Cis Ubuntu1604 V200 4 2 1 3

CIS Ubuntu Linux 16.04 LTS Benchmark v2.0.0 - Control 4.2.1.3

Profile

• Level: 1 - Server
• Level: 1 - Workstation
• Assessment Status: Manual

Description

The /etc/rsyslog.conf and /etc/rsyslog.d/*.conf files specifies rules for logging and which files are to be used to log certain classes of messages.

Rationale

A great deal of important security-related information is sent via rsyslog (e.g., successful and failed su attempts, failed login attempts, root login attempts, etc.).

Impact

None.

Audit Procedure

Review the contents of the /etc/rsyslog.conf and /etc/rsyslog.d/*.conf files to ensure appropriate logging is set. In addition, run the following command and verify that the log files are logging information:

Command Line

ls -l /var/log/

Expected Result

The output should show log files with recent timestamps and non-zero sizes, indicating active logging.

Remediation

Edit the following lines in the /etc/rsyslog.conf and /etc/rsyslog.d/*.conf files as appropriate for your environment:

Command Line

cat << 'EOF'
*.emerg                          :omusrmsg:*
auth,authpriv.*                  /var/log/auth.log
mail.*                           -/var/log/mail
mail.info                        -/var/log/mail.info
mail.warning                     -/var/log/mail.warn
mail.err                          /var/log/mail.err
news.crit                        -/var/log/news/news.crit
news.err                         -/var/log/news/news.err
news.notice                      -/var/log/news/news.notice
*.=warning;*.=err                -/var/log/warn
*.crit                            /var/log/warn
*.*;mail.none;news.none          -/var/log/messages
local0,local1.*                  -/var/log/localmessages
local2,local3.*                  -/var/log/localmessages
local4,local5.*                  -/var/log/localmessages
local6,local7.*                  -/var/log/localmessages
EOF

Run the following command to reload the rsyslog configuration:

systemctl reload rsyslog

Default Value

Not all of the above logging rules are configured by default.

References

1. See the rsyslog.conf(5) man page for more information.

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