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Description of problem:

As per man sssd-ldap : 

ldap_access_filter (string)
  If using access_provider = ldap, this option is mandatory. It specifies an LDAP search filter criteria that must be met for the user to be granted access on this host. If access_provider = ldap and this option is not set, it will result in all users being denied access. Use access_provider = allow to change this default behavior.

The option 'ldap_access_filter' is not mandatory if we use ldap_access_order = <something other than filter>

Upstream ticket:
https://fedorahosted.org/sssd/ticket/1540

Verified in version 1.9.2-74 in man sssd-ldap

Updated text:
If using access_provider = ldap and ldap_access_order = filter (default), this option is mandatory.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

http://rhn.redhat.com/errata/RHSA-2013-0508.html