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Check: SRG-NET-000364-RTR-000200

Router SRG: SRG-NET-000364-RTR-000200 (in versions v4 r3 through v4 r1)

Title

The perimeter router must be configured to drop IPv6 undetermined transport packets. (Cat II impact)

Discussion

One of the fragmentation weaknesses known in IPv6 is the undetermined transport packet. This packet contains an undetermined protocol due to fragmentation. Depending on the length of the IPv6 extension header chain, the initial fragment may not contain the layer four port information of the packet.

Check Content

This requirement is not applicable for the DODIN Backbone. Review the router configuration to determine if it is configured to drop IPv6 undetermined transport packets. If the router is not configured to drop IPv6 undetermined transport packets, this is a finding.

Fix Text

Configure the router to drop IPv6 undetermined transport packets.

Additional Identifiers

Rule ID: SV-220147r950991_rule

Vulnerability ID: V-220147

Group Title: SRG-NET-000364

Expert Comments

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CCIs

CCIs tied to check.

Number	Definition
CCI-002403	The information system only allows incoming communications from organization-defined authorized sources routed to organization-defined authorized destinations.

Controls

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

Number	Title
SC-7 (11)	Restrict Incoming Communications Traffic