RHEL 9 must prevent system daemons from using Kerberos for authentication.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-258130	RHEL-09-611205	SV-258130r971535_rule		Medium

Description
Unapproved mechanisms used for authentication to the cryptographic module are not verified; therefore, cannot be relied upon to provide confidentiality or integrity and DOD data may be compromised. RHEL 9 systems utilizing encryption are required to use FIPS-compliant mechanisms for authenticating to cryptographic modules. The key derivation function (KDF) in Kerberos is not FIPS compatible. Ensuring the system does not have any keytab files present prevents system daemons from using Kerberos for authentication. A keytab is a file containing pairs of Kerberos principals and encrypted keys. FIPS 140-3 is the current standard for validating that mechanisms used to access cryptographic modules utilize authentication that meets DOD requirements. This allows for Security Levels 1, 2, 3, or 4 for use on a general-purpose computing system.

Description

Unapproved mechanisms used for authentication to the cryptographic module are not verified; therefore, cannot be relied upon to provide confidentiality or integrity and DOD data may be compromised. RHEL 9 systems utilizing encryption are required to use FIPS-compliant mechanisms for authenticating to cryptographic modules. The key derivation function (KDF) in Kerberos is not FIPS compatible. Ensuring the system does not have any keytab files present prevents system daemons from using Kerberos for authentication. A keytab is a file containing pairs of Kerberos principals and encrypted keys. FIPS 140-3 is the current standard for validating that mechanisms used to access cryptographic modules utilize authentication that meets DOD requirements. This allows for Security Levels 1, 2, 3, or 4 for use on a general-purpose computing system.

STIG	Date
Red Hat Enterprise Linux 9 Security Technical Implementation Guide	2024-06-04

Details

Check Text ( C-61871r926375_chk )
Verify that RHEL 9 prevents system daemons from using Kerberos for authentication with the following command: $ sudo ls -al /etc/.keytab ls: cannot access '/etc/.keytab': No such file or directory If this command produces any "keytab" file(s), this is a finding.

Fix Text (F-61795r926376_fix)
Configure RHEL 9 to prevent system daemons from using Kerberos for authentication. Remove any files with the .keytab extension from the operating system. rm -f /etc/*.keytab