Detections
Analytics
RHEL-10-800170 - RHEL 10 must not respond to Internet Control Message Protocol (ICMP) echoes sent to a broadcast address.
Information
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://dl.dod.cyber.mil/wp-content/uploads/stigs/zip/U_RHEL_10_V1R1_STIG.zip
Item Details
Audit Name: DISA Red Hat Enterprise Linux 10 STIG v1r1
Category: SYSTEM AND COMMUNICATIONS PROTECTION
References: 800-53|SC-5, 800-53|SC-7(4)(c), 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: d82ad1871cfbcf8bf71b6d0145b341d8aa1979efde1c5a899a8ce8bdb840fead