Red Hat Bugzilla – Bug 161991
openldap password disclosure issue
Last modified: 2007-11-30 17:11:09 EST
+++ This bug was initially created as a clone of Bug #161990 +++
Openldap currently doesn't allow a client to specify that referred
connections should use TLS. This can lead to passwords being sent in the
clear despite having "ssl start_tls" in ldap.conf.
In a master+slaves LDAP infrastructure passwords are sent in the clear
when a user runs "passwd" on a machine where pam_ldap is configured to
use a slave server.
pam_ldap connects to the slave over TLS (as specified in the ldap.conf
file) and then gets referred to the master in order to make a change.
TLS is never started on the referred connection and pam_ldap attempts to
bind in the clear. If the master server is not setup to require TLS on
all connections, this may go unoticed, as passwd will function as
The only place a client is able to try and start_tls for a referred
connection is inside rebind_proc. However, a bug in a sanity check in
the openldap code means that openldap considers that TLS has already
been started on the referrred connection if it has been started on the
first connection (it always checks the first connection, rather than
checking the default), and so this won't work.
Bugs have been filed on both openldap and pam_ldap:
This issue probably also affects FC3
This report targets the FC3 or FC4 products, which have now been EOL'd.
Could you please check that it still applies to a current Fedora release, and
either update the target product or close it ?
This has been fixed long time ago. Current FC5 and FC6 should be safe.