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Category:   Application (File Transfer/Sharing)  >   Samba Vendors:   Samba.org
(Red Hat Issues Fix) Samba Lets Remote Users Downgrade SMB Signing Security Protections on the Target System
SecurityTracker Alert ID:  1036444
SecurityTracker URL:  http://securitytracker.com/id/1036444
CVE Reference:   CVE-2016-2119   (Links to External Site)
Date:  Jul 26 2016
Impact:   Disclosure of system information, Disclosure of user information, Modification of system information, Modification of user information
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 4.0.0 to 4.4.4
Description:   A vulnerability was reported in Samba. A remote user can downgrade client signing security controls on the target system.

A remote user that can conduct a man-in-the-middle attack can inject the SMB2_SESSION_FLAG_IS_GUEST or SMB2_SESSION_FLAG_IS_NULL flags to downgrade the client's configuration-required signing protections for SMB2 or SMB3 client connections and impersonate the target server.

Clients that are configured to use SMB signing are affected.

Management tools (e.g., net, samba-tool, rpcclient) that use DCERPC over SMB2/3 connections are also affected.

Stefan Metzmacher of SerNet (https://samba.plus) and the Samba Team (https://www.samba.org) reported this vulnerability.

Impact:   A remote user that can conduct a man-in-the-middle attack can downgrade client signing security controls on the target system.
Solution:   Red Hat has issued a fix for samba4.

The Red Hat advisory is available at:

https://rhn.redhat.com/errata/RHSA-2016-1487.html

Vendor URL:  rhn.redhat.com/errata/RHSA-2016-1487.html (Links to External Site)
Cause:   State error
Underlying OS:  Linux (Red Hat Enterprise)
Underlying OS Comments:  6

Message History:   This archive entry is a follow-up to the message listed below.
Jul 7 2016 Samba Lets Remote Users Downgrade SMB Signing Security Protections on the Target System



 Source Message Contents

Subject:  [RHSA-2016:1487-01] Moderate: samba4 security update

-----BEGIN PGP SIGNED MESSAGE-----
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=====================================================================
                   Red Hat Security Advisory

Synopsis:          Moderate: samba4 security update
Advisory ID:       RHSA-2016:1487-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2016-1487.html
Issue date:        2016-07-26
CVE Names:         CVE-2016-2119 
=====================================================================

1. Summary:

An update for samba4 is now available for Red Hat Enterprise Linux 6.

Red Hat Product Security has rated this update as having a security impact
of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which
gives a detailed severity rating, is available for each vulnerability from
the CVE link(s) in the References section.

2. Relevant releases/architectures:

Red Hat Enterprise Linux Desktop (v. 6) - i386, x86_64
Red Hat Enterprise Linux HPC Node (v. 6) - x86_64
Red Hat Enterprise Linux Server (v. 6) - i386, ppc64, s390x, x86_64
Red Hat Enterprise Linux Workstation (v. 6) - i386, x86_64

3. Description:

Samba is an open-source implementation of the Server Message Block (SMB) or
Common Internet File System (CIFS) protocol, which allows PC-compatible
machines to share files, printers, and other information.

Security Fix(es):

* A flaw was found in the way Samba initiated signed DCE/RPC connections. A
man-in-the-middle attacker could use this flaw to downgrade the connection
to not use signing and therefore impersonate the server. (CVE-2016-2119)

Red Hat would like to thank the Samba project for reporting this issue.
Upstream acknowledges Stefan Metzmacher as the original reporter.

4. Solution:

For details on how to apply this update, which includes the changes
described in this advisory, refer to:

https://access.redhat.com/articles/11258

After installing this update, the smb service will be restarted
automatically.

