ARST-RT-000600 - The Arista BGP router must be configured to enable the Generalized TTL Security Mechanism (GTSM).

Information

GTSM is designed to protect a router's IP-based control plane from DoS attacks. Many attacks focused on CPU load and line-card overload can be prevented by implementing GTSM on all Exterior Border Gateway Protocol speaking routers.

GTSM is based on the fact that the vast majority of control plane peering is established between adjacent routers; that is, the Exterior Border Gateway Protocol peers are either between connecting interfaces or between loopback interfaces. Since TTL spoofing is considered nearly impossible, a mechanism based on an expected TTL value provides a simple and reasonably robust defense from infrastructure attacks based on forged control plane traffic.

Solution

Configure all Exterior Border Gateway Protocol peering sessions to use GTSM.

router bgp 65000
neighbor 10.1.12.2 ttl maximum-hops 2

See Also

https://dl.dod.cyber.mil/wp-content/uploads/stigs/zip/U_Arista_MLS_EOS_4-2x_Y24M07_STIG.zip

Item Details

Category: SYSTEM AND COMMUNICATIONS PROTECTION

References: 800-53|SC-5, CAT|III, CCI|CCI-002385, Rule-ID|SV-256039r882459_rule, STIG-ID|ARST-RT-000600, Vuln-ID|V-256039

Plugin: Arista

Control ID: 553c8b2a680af09f7038dcbbc0f855d070e023eb47d65794480e0a8303c6d5f8