All uses of the umount command must be audited.

From Red Hat Enterprise Linux 7 Security Technical Implementation Guide

SV-86797r4_rule All uses of the umount command must be audited.

Vulnerability discussion

Reconstruction of harmful events or forensic analysis is not possible if audit records do not contain enough information.At a minimum, the organization must audit the full-text recording of privileged mount commands. The organization must maintain audit trails in sufficient detail to reconstruct events to determine the cause and impact of compromise.Satisfies: SRG-OS-000042-GPOS-00020, SRG-OS-000392-GPOS-00172

Check content

Verify the operating system generates audit records when successful/unsuccessful attempts to use the "umount" command occur. Check for the following system calls being audited by performing the following series of commands to check the file system rules in "/etc/audit/audit.rules": # grep -i "/bin/umount" /etc/audit/audit.rules -a always,exit -F path=/bin/umount -F perm=x -F auid>=1000 -F auid!=4294967295 -k privileged-mount If the command does not return any output, this is a finding.

Fix text

Configure the operating system to generate audit records when successful/unsuccessful attempts to use the "umount" command occur. Add or update the following rule in "/etc/audit/rules.d/audit.rules": -a always,exit -F path=/bin/umount -F perm=x -F auid>=1000 -F auid!=4294967295 -k privileged-mount The audit daemon must be restarted for the changes to take effect.

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