Detections
Analytics

1.36 CISC-RT-000394

Information

The Cisco perimeter router must be configured to drop IPv6 packets containing a Hop-by-Hop header with invalid option type values.

GROUP ID: V-230147RULE ID: SV-230147r856667

These options are intended to be for the Destination Options header only. The optional and extensible natures of the IPv6 extension headers require higher scrutiny since many implementations do not always drop packets with headers that it cannot recognize and hence could cause a Denial-of-Service on the target device. In addition, the type, length, value (TLV) formatting provides the ability for headers to be very large.

NOTE: Nessus has provided the target output to assist in reviewing the benchmark to ensure target compliance.

Solution

Drop IPv6 packets containing a Hop-by-Hop header as shown in the example below.

RP/0/0/CPU0:R3(config)# ipv6 access-list FILTER_IPV6RP/0/0/CPU0:R3(config-ipv6-acl)# deny hbh any any dest-option-type 4 logRP/0/0/CPU0:R3(config-ipv6-acl)# deny hbh any any dest-option-type 195 logRP/0/0/CPU0:R3(config-ipv6-acl)# deny hbh any any dest-option-type home-address logRP/0/0/CPU0:R3(config-ipv6-acl)# permit ipv6 ............RP/0/0/CPU0:R3(config-ipv6-acl)# deny ipv6 any any logRP/0/0/CPU0:R3(config-ipv6-acl)# exitRP/0/0/CPU0:R3(config)# interface gigabitethernet 0/2/0/2RP/0/0/CPU0:R3(config-if)# ipv6 access-group FILTER_IPV6 ingressRP/0/0/CPU0:R3(config-if)# end

See Also

https://workbench.cisecurity.org/benchmarks/23599

Item Details

Category: SYSTEM AND COMMUNICATIONS PROTECTION

References: 800-53|SC-7(11), CAT|II, CCI|CCI-002403, Rule-ID|SV-230147r856667_rule, STIG-ID|CISC-RT-000394, Vuln-ID|V-230147

Plugin: Cisco

Control ID: 675342b2c70c8b9db3985fd99ccb66820423b44b01844f2af6346a136a54b090