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

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-257822	RHEL-09-214025	SV-257822r1044880_rule		High

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.

STIG	Date
Red Hat Enterprise Linux 9 Security Technical Implementation Guide	2024-12-04

Details

Check Text (C-61563r1044879_chk)

Verify that all software repositories defined in "/etc/yum.repos.d/" have been configured with "gpgcheck" enabled:

$ grep -w gpgcheck /etc/yum.repos.d/*.repo | more

gpgcheck = 1

If "gpgcheck" is not set to "1" for all returned lines, this is a finding.

Fix Text (F-61487r925452_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/*