SLEM 5 must restrict access to the kernel message buffer.

An XCCDF Rule

Description

<VulnDiscussion>Restricting access to the kernel message buffer limits access only to root. This prevents attackers from gaining additional system information as a nonprivileged user.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls>

ID: SV-261269r996301_rule
Severity: Medium
References: CCI-001090
Updated: 17 days ago

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

SLEM 5 must restrict access to the kernel message buffer.

Description

Remediation - Manual Procedure