Check: UBTU-20-010033
Canonical Ubuntu 20.04 LTS STIG:
UBTU-20-010033
(in versions v1 r11 through v1 r9)
Title
The Ubuntu operating system must implement smart card logins for multifactor authentication for local and network access to privileged and non-privileged accounts. (Cat II impact)
Discussion
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 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
Check Content
Verify the Ubuntu operating system has the packages required for multifactor authentication installed with the following commands: $ dpkg -l | grep libpam-pkcs11 ii libpam-pkcs11 0.6.8-4 amd64 Fully featured PAM module for using PKCS#11 smart cards If the "libpam-pkcs11" package is not installed, this is a finding. Verify the sshd daemon allows public key authentication with the following command: $ grep -ir pubkeyauthentication /etc/ssh/sshd_config* PubkeyAuthentication yes If this option is set to "no" or is missing, this is a finding. If conflicting results are returned, this is a finding.
Fix Text
Configure the Ubuntu operating system to use multifactor authentication for network access to accounts. Add or update "pam_pkcs11.so" in "/etc/pam.d/common-auth" to match the following line: auth [success=2 default=ignore] pam_pkcs11.so Set the sshd option "PubkeyAuthentication yes" in the "/etc/ssh/sshd_config" file.
Additional Identifiers
Rule ID: SV-238210r917810_rule
Vulnerability ID: V-238210
Group Title: SRG-OS-000105-GPOS-00052
Expert Comments
CCIs
Number | Definition |
---|---|
CCI-000765 |
The information system implements multifactor authentication for network access to privileged accounts. |
CCI-000766 |
The information system implements multifactor authentication for network access to non-privileged accounts. |
CCI-000767 |
The information system implements multifactor authentication for local access to privileged accounts. |
CCI-000768 |
The information system implements multifactor authentication for local access to non-privileged accounts. |