Detections
Analytics
SLEM-05-213010 - SLEM 5 must restrict access to the kernel message buffer.
Information
Restricting access to the kernel message buffer limits access only to root. This prevents attackers from gaining additional system information as a nonprivileged user.Solution
Configure SLEM 5 to restrict access to the kernel message buffer.Set the system to the required kernel parameter by adding or modifying the following line in /etc/sysctl.conf or a config file in the /etc/sysctl.d/ directory:
kernel.dmesg_restrict = 1
Remove any configurations that conflict with the above from the following locations:
/run/sysctl.d/
/etc/sysctl.d/
/usr/local/lib/sysctl.d/
/usr/lib/sysctl.d/
/lib/sysctl.d/
/etc/sysctl.conf
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_SLEM_5_V1R4_STIG.zip
Item Details
Category: SYSTEM AND COMMUNICATIONS PROTECTION
References: 800-53|SC-4, CAT|II, CCI|CCI-001090, Rule-ID|SV-261269r1137695_rule, STIG-ID|SLEM-05-213010, Vuln-ID|V-261269
Plugin: Unix
Control ID: eae2518d21428d75584d9c2708e80868f7bc670f3da4c7b0ed76efa37ca35df5