5. Bugs fixed (https://bugzilla.redhat.com/):

1351955 - CVE-2016-2119 samba: Client side SMB2/3 required signing can be downgraded

6. Package List:

Red Hat Enterprise Linux Desktop (v. 6):

Source:
samba4-4.2.10-7.el6_8.src.rpm

i386:
samba4-4.2.10-7.el6_8.i686.rpm
samba4-client-4.2.10-7.el6_8.i686.rpm
samba4-common-4.2.10-7.el6_8.i686.rpm
samba4-dc-4.2.10-7.el6_8.i686.rpm
samba4-dc-libs-4.2.10-7.el6_8.i686.rpm
samba4-debuginfo-4.2.10-7.el6_8.i686.rpm
samba4-devel-4.2.10-7.el6_8.i686.rpm
samba4-libs-4.2.10-7.el6_8.i686.rpm
samba4-pidl-4.2.10-7.el6_8.i686.rpm
samba4-python-4.2.10-7.el6_8.i686.rpm
samba4-test-4.2.10-7.el6_8.i686.rpm
samba4-winbind-4.2.10-7.el6_8.i686.rpm
samba4-winbind-clients-4.2.10-7.el6_8.i686.rpm
samba4-winbind-krb5-locator-4.2.10-7.el6_8.i686.rpm

x86_64:
samba4-4.2.10-7.el6_8.x86_64.rpm
samba4-client-4.2.10-7.el6_8.x86_64.rpm
samba4-common-4.2.10-7.el6_8.x86_64.rpm
samba4-dc-4.2.10-7.el6_8.x86_64.rpm
samba4-dc-libs-4.2.10-7.el6_8.x86_64.rpm
samba4-debuginfo-4.2.10-7.el6_8.x86_64.rpm
samba4-devel-4.2.10-7.el6_8.x86_64.rpm
samba4-libs-4.2.10-7.el6_8.x86_64.rpm
samba4-pidl-4.2.10-7.el6_8.x86_64.rpm
samba4-python-4.2.10-7.el6_8.x86_64.rpm
samba4-test-4.2.10-7.el6_8.x86_64.rpm
samba4-winbind-4.2.10-7.el6_8.x86_64.rpm
samba4-winbind-clients-4.2.10-7.el6_8.x86_64.rpm
samba4-winbind-krb5-locator-4.2.10-7.el6_8.x86_64.rpm

Red Hat Enterprise Linux HPC Node (v. 6):

Source:
samba4-4.2.10-7.el6_8.src.rpm

x86_64:
samba4-4.2.10-7.el6_8.x86_64.rpm
samba4-client-4.2.10-7.el6_8.x86_64.rpm
samba4-common-4.2.10-7.el6_8.x86_64.rpm
samba4-dc-4.2.10-7.el6_8.x86_64.rpm
samba4-dc-libs-4.2.10-7.el6_8.x86_64.rpm
samba4-debuginfo-4.2.10-7.el6_8.x86_64.rpm
samba4-devel-4.2.10-7.el6_8.x86_64.rpm
samba4-libs-4.2.10-7.el6_8.x86_64.rpm
samba4-pidl-4.2.10-7.el6_8.x86_64.rpm
samba4-python-4.2.10-7.el6_8.x86_64.rpm
samba4-test-4.2.10-7.el6_8.x86_64.rpm
samba4-winbind-4.2.10-7.el6_8.x86_64.rpm
samba4-winbind-clients-4.2.10-7.el6_8.x86_64.rpm
samba4-winbind-krb5-locator-4.2.10-7.el6_8.x86_64.rpm

Red Hat Enterprise Linux Server (v. 6):

Source:
samba4-4.2.10-7.el6_8.src.rpm

i386:
samba4-4.2.10-7.el6_8.i686.rpm
samba4-client-4.2.10-7.el6_8.i686.rpm
samba4-common-4.2.10-7.el6_8.i686.rpm
samba4-dc-4.2.10-7.el6_8.i686.rpm
samba4-dc-libs-4.2.10-7.el6_8.i686.rpm
samba4-debuginfo-4.2.10-7.el6_8.i686.rpm
samba4-devel-4.2.10-7.el6_8.i686.rpm
samba4-libs-4.2.10-7.el6_8.i686.rpm
samba4-pidl-4.2.10-7.el6_8.i686.rpm
samba4-python-4.2.10-7.el6_8.i686.rpm
samba4-test-4.2.10-7.el6_8.i686.rpm
samba4-winbind-4.2.10-7.el6_8.i686.rpm
samba4-winbind-clients-4.2.10-7.el6_8.i686.rpm
samba4-winbind-krb5-locator-4.2.10-7.el6_8.i686.rpm

