Vulnerability Discussion

Without cryptographic integrity protections, information can be altered by unauthorized users without detection.

Cryptographic mechanisms used for protecting the integrity of information include, for example, signed hash functions using asymmetric cryptography enabling distribution of the public key to verify the hash information while maintaining the confidentiality of the key used to generate the hash.

Check

If LDAP is not being utilized, this requirement is Not Applicable.

Verify the operating system implements cryptography to protect the integrity of remote LDAP access sessions.

To determine if LDAP is being used for authentication, use the following command:

# systemctl status sssd.service
sssd.service - System Security Services Daemon
Loaded: loaded (/usr/lib/systemd/system/sssd.service; enabled; vendor preset: disabled)
Active: active (running) since Wed 2018-06-27 10:58:11 EST; 1h 50min ago

If the "sssd.service" is "active", then LDAP is being used.

Determine the "id_provider" the LDAP is currently using:

# grep -i "id_provider" /etc/sssd/sssd.conf

id_provider = ad

If "id_provider" is set to "ad", this is Not Applicable.

Verify the sssd service is configured to require the use of certificates:

# grep -i tls_reqcert /etc/sssd/sssd.conf
ldap_tls_reqcert = demand

If the "ldap_tls_reqcert" setting is missing, commented out, or does not exist, this is a finding.

If the "ldap_tls_reqcert" setting is not set to "demand" or "hard", this is a finding.

Fix

Configure the operating system to implement cryptography to protect the integrity of LDAP remote access sessions.

Add or modify the following line in "/etc/sssd/sssd.conf":

ldap_tls_reqcert = demand