Ubuntu 22.04 LTS must implement smart card logins for multifactor authentication for local and network access to privileged and nonprivileged accounts.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-260575 | UBTU-22-612020 | SV-260575r1044770_rule | CCI-000765 | medium |
| Description | ||||
| Without the use of multifactor authentication, the ease of access to privileged functions is greatly increased. Multifactor authentication requires using two or more factors to achieve authentication. Factors include: 1) Something a user knows (e.g., password/PIN); 2) Something a user has (e.g., cryptographic identification device, token); and 3) Something a user is (e.g., biometric). A privileged account is defined as an information system account with authorizations of a privileged user. Network access is defined as access to an information system by a user (or a process acting on behalf of a user) communicating through a network (e.g., local area network, wide area network, or the internet). The DOD common access card (CAC) with DOD-approved PKI is an example of multifactor authentication. Satisfies: SRG-OS-000105-GPOS-00052, SRG-OS-000106-GPOS-00053, SRG-OS-000107-GPOS-00054, SRG-OS-000108-GPOS-00055 | ||||
| STIG | Date | |||
| Canonical Ubuntu 22.04 LTS Security Technical Implementation Guide | 2025-05-16 | |||
Details
Check Text (C-260575r1044770_chk)
Verify that the "pam_pkcs11.so" module is configured by using the following command:
$ grep -i pam_pkcs11.so /etc/pam.d/common-auth
auth [success=3 default=ignore] pam_pkcs11.so
If "pam_pkcs11.so" is commented out or is missing, this is a finding.
Verify the sshd daemon allows public key authentication by using the following command:
$ sudo /usr/sbin/sshd -dd 2>&1 | awk '/filename/ {print $4}' | tr -d '\r' | tr '\n' ' ' | xargs sudo grep -iH 'pubkeyauthentication'
/etc/ssh/sshd_config:PubkeyAuthentication yes
If "PubkeyAuthentication" is not set to "yes" or is commented out or missing, or if conflicting results are returned, this is a finding.
Fix Text (F-64212r1044769_fix)
Configure Ubuntu 22.04 LTS to use multifactor authentication for access to accounts.
Add or modify the following line in the "/etc/pam.d/common-auth" file:
auth [success=3 default=ignore] pam_pkcs11.so
Add or modify the following line in the "/etc/ssh/sshd_config" file:
PubkeyAuthentication yes