If the system is using LDAP for authentication or account information, the system must verify the LDAP servers certificate has not been revoked.

From Oracle Linux 5 Security Technical Implementation Guide

Associated with: CCI-000185

SV-63357r1_rule If the system is using LDAP for authentication or account information, the system must verify the LDAP servers certificate has not been revoked.

Vulnerability 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 authentication.

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 the NSS LDAP client is configured to check certificates against a certificate revocation list. # grep -i '^tls_crlcheck' /etc/ldap.conf If the setting does not exist, or the value is not "all", this is a finding.

Fix text

Edit "/etc/ldap.conf" and add or set the "tls_crlcheck" setting to "all".

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