JUNI-RT-000382 - The Juniper perimeter router must be configured drop IPv6 packets with a Routing Header type 0, 1, or 3255.

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Information

The routing header can be used maliciously to send a packet through a path where less robust security is in place, rather than through the presumably preferred path of routing protocols. Use of the routing extension header has few legitimate uses other than as implemented by Mobile IPv6.

The Type 0 Routing Header (RFC 5095) is dangerous because it allows attackers to spoof source addresses and obtain traffic in response, rather than the real owner of the address. Secondly, a packet with an allowed destination address could be sent through a Firewall using the Routing Header functionality, only to bounce to a different node once inside. The Type 1 Routing Header is defined by a specification called 'Nimrod Routing', a discontinued project funded by DARPA. Assuming that most implementations will not recognize the Type 1 Routing Header, it must be dropped. The Type 3-255 Routing Header values in the routing type field are currently undefined and should be dropped inbound and outbound.

Solution

Step 1: Configure a filter to block packets with a routing header as shown in the example.

user@R1# edit firewall family inet6
user@R1# edit filter IPV6-INGRESS-FILTER
user@R1# set term ROUTING_HEADER from next-header routing
user@R1# set term ROUTING_HEADER then discard syslog
user@R1# top

Step 2: Apply the filter inbound on all external IPv6-enabled interfaces.

user@R1# edit interfaces ge-0/0/0 unit 0 family inet6
user@R1# set filter input IPV6-INGRESS-FILTER
user@R1# commit

See Also

https://dl.dod.cyber.mil/wp-content/uploads/stigs/zip/U_Juniper_Router_Y21M02_STIG.zip

Item Details

References: CAT|II, CCI|CCI-002403, Rule-ID|SV-233294r639663_rule, STIG-ID|JUNI-RT-000382, Vuln-ID|V-233294

Plugin: Juniper

Control ID: d591549dd300f903903ef85e79d1d8717cdbffb913acaee964f90952b727fc7b