Detections
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JUNI-RT-000384 - The Juniper perimeter router must be configured to drop IPv6 packets containing a Destination Option header with invalid option type values.

Information

These options are intended to be for the Hop-by-Hop 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. Hence, this 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.

Solution

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

user@R1# edit firewall family inet6
user@R1# edit filter IPV6-INGRESS-FILTER
user@R1# set term DEST_ OPT_HEADER from next-header dstops
user@R1# set term DEST_ OPT_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_Y25M01_STIG.zip

Item Details

Category: SYSTEM AND COMMUNICATIONS PROTECTION

References: 800-53|SC-7(11), CAT|II, CCI|CCI-002403, Rule-ID|SV-233296r855915_rule, STIG-ID|JUNI-RT-000384, Vuln-ID|V-233296

Plugin: Juniper

Control ID: 253932e73d119ac1dbdfccef3810de06fd3af3fd2baca4b3072fe53c14dcdc95