Detections
Analytics

1.420 RHEL-10-800190

Information

RHEL 10 must not send Internet Control Message Protocol (ICMP) redirects.

GROUP ID: V-281351RULE ID: SV-281351r1184698

ICMP redirect messages are used by routers to inform hosts that a more direct route exists for a particular destination. These messages contain information from the system's route table, possibly revealing portions of the network topology.

The ability to send ICMP redirects is only appropriate for systems acting as routers.

Satisfies: SRG-OS-000420-GPOS-00186, SRG-OS-000142-GPOS-00082

Solution

Configure RHEL 10 to not send IPv4 ICMP redirect messages.

Create a configuration file if it does not already exist:

$ sudo vi /etc/sysctl.d/ipv4_send_redirects.conf

Add the following line to the file:

net.ipv4.conf.all.send_redirects = 0

Reload settings from all system configuration files with the following command:

$ sudo sysctl --system

See Also

https://workbench.cisecurity.org/benchmarks/26403

Item Details

Category: SYSTEM AND COMMUNICATIONS PROTECTION

References: 800-53|SC-5, 800-53|SC-7(4), CAT|II, CCI|CCI-001106, CCI|CCI-002385, Rule-ID|SV-281351r1184698_rule, STIG-ID|RHEL-10-800190, Vuln-ID|V-281351

Plugin: Unix

Control ID: 3fefc4a931298ed5cc8e24d80a44d9a8d830b7abc7bfe87e173d0c197a24e031