STIGQter: STIG Summary: Canonical Ubuntu 24.04 LTS Security Technical Implementation Guide Version: 1 Release: 6 Benchmark Date: 01 Jul 2026:

Ubuntu 24.04 LTS, for PKI-based authentication, Privileged Access Management (PAM) must validate certificates by constructing a certification path (which includes status information) to an accepted trust anchor.

DISA Rule

SV-270737r1067178_rule

Vulnerability Number

V-270737

Group Title

SRG-OS-000066-GPOS-00034

Rule Version

UBTU-24-400375

Severity

CAT II

CCI(s)

• CCI-000185 - For public key-based authentication, validate certificates by constructing and verifying a certification path to an accepted trust anchor including checking certificate status information.
• CCI-004909 - Include only approved trust anchors in trust stores or certificate stores managed by the organization.

Weight

10

Fix Recommendation

Configure Ubuntu 24.04 LTS, for PKI-based authentication, to validate certificates by constructing a certification path to an accepted trust anchor.

Determine which pkcs11 module is being used via the "use_pkcs11_module" in "/etc/pam_pkcs11/pam_pkcs11.conf" and ensure "ca" is enabled in "cert_policy".

Add or update the "cert_policy" to ensure "ca" is enabled:

cert_policy = ca,signature,ocsp_on;

If the system is missing an "/etc/pam_pkcs11/" directory and an "/etc/pam_pkcs11/pam_pkcs11.conf", find an example to copy into place and modify accordingly at "https://manpages.ubuntu.com/manpages/xenial/man8/pam_pkcs11.8.html".

Check Contents

Verify Ubuntu 24.04 LTS, for PKI-based authentication, has valid certificates by constructing a certification path to an accepted trust anchor.

Determine which pkcs11 module is being used via the "use_pkcs11_module" in "/etc/pam_pkcs11/pam_pkcs11.conf" and then ensure "ca" is enabled in "cert_policy" with the following command:

$ sudo grep use_pkcs11_module /etc/pam_pkcs11/pam_pkcs11.conf | awk '/pkcs11_module opensc {/,/}/' /etc/pam_pkcs11/pam_pkcs11.conf | grep cert_policy | grep ca

cert_policy = ca,signature,ocsp_on;

If "cert_policy" is not set to "ca" or the line is commented out, this is a finding.

Vulnerability Number

V-270737

Documentable

False

Rule Version

UBTU-24-400375

Severity Override Guidance

Verify Ubuntu 24.04 LTS, for PKI-based authentication, has valid certificates by constructing a certification path to an accepted trust anchor.

Determine which pkcs11 module is being used via the "use_pkcs11_module" in "/etc/pam_pkcs11/pam_pkcs11.conf" and then ensure "ca" is enabled in "cert_policy" with the following command:

$ sudo grep use_pkcs11_module /etc/pam_pkcs11/pam_pkcs11.conf | awk '/pkcs11_module opensc {/,/}/' /etc/pam_pkcs11/pam_pkcs11.conf | grep cert_policy | grep ca

cert_policy = ca,signature,ocsp_on;

If "cert_policy" is not set to "ca" or the line is commented out, this is a finding.

Check Content Reference

M

Target Key

5673