Details

L2TPv3 sessions can be used to transport layer-2 protocols across an IP backbone. These protocols were intended for link-local scope only and are therefore less defended and not as well-known. As stated in DoD IPv6 IA Guidance for MO3 (S4-C7-1), the L2TP tunnels can also carry IP packets that are very difficult to filter because of the additional encapsulation. Hence, it is imperative that L2TP sessions are authenticated prior to transporting traffic.

NOTE: Currently JUNOS does not support L2TPv3 so this vulnerability is not applicable.

Solution

Configure L2TPv3 to use authentication for any peering sessions.

Supportive Information

The following resource is also helpful.

• https://iasecontent.disa.mil/stigs/zip/U_Network_Infrastructure_Router_L3_Switch_V8R29_STIG.zip

This security hardening control applies to the following category of controls within NIST 800-53: Identification and Authentication.This control applies to the following type of system Juniper.

References

• 800-53|IA-3
• CAT|II
• Rule-ID|SV-40557r1_rule
• STIG-ID|NET-TUNL-034
• Vuln-ID|V-30744

Source

• Tenable.com/audits