Title

The Ubuntu operating system audit event multiplexor must be configured to off-load audit logs onto a different system or storage media from the system being audited. (Cat III impact)

Discussion

Information stored in one location is vulnerable to accidental or incidental deletion or alteration. Off-loading is a common process in information systems with limited audit storage capacity.

Check Content

Verify the audit event multiplexor is configured to off-load audit records to a different system or storage media from the system being audited. Check that audisp-remote plugin is installed: # sudo dpkg -s audispd-plugins If status is "not installed", verify that another method to off-load audit logs has been implemented. Check that the records are being off-loaded to a remote server with the following command: # sudo grep -i active /etc/audisp/plugins.d/au-remote.conf active = yes If "active" is not set to "yes", or the line is commented out, ask the System Administrator to indicate how the audit logs are off-loaded to a different system or storage media. If there is no evidence that the system is configured to off-load audit logs to a different system or storage media, this is a finding.

Fix Text

Configure the audit event multiplexor to off-load audit records to a different system or storage media from the system being audited. Install the audisp-remote plugin: # sudo apt-get install audispd-plugins -y Set the audisp-remote plugin as active, by editing the /etc/audisp/plugins.d/au-remote.conf file: # sudo sed -i -E 's/active\s*=\s*no/active = yes/' /etc/audisp/plugins.d/au-remote.conf Set the address of the remote machine, by editing the /etc/audisp/audisp-remote.conf file: # sudo sed -i -E 's/(remote_server\s*=).*/\1 <remote addr>/' audisp-remote.conf where <remote addr> must be substituted by the address of the remote server receiving the audit log. Make the audit service reload its configuration files: # sudo systemctl restart auditd.service

Additional Identifiers

Rule ID: SV-219162r877390_rule

Vulnerability ID: V-219162

Group Title: SRG-OS-000342-GPOS-00133

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