STIGQter: STIG Summary: Tri-Lab Operating System Stack (TOSS) 4 Security Technical Implementation Guide Version: 2 Release: 6 Benchmark Date: 01 Jul 2026:

All TOSS local disk partitions must implement cryptographic mechanisms to prevent unauthorized disclosure or modification of all information that requires at-rest protection.

DISA Rule

SV-253085r1207691_rule

Vulnerability Number

V-253085

Group Title

SRG-OS-000185-GPOS-00079

Rule Version

TOSS-04-040330

Severity

CAT I

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.

Weight

10

Fix Recommendation

Configure TOSS to prevent unauthorized modification of all information at rest by using disk encryption.

Encrypting a partition in an already installed system is more difficult, because existing partitions will need to be resized and changed. To encrypt an entire partition, dedicate a partition for encryption in the partition layout.

Check Contents

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

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

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

$ sudo blkid

/dev/mapper/rhel-root: UUID="67b7d7fe-de60-6fd0-befb-e6748cf97743" TYPE="crypto_LUKS"

Every persistent disk partition present must be of TYPE "crypto_LUKS." If any partitions other than pseudo file systems (such as /proc or /sys) are not type "crypto_LUKS", ask the administrator to indicate how the partitions are encrypted. If there is no evidence that all local disk partitions are encrypted, this is a finding.

Vulnerability Number

V-253085

Documentable

False

Rule Version

TOSS-04-040330

Severity Override Guidance

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

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

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

$ sudo blkid

/dev/mapper/rhel-root: UUID="67b7d7fe-de60-6fd0-befb-e6748cf97743" TYPE="crypto_LUKS"

Every persistent disk partition present must be of TYPE "crypto_LUKS." If any partitions other than pseudo file systems (such as /proc or /sys) are not type "crypto_LUKS", ask the administrator to indicate how the partitions are encrypted. If there is no evidence that all local disk partitions are encrypted, this is a finding.

Check Content Reference

M

Target Key

5469