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

Documentable No

Rule ID SV-257822r1155615_rule

CCI References

CCI-003992CCI-001749

Discussion

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.

Check Procedure

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 Action

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/*