RHEL 9 must have GPG signature verification enabled for all software repositories.

Severity	Group ID	Group Title	Version	Rule ID	Date	STIG Version
high	V-257822	SRG-OS-000366-GPOS-00153	RHEL-09-214025	SV-257822r1155615_rule	2025-11-24	2

Description
Changes to any software components can have significant effects on the overall security of the operating system. This requirement ensures the software has not been tampered with and that it has been provided by a trusted vendor. All software packages must be signed with a cryptographic key recognized and approved by the organization. Verifying the authenticity of software prior to installation validates the integrity of the software package received from a vendor. This verifies the software has not been tampered with and that it has been provided by a trusted vendor.

Description

Changes to any software components can have significant effects on the overall security of the operating system. This requirement ensures the software has not been tampered with and that it has been provided by a trusted vendor. All software packages must be signed with a cryptographic key recognized and approved by the organization. Verifying the authenticity of software prior to installation validates the integrity of the software package received from a vendor. This verifies the software has not been tampered with and that it has been provided by a trusted vendor.

ℹ️ Check
Verify all software repositories defined in "/etc/yum.repos.d/" have been configured with "gpgcheck" enabled: $ grep -w gpgcheck /etc/yum.repos.d/*.repo \| more /etc/yum.repos.d/redhat.repo:gpgcheck = 1 For all listed repos, if "gpgcheck" is not set to "1", or if the option is missing or commented out, ask the system administrator how the GPG signatures of local software packages are being verified. If there is no process to verify GPG signatures that is approved by the organization, this is a finding.

ℹ️ Check

Verify all software repositories defined in "/etc/yum.repos.d/" have been configured with "gpgcheck" enabled: $ grep -w gpgcheck /etc/yum.repos.d/*.repo | more /etc/yum.repos.d/redhat.repo:gpgcheck = 1 For all listed repos, if "gpgcheck" is not set to "1", or if the option is missing or commented out, ask the system administrator how the GPG signatures of local software packages are being verified. If there is no process to verify GPG signatures that is approved by the organization, this is a finding.

✔️ Fix
Configure all software repositories defined in "/etc/yum.repos.d/" to have "gpgcheck" enabled: $ sudo sed -i 's/gpgcheck\s=./gpgcheck=1/g' /etc/yum.repos.d/*