Router Security Requirements Guide
Rules, Groups, and Values defined within the XCCDF Benchmark
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SRG-NET-000018
<GroupDescription></GroupDescription>Group -
The BGP router must be configured to reject inbound route advertisements for any Bogon prefixes.
<VulnDiscussion>Accepting route advertisements for Bogon prefixes can result in the local autonomous system (AS) becoming a transit for malic...Rule Medium Severity -
SRG-NET-000018
<GroupDescription></GroupDescription>Group -
The BGP router must be configured to reject inbound route advertisements for any prefixes belonging to the local autonomous system (AS).
<VulnDiscussion>Accepting route advertisements belonging to the local AS can result in traffic looping or being black holed, or at a minimum ...Rule Medium Severity -
SRG-NET-000018
<GroupDescription></GroupDescription>Group -
The BGP router must be configured to reject inbound route advertisements from a customer edge (CE) router for prefixes that are not allocated to that customer.
<VulnDiscussion>As a best practice, a service provider should only accept customer prefixes that have been assigned to that customer and any ...Rule Medium Severity -
SRG-NET-000018
<GroupDescription></GroupDescription>Group -
The BGP router must be configured to reject outbound route advertisements for any prefixes that do not belong to any customers or the local autonomous system (AS).
<VulnDiscussion>Advertisement of routes by an autonomous system for networks that do not belong to any of its customers pulls traffic away fr...Rule Medium Severity -
SRG-NET-000018
<GroupDescription></GroupDescription>Group -
The BGP router must be configured to reject route advertisements from BGP peers that do not list their autonomous system (AS) number as the first AS in the AS_PATH attribute.
<VulnDiscussion>Verifying the path a route has traversed will ensure the IP core is not used as a transit network for unauthorized or possibl...Rule Low Severity -
SRG-NET-000018
<GroupDescription></GroupDescription>Group -
The Multicast Source Discovery Protocol (MSDP) router must be configured to filter received source-active multicast advertisements for any undesirable multicast groups and sources.
<VulnDiscussion>The interoperability of BGP extensions for interdomain multicast routing and MSDP enables seamless connectivity of multicast ...Rule Low Severity -
SRG-NET-000018
<GroupDescription></GroupDescription>Group -
The Multicast Source Discovery Protocol (MSDP) router must be configured to filter source-active multicast advertisements to external MSDP peers to avoid global visibility of local-only multicast sources and groups.
<VulnDiscussion>To avoid global visibility of local information, there are a number of source-group (S, G) states in a PIM-SM domain that mus...Rule Low Severity -
SRG-NET-000018
<GroupDescription></GroupDescription>Group -
The MSDP router must be configured to limit the amount of source-active messages it accepts on per-peer basis.
<VulnDiscussion>To reduce any risk of a denial-of-service (DoS) attack from a rogue or misconfigured MSDP router, the router must be configur...Rule Low Severity -
SRG-NET-000018
<GroupDescription></GroupDescription>Group -
The BGP router must be configured to reject route advertisements from CE routers with an originating AS in the AS_PATH attribute that does not belong to that customer.
<VulnDiscussion>Verifying the path a route has traversed will ensure that the local AS is not used as a transit network for unauthorized traf...Rule Low Severity -
SRG-NET-000019
<GroupDescription></GroupDescription>Group -
The router must be configured to disable the auxiliary port unless it is connected to a secured modem providing encryption and authentication.
<VulnDiscussion>The use of POTS lines to modems connecting to network devices provides clear text of authentication traffic over commercial c...Rule Low Severity
Node 2
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