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6 <title>Samba - Release Notes Archive</title>
11 <H2>Samba 4.1.3 Available for Download</H2>
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16 Release Notes for Samba 4.1.3
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21 This is a security release in order to address
22 CVE-2013-4408 (DCE-RPC fragment length field is incorrectly checked) and
23 CVE-2012-6150 (pam_winbind login without require_membership_of restrictions).
26 Samba versions 3.4.0 and above (versions 3.4.0 - 3.4.17, 3.5.0 -
27 3.5.22, 3.6.0 - 3.6.21, 4.0.0 - 4.0.12 and including 4.1.2) are
28 vulnerable to buffer overrun exploits in the client processing of
29 DCE-RPC packets. This is due to incorrect checking of the DCE-RPC
30 fragment length in the client code.
32 This is a critical vulnerability as the DCE-RPC client code is part of
33 the winbindd authentication and identity mapping daemon, which is
34 commonly configured as part of many server installations (when joined
35 to an Active Directory Domain). A malicious Active Directory Domain
36 Controller or man-in-the-middle attacker impersonating an Active
37 Directory Domain Controller could achieve root-level access by
38 compromising the winbindd process.
40 Samba server versions 3.4.0 - 3.4.17 and versions 3.5.0 - 3.5.22 are
41 also vulnerable to a denial of service attack (server crash) due to a
42 similar error in the server code of those versions.
44 Samba server versions 3.6.0 and above (including all 3.6.x versions,
45 all 4.0.x versions and 4.1.x) are not vulnerable to this problem.
47 In addition range checks were missing on arguments returned from calls
48 to the DCE-RPC functions LookupSids (lsa and samr), LookupNames (lsa and samr)
49 and LookupRids (samr) which could also cause similar problems.
51 As this was found during an internal audit of the Samba code there are
52 no currently known exploits for this problem (as of December 9th 2013).
55 Winbind allows for the further restriction of authenticated PAM logins using
56 the require_membership_of parameter. System administrators may specify a list
57 of SIDs or groups for which an authenticated user must be a member of. If an
58 authenticated user does not belong to any of the entries, then login should
59 fail. Invalid group name entries are ignored.
61 Samba versions 3.3.10, 3.4.3, 3.5.0 and later incorrectly allow login from
62 authenticated users if the require_membership_of parameter specifies only
65 This is a vulnerability with low impact. All require_membership_of group
66 names must be invalid for this bug to be encountered.
72 o Jeremy Allison <jra@samba.org>
73 * BUG 10185: CVE-2013-4408: Correctly check DCE-RPC fragment length field.
76 o Stefan Metzmacher <metze@samba.org>
77 * BUG 10185: CVE-2013-4408: Correctly check DCE-RPC fragment length field.
80 o Noel Power <noel.power@suse.com>
81 * BUGs 10300, 10306: CVE-2012-6150: Fail authentication if user isn't
82 member of *any* require_membership_of specified groups.