Detections
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1.421 RHEL-10-800200

Information

RHEL 10 must not allow interfaces to perform Internet Control Message Protocol (ICMP) redirects by default.

GROUP ID: V-281352RULE ID: SV-281352r1184706

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-00083

Solution

Configure RHEL 10 to not allow interfaces to perform IPv4 ICMP redirects by default.

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.default.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-001107, CCI|CCI-002385, Rule-ID|SV-281352r1184706_rule, STIG-ID|RHEL-10-800200, Vuln-ID|V-281352

Plugin: Unix

Control ID: dcbfe5c514d5fb2fc33b826de9a77ea875180cb826c93b5876bd9629434ef58d