Audit logs must be group-owned by root to prevent unauthorized read access.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-75641	UBTU-16-020120	SV-90321r2_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 LTS Security Technical Implementation Guide	2018-07-18

Details

Check Text ( C-75345r2_chk )
Verify the audit logs are group-owned by "root". 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, determine if the audit log is group-owned by "root" using the following command: # sudo ls -la /var/log/audit/audit.log rw------- 2 root root 8096 Jun 26 11:56 /var/log/audit/audit.log If the audit log is not group-owned by "root", this is a finding.

Check Text ( C-75345r2_chk )

Verify the audit logs are group-owned by "root". 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, determine if the audit log is group-owned by "root" using the following command:

# sudo ls -la /var/log/audit/audit.log
rw------- 2 root root 8096 Jun 26 11:56 /var/log/audit/audit.log

If the audit log is not group-owned by "root", this is a finding.

Fix Text (F-82269r2_fix)
Configure the audit log to be protected from unauthorized read access, by setting the correct group-owner as "root" with the following command: # sudo chgrp root [audit_log_file] Replace "[audit_log_file]" to the correct audit log path, by default this location is "/var/log/audit/audit.log".