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The system must be configured to require the use of a CAC, PIV compliant hardware token, or Alternate Logon Token (ALT) for authentication.


Finding ID Version Rule ID IA Controls Severity
V-218080 RHEL-06-000349 SV-218080r505923_rule Medium
Smart card login provides two-factor authentication stronger than that provided by a username/password combination. Smart cards leverage a PKI (public key infrastructure) in order to provide and verify credentials.
Red Hat Enterprise Linux 6 Security Technical Implementation Guide 2020-09-03


Check Text ( C-19561r377255_chk )
Interview the SA to determine if all accounts not exempted by policy are using CAC authentication. For DoD systems, the following systems and accounts are exempt from using smart card (CAC) authentication:

Standalone systems
Application accounts
Temporary employee accounts, such as students or interns, who cannot easily receive a CAC or PIV
Operational tactical locations that are not collocated with RAPIDS workstations to issue CAC or ALT
Test systems, such as those with an Interim Approval to Test (IATT) and use a separate VPN, firewall, or security measure preventing access to network and system components from outside the protection boundary documented in the IATT.

If non-exempt accounts are not using CAC authentication, this is a finding.
Fix Text (F-19559r377256_fix)
To enable smart card authentication, consult the documentation at:


For guidance on enabling SSH to authenticate against a Common Access Card (CAC), consult documentation at: