Apache Directory LDAP API: LDAP client implementation does not verify if the server certificate matches the intended LDAP hostname

It was identified that the LDAP client implementation in version 2.1.7 does not verify if the server certificate matches the intended LDAP

hostname. While the underlying code validates the certificate chain

against a trusted authority, the absence of endpoint identification

allows a valid certificate issued for an entirely unrelated host to be

improperly accepted. This oversight leaves the connection highly

vulnerable to server impersonation and complete connection compromise.

The

root cause of this vulnerability lies in the incomplete TLS server

identity verification within the LDAP client implementation.

The attacker requires MITM capability on the network to exploit this vulnerability. This attacker must be able to present a certificate trusted by the client's configured trust store.

The hostname verification has been enforced in the new version of the LDAP API