STIGQter: STIG Summary: Riverbed NetIM OS Security Technical Implementation Guide Version: 1 Release: 1 Benchmark Date: 11 Sep 2025:

Ubuntu OS must implement cryptographic mechanisms to prevent unauthorized disclosure and modification of all information that requires protection at rest.

DISA Rule

SV-275578r1147784_rule

Vulnerability Number

V-275578

Group Title

SRG-OS-000185-GPOS-00079

Rule Version

RIIM-OS-231010

Severity

CAT II

CCI(s)

• CCI-001199 - Protects the confidentiality and/or integrity of organization-defined information at rest.
• CCI-002475 - Implement cryptographic mechanisms to prevent unauthorized modification of organization-defined information when at rest on organization-defined system components.
• CCI-002476 - Implement cryptographic mechanisms to prevent unauthorized disclosure of organization-defined information at rest on organization-defined system components.
• CCI-004910 - Provide protected storage for cryptographic keys with organization-defined safeguards and/or hardware protected key store.

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 it will need to be resized, and existing partitions changed.

Check Contents

Verify Ubuntu OS prevents unauthorized disclosure or modification of all information requiring at-rest protection by using disk encryption.

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

Determine the partition layout for the system by using the following command:

$ sudo fdisk -l

...
Device Start End Sectors Size Type
/dev/sda1 2048 2203647 2201600 1G EFI System
/dev/sda2 2203648 6397951 4194304 2G Linux filesystem
/dev/sda3 6397952 536868863 530470912 252.9G Linux filesystem
...

Verify the system partitions are all encrypted by using 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-275578

Documentable

False

Rule Version

RIIM-OS-231010

Severity Override Guidance

Verify Ubuntu OS prevents unauthorized disclosure or modification of all information requiring at-rest protection by using disk encryption.

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

Determine the partition layout for the system by using the following command:

$ sudo fdisk -l

...
Device Start End Sectors Size Type
/dev/sda1 2048 2203647 2201600 1G EFI System
/dev/sda2 2203648 6397951 4194304 2G Linux filesystem
/dev/sda3 6397952 536868863 530470912 252.9G Linux filesystem
...

Verify the system partitions are all encrypted by using 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

5706