Title

If the system is using LDAP for authentication or account information, the system must use a TLS connection using FIPS 140-2 approved cryptographic algorithms. (Cat II impact)

Discussion

LDAP can be used to provide user authentication and account information, which are vital to system security. Communication between an LDAP server and a host using LDAP requires protection. Satisfies: SRG-OS-000250, SRG-OS-000495, SRG-OS-000500

Check Content

Check if the system is using NSS LDAP. # grep -v '^#' /etc/nsswitch.conf | grep ldap If no lines are returned, this vulnerability is not applicable. Verify TLS is used for client authentications to the server # grep "NS_LDAP_AUTH=" /var/ldap/ldap_client_file If any of the authentication methods used do not begin with "tls:", this is a finding. Retrieve the list of LDAP servers. # grep "NS_LDAP_SERVERS=" /var/ldap/client_file Use the certutil to verify the cipher(s) used for every server. # certutil -L -n < host nickname > -d /var/ldap If any of the TLS connections do not use FIPS 140-2 approved cryptographic algorithms, this is a finding.

Fix Text

Configure all LDAP authentications and connections to be encrypted using TLS and FIPS 140-2 approved cryptographic algorithms.

Additional Identifiers

Rule ID: SV-227968r603266_rule

Vulnerability ID: V-227968

Group Title: SRG-OS-000250

Expert Comments

CCIs tied to check.

Controls tied to check. These are derived from the CCIs shown above.