System Audit Logs Must Have Mode 0750 or Less Permissive
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If log_group in /etc/audit/auditd.conf is set to a group other than the root
group account, change the mode of the audit log files with the following command:
$ sudo chmod 0750 /var/log/audit
Otherwise, change the mode of the audit log files with the following command:
$ sudo chmod 0700 /var/log/audit
If users can write to audit logs, audit trails can be modified or destroyed.
The following script can be run on the host to remediate the issue.
#!/bin/bash
# Remediation is applicable only in certain platforms
if dpkg-query --show --showformat='${db:Status-Status}
' 'kernel' 2>/dev/null | grep -q installed && dpkg-query --show --showformat='${db:Status-Status}\n' 'auditd' 2>/dev/null | grep -q installed; then
if LC_ALL=C grep -iw ^log_file /etc/audit/auditd.conf; then
DIR=$(awk -F "=" '/^log_file/ {print $2}' /etc/audit/auditd.conf | tr -d ' ' | rev | cut -d"/" -f2- | rev)
else
DIR="/var/log/audit"
fi
if LC_ALL=C grep -m 1 -q ^log_group /etc/audit/auditd.conf; then
GROUP=$(awk -F "=" '/log_group/ {print $2}' /etc/audit/auditd.conf | tr -d ' ')
if ! [ "${GROUP}" == 'root' ] ; then
chmod 0750 $DIR
else
chmod 0700 $DIR
fi
else
chmod 0700 $DIR
fi
else
>&2 echo 'Remediation is not applicable, nothing was done'
fi
