Detections
Analytics

1.418 RHEL-10-800170

Information

RHEL 10 must not respond to Internet Control Message Protocol (ICMP) echoes sent to a broadcast address.

GROUP ID: V-281349RULE ID: SV-281349r1167197

Responding to broadcast (ICMP) echoes facilitates network mapping and provides a vector for amplification attacks.

Ignoring ICMP echo requests (pings) sent to broadcast or multicast addresses makes the system slightly more difficult to enumerate on the network.

Satisfies: SRG-OS-000420-GPOS-00186, SRG-OS-000142-GPOS-00080

Solution

Configure RHEL 10 to ignore Internet Protocol version 4 (IPv4) ICMP echoes sent to a broadcast address.

Create a configuration file if it does not already exist:

$ sudo vi /etc/sysctl.d/ipv4_icmp_echo_ignore_broadcasts.conf

Add the following line to the file:

net.ipv4.icmp_echo_ignore_broadcasts = 1

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-001104, CCI|CCI-002385, Rule-ID|SV-281349r1167197_rule, STIG-ID|RHEL-10-800170, Vuln-ID|V-281349

Plugin: Unix

Control ID: cb7aeb507ecd675bdcecc2bd03838646b62afb93eeabbf6255bf31556cfa7718