects of prefix de-aggregation can degrade router performance due to the size of routing tables and also result in blac...Rule Low Severity -
SRG-NET-000362
<GroupDescription></GroupDescription>Group -
The PE router must be configured to implement Internet Group Management Protocol (IGMP) or Multicast Listener Discovery (MLD) snooping for each Virtual Private LAN Services (VPLS) bridge domain.
<VulnDiscussion>IGMP snooping provides a way to constrain multicast traffic at Layer 2. By monitoring the IGMP membership reports sent by hos...Rule Low Severity -
SRG-NET-000362
<GroupDescription></GroupDescription>Group -
The multicast Rendezvous Point (RP) router must be configured to limit the multicast forwarding cache so that its resources are not saturated by managing an overwhelming number of Protocol Independent Multicast (PIM) and Multicast Source Discovery Protocol (MSDP) source-active entries.
<VulnDiscussion>MSDP peering between networks enables sharing of multicast source information. Enclaves with an existing multicast topology u...Rule Low Severity -
SRG-NET-000362
<GroupDescription></GroupDescription>Group -
The multicast Rendezvous Point (RP) must be configured to rate limit the number of Protocol Independent Multicast (PIM) Register messages.
<VulnDiscussion>When a new source starts transmitting in a PIM Sparse Mode network, the DR will encapsulate the multicast packets into regist...Rule Medium Severity -
SRG-NET-000362
<GroupDescription></GroupDescription>Group -
The multicast Designated Router (DR) must be configured to limit the number of mroute states resulting from Internet Group Management Protocol (IGMP) and Multicast Listener Discovery (MLD) Host Membership Reports.
<VulnDiscussion>The current multicast paradigm can let any host join any multicast group at any time by sending an IGMP or MLD membership rep...Rule Medium Severity -
SRG-NET-000362
<GroupDescription></GroupDescription>Group -
The multicast Designated Router (DR) must be configured to increase the shortest-path tree (SPT) threshold or set it to infinity to minimalize source-group (S, G) state within the multicast topology where Any Source Multicast (ASM) is deployed.
<VulnDiscussion>ASM can have many sources for the same groups (many-to-many). For many receivers, the path via the RP may not be ideal compar...Rule Medium Severity -
SRG-NET-000364
<GroupDescription></GroupDescription>Group -
The perimeter router must be configured to only allow incoming communications from authorized sources to be routed to authorized destinations.
<VulnDiscussion>Unrestricted traffic may contain malicious traffic that poses a threat to an enclave or to other connected networks. Addition...Rule Medium Severity -
SRG-NET-000364
<GroupDescription></GroupDescription>Group -
The perimeter router must be configured to block inbound packets with source Bogon IP address prefixes.
<VulnDiscussion>Bogons include IP packets on the public Internet that contain addresses that are not in any range allocated or delegated by t...Rule Medium Severity -
SRG-NET-000364
<GroupDescription></GroupDescription>Group -
The perimeter router must be configured to have Link Layer Discovery Protocols (LLDPs) disabled on all external interfaces.
<VulnDiscussion>LLDPs are primarily used to obtain protocol addresses of neighboring devices and discover platform capabilities of those devi...Rule Low Severity -
SRG-NET-000364
<GroupDescription></GroupDescription>Group -
The perimeter router must be configured to have Proxy ARP disabled on all external interfaces.
<VulnDiscussion>When Proxy ARP is enabled on a Cisco router, it allows that router to extend the network (at Layer 2) across multiple interfa...Rule Medium Severity
Node 2
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