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Check: SRG-NET-000018-RTR-000002

Router SRG: SRG-NET-000018-RTR-000002 (in versions v5 r1 through v4 r1)

Title

The BGP router must be configured to reject inbound route advertisements for any Bogon prefixes. (Cat II impact)

Discussion

Accepting route advertisements for Bogon prefixes can result in the local autonomous system (AS) becoming a transit for malicious traffic as it will in turn advertise these prefixes to neighbor autonomous systems.

Check Content

Review the router configuration to verify that it will reject routes of any Bogon prefixes. The prefix filter must be referenced inbound on the appropriate BGP neighbor statements. If the router is not configured to reject inbound route advertisements for any Bogon prefixes, this is a finding.

Fix Text

Ensure all eBGP routers are configured to reject inbound route advertisements for any Bogon prefixes.

Additional Identifiers

Rule ID: SV-207098r604135_rule

Vulnerability ID: V-207098

Group Title: SRG-NET-000018

Expert Comments

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CCIs

CCIs tied to check.

Number	Definition
CCI-001368	Enforce approved authorizations for controlling the flow of information within the system based on organization-defined information flow control policies.

Controls

Controls tied to check. These are derived from the CCIs shown above.

Number	Title
AC-4	Information Flow Enforcement