Detections
Analytics
OL09-00-006030 - OL 9 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.
Solution
Configure OL 9 to not respond to IPv4 ICMP echoes sent to a broadcast address.Add or edit the following line in a single system configuration file in the "/etc/sysctl.d/" directory:
net.ipv4.icmp_echo_ignore_broadcasts = 1
Load 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_Oracle_Linux_9_V1R6_STIG.zip
Item Details
Audit Name: DISA Oracle Linux 9 STIG v1r6
Category: CONFIGURATION MANAGEMENT
References: 800-53|CM-6b., CAT|II, CCI|CCI-000366, Rule-ID|SV-271873r1092331_rule, STIG-ID|OL09-00-006030, Vuln-ID|V-271873
Plugin: Unix
Control ID: ae092e3c6c4d2531fc78df8d1dbf41e67337fb207a5f847695069c42b30b3441