JUEX-RT-000520 - The Juniper PE router must be configured to ignore or block all packets with any IP options.

Information

Packets with IP options are not fast switched and, therefore, must be punted to the route engine (RE). 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.

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

Solution

Configure the router to drop all packets with IP options.

set firewall family inet filter <filter name> term 1 from ip-options any
set firewall family inet filter <filter name> term 1 then log
set firewall family inet filter <filter name> term 1 then syslog
set firewall family inet filter <filter name> term 1 then discard
<additional accept terms>
set firewall family inet filter default term 1 then log
set firewall family inet filter default term 1 then syslog
set firewall family inet filter default term 1 then discard

set interfaces <interface name> unit <number> family inet filter input <filter name>
set interfaces <interface name> unit <number> family inet address <IPv4 address>/<mask>

See Also

https://dl.dod.cyber.mil/wp-content/uploads/stigs/zip/U_Juniper_EX_Switches_Y24M07_STIG.zip

Item Details

Category: SYSTEM AND COMMUNICATIONS PROTECTION

References: 800-53|SC-7(11), CAT|II, CCI|CCI-002403, CCI|CCI-004866, Rule-ID|SV-254024r997532_rule, STIG-ID|JUEX-RT-000520, Vuln-ID|V-254024

Plugin: Juniper

Control ID: 6bda87dbd6b1f708e8e19e32fcf771da516e265be629e34b8d42bfc215fbee0f