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is using LDAP for authentication or account information, the system must verify the LDAP server's certificate has not been revoked.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-22558	GEN008040	SV-37634r1_rule	DCNR-1	Medium

Description
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.

STIG	Date
Red Hat Enterprise Linux 5 Security Technical Implementation Guide	2017-03-01

Details

Check Text ( C-36834r1_chk )
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 (F-31672r1_fix)
Edit "/etc/ldap.conf" and add or set the "tls_crlcheck" setting to "all".