The Juniper router must be configured to have Internet Control Message Protocol (ICMP) redirect messages disabled on all external interfaces.
Severity | Group ID | Group Title | Version | Rule ID | Date | STIG Version |
|---|---|---|---|---|---|---|
| medium | V-217024 | SRG-NET-000362-RTR-000115 | JUNI-RT-000190 | SV-217024r855892_rule | 2024-12-05 | 3 |
| Description |
|---|
| The ICMP supports IP traffic by relaying information about paths, routes, and network conditions. Routers automatically send ICMP messages under a wide variety of conditions. Redirect ICMP messages are commonly used by attackers for network mapping and diagnosis. |
| ℹ️ Check |
|---|
| Review the device configuration to determine if it has been configured to ensure the router does not send ICMP Redirect messages out to any external interface. interfaces { ge-1/0/0 { unit 0 { family inet { no-redirects; address 11.1.12.2/24; } } } ge-1/1/0 { unit 0 { family inet { no-redirects; address 11.1.23.2/24; } } } If ICMP Redirect messages are enabled on any external interfaces, this is a finding. |
| ✔️ Fix |
|---|
| Disable ICMP redirects on all external interfaces as shown in the example below. [edit interfaces] set ge-1/0/0 unit 0 family inet no-redirects set ge-1/1/0 unit 0 family inet no-redirects |