The OL 8 operating system must implement DoD-approved encryption in the OpenSSL package.

Severity	Group ID	Group Title	Version	Rule ID	Date	STIG Version
medium	V-248564	SRG-OS-000250-GPOS-00093	OL08-00-010293	SV-248564r1069146_rule	2025-02-20	2

Description
Without cryptographic integrity protections, information can be altered by unauthorized users without detection. Remote access (e.g., RDP) is access to DOD nonpublic information systems by an authorized user (or an information system) communicating through an external, nonorganization-controlled network. Remote access methods include, for example, dial-up, broadband, and wireless. Cryptographic mechanisms used for protecting the integrity of information include, for example, signed hash functions using asymmetric cryptography, enabling distribution of the public key to verify the hash information while maintaining the confidentiality of the secret key used to generate the hash. OL 8 incorporates systemwide crypto policies by default. The employed algorithms can be viewed in the "/etc/crypto-policies/back-ends/openssl.config" file.

Description

Without cryptographic integrity protections, information can be altered by unauthorized users without detection. Remote access (e.g., RDP) is access to DOD nonpublic information systems by an authorized user (or an information system) communicating through an external, nonorganization-controlled network. Remote access methods include, for example, dial-up, broadband, and wireless. Cryptographic mechanisms used for protecting the integrity of information include, for example, signed hash functions using asymmetric cryptography, enabling distribution of the public key to verify the hash information while maintaining the confidentiality of the secret key used to generate the hash. OL 8 incorporates systemwide crypto policies by default. The employed algorithms can be viewed in the "/etc/crypto-policies/back-ends/openssl.config" file.

ℹ️ Check
Verify the OpenSSL library is configured to use only ciphers employing FIPS 140-2-approved algorithms: Verify that systemwide crypto policies are in effect: $ sudo grep -i opensslcnf.config /etc/pki/tls/openssl.cnf .include /etc/crypto-policies/back-ends/opensslcnf.config If the "opensslcnf.config" is not defined in the "/etc/pki/tls/openssl.cnf" file, this is a finding. Verify which systemwide crypto policy is in use: $ sudo fips-mode-setup --check FIPS mode is enabled. If the systemwide crypto policy is set to anything other than "FIPS", this is a finding.

ℹ️ Check

Verify the OpenSSL library is configured to use only ciphers employing FIPS 140-2-approved algorithms: Verify that systemwide crypto policies are in effect: $ sudo grep -i opensslcnf.config /etc/pki/tls/openssl.cnf .include /etc/crypto-policies/back-ends/opensslcnf.config If the "opensslcnf.config" is not defined in the "/etc/pki/tls/openssl.cnf" file, this is a finding. Verify which systemwide crypto policy is in use: $ sudo fips-mode-setup --check FIPS mode is enabled. If the systemwide crypto policy is set to anything other than "FIPS", this is a finding.

✔️ Fix
Configure the OL 8 OpenSSL library to use only ciphers employing FIPS 140-2 approved algorithms with the following command: $ sudo fips-mode-setup --enable A reboot is required for the changes to take effect.