STIGQter: STIG Summary: Canonical Ubuntu 18.04 LTS Security Technical Implementation Guide Version: 2 Release: 3 Benchmark Date: 23 Apr 2021:

Ubuntu operating systems handling data requiring data at rest protections must employ cryptographic mechanisms to prevent unauthorized disclosure and modification of the information at rest.

DISA Rule

SV-219150r610963_rule

Vulnerability Number

V-219150

Group Title

SRG-OS-000185-GPOS-00079

Rule Version

UBTU-18-010003

Severity

CAT II

CCI(s)

• CCI-002475 - The information system implements cryptographic mechanisms to prevent unauthorized modification of organization-defined information at rest on organization-defined information system components.
• CCI-002476 - The information system implements cryptographic mechanisms to prevent unauthorized disclosure of organization-defined information at rest on organization-defined information system components.
• CCI-001199 - The information system protects the confidentiality and/or integrity of organization-defined information at rest.

Weight

10

Fix Recommendation

To encrypt an entire partition, dedicate a partition for encryption in the partition layout.

Note: Encrypting a partition in an already-installed system is more difficult because the existing partitions must be resized and changed.

Check Contents

If there is a documented and approved reason for not having data-at-rest encryption, this requirement is Not Applicable.

Verify the Ubuntu operating system prevents unauthorized disclosure or modification of all information requiring at rest protection by using disk encryption.

Determine the partition layout for the system with the following command:

#sudo fdisk -l
(..)
Disk /dev/vda: 15 GiB, 16106127360 bytes, 31457280 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: gpt
Disk identifier: 83298450-B4E3-4B19-A9E4-7DF147A5FEFB

Device Start End Sectors Size Type
/dev/vda1 2048 4095 2048 1M BIOS boot
/dev/vda2 4096 2101247 2097152 1G Linux filesystem
/dev/vda3 2101248 31455231 29353984 14G Linux filesystem
(...)

Verify that the system partitions are all encrypted with the following command:

# more /etc/crypttab

Every persistent disk partition present must have an entry in the file. If any partitions other than the boot partition or pseudo file systems (such as /proc or /sys) are not listed, this is a finding.

Vulnerability Number

V-219150

Documentable

False

Rule Version

UBTU-18-010003

Severity Override Guidance

If there is a documented and approved reason for not having data-at-rest encryption, this requirement is Not Applicable.

Verify the Ubuntu operating system prevents unauthorized disclosure or modification of all information requiring at rest protection by using disk encryption.

Determine the partition layout for the system with the following command:

#sudo fdisk -l
(..)
Disk /dev/vda: 15 GiB, 16106127360 bytes, 31457280 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: gpt
Disk identifier: 83298450-B4E3-4B19-A9E4-7DF147A5FEFB

Device Start End Sectors Size Type
/dev/vda1 2048 4095 2048 1M BIOS boot
/dev/vda2 4096 2101247 2097152 1G Linux filesystem
/dev/vda3 2101248 31455231 29353984 14G Linux filesystem
(...)

Verify that the system partitions are all encrypted with the following command:

# more /etc/crypttab

Every persistent disk partition present must have an entry in the file. If any partitions other than the boot partition or pseudo file systems (such as /proc or /sys) are not listed, this is a finding.

Check Content Reference

M

Target Key

4055

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