The HYCU virtual appliance must prevent the installation of patches, service packs, or application components without verification the software component has been digitally signed using a certificate that is recognized and approved by the organization.

Severity	Group ID	Group Title	Version	Rule ID	Date	STIG Version
medium	V-268283	SRG-APP-000131-NDM-000243	HYCU-ND-000760	SV-268283r1038766_rule	2024-10-29	1

Description
Changes to any software components can have significant effects on the overall security of the network device. Verifying software components have been digitally signed using a certificate that is recognized and approved by the organization ensures the software has not been tampered with and has been provided by a trusted vendor. Accordingly, patches, service packs, or application components must be signed with a certificate recognized and approved by the organization. Verifying the authenticity of the software prior to installation validates the integrity of the patch or upgrade received from a vendor. This ensures the software has not been tampered with and has been provided by a trusted vendor. Self-signed certificates are disallowed by this requirement. The device should not have to verify the software again. This requirement does not mandate DOD certificates for this purpose; however, the certificate used to verify the software must be from an approved CA.

Description

Changes to any software components can have significant effects on the overall security of the network device. Verifying software components have been digitally signed using a certificate that is recognized and approved by the organization ensures the software has not been tampered with and has been provided by a trusted vendor. Accordingly, patches, service packs, or application components must be signed with a certificate recognized and approved by the organization. Verifying the authenticity of the software prior to installation validates the integrity of the patch or upgrade received from a vendor. This ensures the software has not been tampered with and has been provided by a trusted vendor. Self-signed certificates are disallowed by this requirement. The device should not have to verify the software again. This requirement does not mandate DOD certificates for this purpose; however, the certificate used to verify the software must be from an approved CA.

ℹ️ Check
Verify the operating system prevents the installation of patches, service packs, device drivers, or operating system components from a repository without verification that they have been digitally signed using a certificate that is recognized and approved by the organization. Check that YUM verifies the signature of packages from a repository prior to install with the following command: $ sudo grep -E '^\[.\]\|gpgcheck' /etc/yum.repos.d/.repo /etc/yum.repos.d/appstream.repo:[appstream] /etc/yum.repos.d/appstream.repo:gpgcheck=1 /etc/yum.repos.d/baseos.repo:[baseos] /etc/yum.repos.d/baseos.repo:gpgcheck=1 If "gpgcheck" is not set to "1", or if options are missing or commented out, this is a finding. Execute the following command to check the kernel and cryptographic libraries, as well as the SHA256 checksums of the application files: $ sudo /opt/grizzly/bin/hycu-selftest.sh If the output is not OK for the OS, this is a finding. If the output reports an error for any other file than /etc/issue for the App section, this is a finding.

ℹ️ Check

Verify the operating system prevents the installation of patches, service packs, device drivers, or operating system components from a repository without verification that they have been digitally signed using a certificate that is recognized and approved by the organization. Check that YUM verifies the signature of packages from a repository prior to install with the following command: $ sudo grep -E '^\[.*\]|gpgcheck' /etc/yum.repos.d/*.repo /etc/yum.repos.d/appstream.repo:[appstream] /etc/yum.repos.d/appstream.repo:gpgcheck=1 /etc/yum.repos.d/baseos.repo:[baseos] /etc/yum.repos.d/baseos.repo:gpgcheck=1 If "gpgcheck" is not set to "1", or if options are missing or commented out, this is a finding. Execute the following command to check the kernel and cryptographic libraries, as well as the SHA256 checksums of the application files: $ sudo /opt/grizzly/bin/hycu-selftest.sh If the output is not OK for the OS, this is a finding. If the output reports an error for any other file than /etc/issue for the App section, this is a finding.

✔️ Fix
Configure the operating system to verify the signature of packages from a repository prior to install by setting the following option in every repo file in /etc/yum.repos.d/: gpgcheck=1 Check the output of "sudo /opt/grizzly/bin/hycu-selftest.sh". Investigate each file listed in the error output to determine a fix.