Samba 4.0.13 Available for Download

                   Release Notes for Samba 4.0.13
                          December 9, 2013

This is a security release in order to address
CVE-2013-4408 (DCE-RPC fragment length field is incorrectly checked) and
CVE-2012-6150 (pam_winbind login without require_membership_of restrictions).

o  CVE-2013-4408:
   Samba versions 3.4.0 and above (versions 3.4.0 - 3.4.17, 3.5.0 -
   3.5.22, 3.6.0 - 3.6.21, 4.0.0 - 4.0.12 and including 4.1.2) are
   vulnerable to buffer overrun exploits in the client processing of
   DCE-RPC packets. This is due to incorrect checking of the DCE-RPC
   fragment length in the client code.

   This is a critical vulnerability as the DCE-RPC client code is part of
   the winbindd authentication and identity mapping daemon, which is
   commonly configured as part of many server installations (when joined
   to an Active Directory Domain). A malicious Active Directory Domain
   Controller or man-in-the-middle attacker impersonating an Active
   Directory Domain Controller could achieve root-level access by
   compromising the winbindd process.

   Samba server versions 3.4.0 - 3.4.17 and versions 3.5.0 - 3.5.22 are
   also vulnerable to a denial of service attack (server crash) due to a
   similar error in the server code of those versions.

   Samba server versions 3.6.0 and above (including all 3.6.x versions,
   all 4.0.x versions and 4.1.x) are not vulnerable to this problem.

   In addition range checks were missing on arguments returned from calls
   to the DCE-RPC functions LookupSids (lsa and samr), LookupNames (lsa and samr)
   and LookupRids (samr) which could also cause similar problems.

   As this was found during an internal audit of the Samba code there are
   no currently known exploits for this problem (as of December 9th 2013).

o  CVE-2012-6150:
   Winbind allows for the further restriction of authenticated PAM logins using
   the require_membership_of parameter. System administrators may specify a list
   of SIDs or groups for which an authenticated user must be a member of. If an
   authenticated user does not belong to any of the entries, then login should
   fail. Invalid group name entries are ignored.

   Samba versions 3.3.10, 3.4.3, 3.5.0 and later incorrectly allow login from
   authenticated users if the require_membership_of parameter specifies only
   invalid group names.

   This is a vulnerability with low impact. All require_membership_of group
   names must be invalid for this bug to be encountered.

Changes since 4.0.12:

o   Jeremy Allison <>
    * BUG 10185: CVE-2013-4408: Correctly check DCE-RPC fragment length field.

o   Stefan Metzmacher <>
    * BUG 10185: CVE-2013-4408: Correctly check DCE-RPC fragment length field.

o   Noel Power <>
    * BUGs 10300, 10306: CVE-2012-6150: Fail authentication if user isn't
      member of *any* require_membership_of specified groups.