Vulnerability Discussion

The system logs must be configured to be writable by root and readable
only by the root user and group wheel. To achieve this, system log files must be configured to mode 640
permissive or less; thereby preventing normal users from reading, modifying, or deleting audit logs.
System logs frequently contain sensitive information that could be used by an attacker. Setting the
correct permissions mitigates this risk.

Satisfies: SRG-OS-000205-GPOS-00083,SRG-OS-000206-GPOS-00084

Check

Verify the macOS system is configured with system log files set to mode 640 or less
permissive with the following command:

/usr/bin/stat -f '%A:%N' $(/usr/bin/grep -v '^#' /etc/newsyslog.conf | /usr/bin/awk '{ print $1 }')
2> /dev/null | /usr/bin/awk '!/640/{print $1}' | /usr/bin/wc -l | /usr/bin/tr -d ' '

If the result is not "0", this is a finding.

Fix

Configure the macOS system with system log files set to mode 640 or
less permissive with the following command:

/bin/chmod 640 $(/usr/bin/stat -f '%A:%N' $(/usr/bin/grep -v '^#' /etc/newsyslog.conf | /usr/bin/awk '{
print $1 }') 2> /dev/null | /usr/bin/awk '!/640/{print $1}' | awk -F":" '!/640/{print $2}')