Audit logs must have a mode of 0600 or less permissive to prevent unauthorized read access.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-75635	UBTU-16-020090	SV-90315r3_rule		Medium

Description
Unauthorized disclosure of audit records can reveal system and configuration data to attackers, thus compromising its confidentiality. Audit information includes all information (e.g., audit records, audit settings, audit reports) needed to successfully audit Ubuntu operating system activity. Satisfies: SRG-OS-000057-GPOS-00027, SRG-OS-000058-GPOS-00028, SRG-OS-000059-GPOS-00029, SRG-OS-000206-GPOS-00084

Description

Unauthorized disclosure of audit records can reveal system and configuration data to attackers, thus compromising its confidentiality. Audit information includes all information (e.g., audit records, audit settings, audit reports) needed to successfully audit Ubuntu operating system activity. Satisfies: SRG-OS-000057-GPOS-00027, SRG-OS-000058-GPOS-00028, SRG-OS-000059-GPOS-00029, SRG-OS-000206-GPOS-00084

STIG	Date
Canonical Ubuntu 16.04 Security Technical Implementation Guide	2020-05-29

Details

Check Text ( C-75339r2_chk )
Verify the audit logs have a mode of "0600" or less permissive. First determine where the audit logs are stored with the following command: # sudo grep -iw log_file /etc/audit/auditd.conf log_file = /var/log/audit/audit.log Using the location of the audit log file, check if the audit log has a mode of "0600" or less permissive with the following command: # sudo stat -c "%a %n" /var/log/audit/audit.log 600 /var/log/audit/audit.log If the audit log has a mode more permissive than "0600", this is a finding.

Check Text ( C-75339r2_chk )

Verify the audit logs have a mode of "0600" or less permissive.

First determine where the audit logs are stored with the following command:

# sudo grep -iw log_file /etc/audit/auditd.conf

log_file = /var/log/audit/audit.log

Using the location of the audit log file, check if the audit log has a mode of "0600" or less permissive with the following command:

# sudo stat -c "%a %n" /var/log/audit/audit.log

600 /var/log/audit/audit.log

If the audit log has a mode more permissive than "0600", this is a finding.

Fix Text (F-82263r1_fix)
Configure the audit log to be protected from unauthorized read access by setting the correct permissive mode with the following command: # sudo chmod 0600 [audit_log_file] Replace "[audit_log_file]" to the correct audit log path, by default this location is "/var/log/audit/audit.log".