Check: SRG-NET-000205-RTR-000016
Router SRG:
SRG-NET-000205-RTR-000016
(in versions v4 r3 through v4 r1)
Title
The PE router must be configured to ignore or block all packets with any IP options. (Cat II impact)
Discussion
Packets with IP options are not fast switched and therefore must be punted to the router processor. Hackers who initiate denial-of-service (DoS) attacks on routers commonly send large streams of packets with IP options. Dropping the packets with IP options reduces the load of IP options packets on the router. The end result is a reduction in the effects of the DoS attack on the router and on downstream routers.
Check Content
Review the router configuration to determine if it will block all packets with IP options. If the router is not configured to drop all packets with IP options, this is a finding.
Fix Text
Configure the router to drop all packets with IP options.
Additional Identifiers
Rule ID: SV-216981r945860_rule
Vulnerability ID: V-216981
Group Title: SRG-NET-000205
Expert Comments
CCIs
| Number | Definition |
|---|---|
| CCI-001097 |
The information system monitors and controls communications at the external boundary of the information system and at key internal boundaries within the system. |
| CCI-002403 |
The information system only allows incoming communications from organization-defined authorized sources routed to organization-defined authorized destinations. |