Ubuntu OS must implement NIST FIPS-validated cryptography.

Severity	Group ID	Group Title	Version	Rule ID	Date	STIG Version
high	V-275735	SRG-OS-000396-GPOS-00176	RIIM-OS-671010	SV-275735r1148255_rule	2025-10-02	1

Description
Use of weak or untested encryption algorithms undermines the purposes of utilizing encryption to protect data. The operating system must implement cryptographic modules adhering to the higher standards approved by the federal government since this provides assurance they have been tested and validated. Satisfies: SRG-OS-000396-GPOS-00176, SRG-OS-000478-GPOS-00223, SRG-OS-000112-GPOS-00057, SRG-OS-000113-GPOS-00058

Description

Use of weak or untested encryption algorithms undermines the purposes of utilizing encryption to protect data. The operating system must implement cryptographic modules adhering to the higher standards approved by the federal government since this provides assurance they have been tested and validated. Satisfies: SRG-OS-000396-GPOS-00176, SRG-OS-000478-GPOS-00223, SRG-OS-000112-GPOS-00057, SRG-OS-000113-GPOS-00058

ℹ️ Check
Verify the system is configured to run in FIPS mode by using the following command: $ grep -i 1 /proc/sys/crypto/fips_enabled 1 If a value of "1" is not returned, this is a finding.

✔️ Fix
Configure Ubuntu OS to run in FIPS mode. Add "fips=1" to the kernel parameter during Ubuntu OS install. Enabling a FIPS mode on a pre-existing system involves a number of modifications to Ubuntu OS. Refer to the Ubuntu Pro security certification documentation for instructions. A subscription to the Ubuntu Pro plan is required to obtain the FIPS Kernel cryptographic modules and enable FIPS. Note: Ubuntu Pro security certification instructions can be found at: https://ubuntu.com/security/certifications/docs/fips-enablement.

✔️ Fix

Configure Ubuntu OS to run in FIPS mode. Add "fips=1" to the kernel parameter during Ubuntu OS install. Enabling a FIPS mode on a pre-existing system involves a number of modifications to Ubuntu OS. Refer to the Ubuntu Pro security certification documentation for instructions. A subscription to the Ubuntu Pro plan is required to obtain the FIPS Kernel cryptographic modules and enable FIPS. Note: Ubuntu Pro security certification instructions can be found at: https://ubuntu.com/security/certifications/docs/fips-enablement.