The /var/log/syslog file must have mode 0640 or less permissive.

From Canonical Ubuntu 16.04 LTS Security Technical Implementation Guide

Associated with: CCI-001314

SV-90283r3_rule The /var/log/syslog file must have mode 0640 or less permissive.

Vulnerability discussion

Only authorized personnel should be aware of errors and the details of the errors. Error messages are an indicator of an organization's operational state or can identify the Ubuntu operating system or platform. Additionally, Personally Identifiable Information (PII) and operational information must not be revealed through error messages to unauthorized personnel or their designated representatives.The structure and content of error messages must be carefully considered by the organization and development team. The extent to which the information system is able to identify and handle error conditions is guided by organizational policy and operational requirements.

Check content

Verify that the "/var/log/syslog" file has mode "0640" or less permissive. Check that "/var/log/syslog" has mode "0640" or less permissive with the following command: # stat -c "%a %n" /var/log/syslog 640 /var/log/syslog If a value of "640" or less permissive is not returned, this is a finding.

Fix text

Change the permissions of the file "/var/log/syslog" to "0640" by running the following command: # sudo chmod 0640 /var/log

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