STIGQter: STIG Summary: Canonical Ubuntu 20.04 LTS Security Technical Implementation Guide Version: 1 Release: 1 Benchmark Date: 10 Mar 2021:

The Ubuntu operating system must allocate audit record storage capacity to store at least one weeks' worth of audit records, when audit records are not immediately sent to a central audit record storage facility.

DISA Rule

SV-238305r654090_rule

Vulnerability Number

V-238305

Group Title

SRG-OS-000341-GPOS-00132

Rule Version

UBTU-20-010215

Severity

CAT III

CCI(s)

• CCI-001849 - The organization allocates audit record storage capacity in accordance with organization-defined audit record storage requirements.

Weight

10

Fix Recommendation

Allocate enough storage capacity for at least one week's worth of audit records when audit records are not immediately sent to a central audit record storage facility.

If audit records are stored on a partition made specifically for audit records, use the "parted" program to resize the partition with sufficient space to contain one week's worth of audit records.

If audit records are not stored on a partition made specifically for audit records, a new partition with sufficient amount of space will need be to be created.

Set the auditd server to point to the mount point where the audit records must be located:

$ sudo sed -i -E 's@^(log_file\s*=\s*).*@\1 <log mountpoint>/audit.log@' /etc/audit/auditd.conf

where <log mountpoint> is the aforementioned mount point.

Check Contents

Verify the Ubuntu operating system allocates audit record storage capacity to store at least one week's worth of audit records when audit records are not immediately sent to a central audit record storage facility.

Determine which partition the audit records are being written to with the following command:

$ sudo grep ^log_file /etc/audit/auditd.conf
log_file = /var/log/audit/audit.log

Check the size of the partition that audit records are written to (with the example being "/var/log/audit/") with the following command:

$ sudo df –h /var/log/audit/
/dev/sda2 24G 10.4G 13.6G 43% /var/log/audit

If the audit records are not written to a partition made specifically for audit records ("/var/log/audit" is a separate partition), determine the amount of space being used by other files in the partition with the following command:

$ sudo du –sh [audit_partition]
1.8G /var/log/audit

Note: The partition size needed to capture a week's worth of audit records is based on the activity level of the system and the total storage capacity available. In normal circumstances, 10.0 GB of storage space for audit records will be sufficient.

If the audit record partition is not allocated for sufficient storage capacity, this is a finding.

Vulnerability Number

V-238305

Documentable

False

Rule Version

UBTU-20-010215

Severity Override Guidance

Verify the Ubuntu operating system allocates audit record storage capacity to store at least one week's worth of audit records when audit records are not immediately sent to a central audit record storage facility.

Determine which partition the audit records are being written to with the following command:

$ sudo grep ^log_file /etc/audit/auditd.conf
log_file = /var/log/audit/audit.log

Check the size of the partition that audit records are written to (with the example being "/var/log/audit/") with the following command:

$ sudo df –h /var/log/audit/
/dev/sda2 24G 10.4G 13.6G 43% /var/log/audit

If the audit records are not written to a partition made specifically for audit records ("/var/log/audit" is a separate partition), determine the amount of space being used by other files in the partition with the following command:

$ sudo du –sh [audit_partition]
1.8G /var/log/audit

Note: The partition size needed to capture a week's worth of audit records is based on the activity level of the system and the total storage capacity available. In normal circumstances, 10.0 GB of storage space for audit records will be sufficient.

If the audit record partition is not allocated for sufficient storage capacity, this is a finding.

Check Content Reference

M

Target Key

5318

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