Finding ID | Version | Rule ID | IA Controls | Severity |
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V-221877 | OL07-00-040630 | SV-221877r880648_rule | Medium |
Description |
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Responding to broadcast (ICMP) echoes facilitates network mapping and provides a vector for amplification attacks. |
STIG | Date |
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Oracle Linux 7 Security Technical Implementation Guide | 2023-12-01 |
Check Text ( C-23592r880646_chk ) |
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Verify the system does not respond to IPv4 ICMP echoes sent to a broadcast address. # grep -r net.ipv4.icmp_echo_ignore_broadcasts /run/sysctl.d/* /etc/sysctl.d/* /usr/local/lib/sysctl.d/* /usr/lib/sysctl.d/* /lib/sysctl.d/* /etc/sysctl.conf 2> /dev/null If "net.ipv4.icmp_echo_ignore_broadcasts" is not configured in the /etc/sysctl.conf file or in any of the other sysctl.d directories, is commented out, or does not have a value of "1", this is a finding. Check that the operating system implements the "icmp_echo_ignore_broadcasts" variable with the following command: # /sbin/sysctl -a | grep net.ipv4.icmp_echo_ignore_broadcasts net.ipv4.icmp_echo_ignore_broadcasts = 1 If the returned line does not have a value of "1", this is a finding. If conflicting results are returned, this is a finding. |
Fix Text (F-23581r880647_fix) |
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Set the system to the required kernel parameter by adding the following line to "/etc/sysctl.conf" or a configuration file in the /etc/sysctl.d/ directory (or modify the line to have the required value): net.ipv4.icmp_echo_ignore_broadcasts = 1 Issue the following command to make the changes take effect: # sysctl --system |