Title

The Juniper router must be configured to have Internet Control Message Protocol (ICMP) redirect messages disabled on all external interfaces. (Cat II impact)

Discussion

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.

Check Content

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 Text

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

Additional Identifiers

Rule ID: SV-217024r604135_rule

Vulnerability ID: V-217024

Group Title: SRG-NET-000362-RTR-000115

Expert Comments

CCIs tied to check.

Controls tied to check. These are derived from the CCIs shown above.