ppc64:
samba4-4.2.10-7.el6_8.ppc64.rpm
samba4-client-4.2.10-7.el6_8.ppc64.rpm
samba4-common-4.2.10-7.el6_8.ppc64.rpm
samba4-dc-4.2.10-7.el6_8.ppc64.rpm
samba4-dc-libs-4.2.10-7.el6_8.ppc64.rpm
samba4-debuginfo-4.2.10-7.el6_8.ppc64.rpm
samba4-devel-4.2.10-7.el6_8.ppc64.rpm
samba4-libs-4.2.10-7.el6_8.ppc64.rpm
samba4-pidl-4.2.10-7.el6_8.ppc64.rpm
samba4-python-4.2.10-7.el6_8.ppc64.rpm
samba4-test-4.2.10-7.el6_8.ppc64.rpm
samba4-winbind-4.2.10-7.el6_8.ppc64.rpm
samba4-winbind-clients-4.2.10-7.el6_8.ppc64.rpm
samba4-winbind-krb5-locator-4.2.10-7.el6_8.ppc64.rpm

s390x:
samba4-4.2.10-7.el6_8.s390x.rpm
samba4-client-4.2.10-7.el6_8.s390x.rpm
samba4-common-4.2.10-7.el6_8.s390x.rpm
samba4-dc-4.2.10-7.el6_8.s390x.rpm
samba4-dc-libs-4.2.10-7.el6_8.s390x.rpm
samba4-debuginfo-4.2.10-7.el6_8.s390x.rpm
samba4-devel-4.2.10-7.el6_8.s390x.rpm
samba4-libs-4.2.10-7.el6_8.s390x.rpm
samba4-pidl-4.2.10-7.el6_8.s390x.rpm
samba4-python-4.2.10-7.el6_8.s390x.rpm
samba4-test-4.2.10-7.el6_8.s390x.rpm
samba4-winbind-4.2.10-7.el6_8.s390x.rpm
samba4-winbind-clients-4.2.10-7.el6_8.s390x.rpm
samba4-winbind-krb5-locator-4.2.10-7.el6_8.s390x.rpm

x86_64:
samba4-4.2.10-7.el6_8.x86_64.rpm
samba4-client-4.2.10-7.el6_8.x86_64.rpm
samba4-common-4.2.10-7.el6_8.x86_64.rpm
samba4-dc-4.2.10-7.el6_8.x86_64.rpm
samba4-dc-libs-4.2.10-7.el6_8.x86_64.rpm
samba4-debuginfo-4.2.10-7.el6_8.x86_64.rpm
samba4-devel-4.2.10-7.el6_8.x86_64.rpm
samba4-libs-4.2.10-7.el6_8.x86_64.rpm
samba4-pidl-4.2.10-7.el6_8.x86_64.rpm
samba4-python-4.2.10-7.el6_8.x86_64.rpm
samba4-test-4.2.10-7.el6_8.x86_64.rpm
samba4-winbind-4.2.10-7.el6_8.x86_64.rpm
samba4-winbind-clients-4.2.10-7.el6_8.x86_64.rpm
samba4-winbind-krb5-locator-4.2.10-7.el6_8.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 6):

Source:
samba4-4.2.10-7.el6_8.src.rpm

i386:
samba4-4.2.10-7.el6_8.i686.rpm
samba4-client-4.2.10-7.el6_8.i686.rpm
samba4-common-4.2.10-7.el6_8.i686.rpm
samba4-dc-4.2.10-7.el6_8.i686.rpm
samba4-dc-libs-4.2.10-7.el6_8.i686.rpm
samba4-debuginfo-4.2.10-7.el6_8.i686.rpm
samba4-devel-4.2.10-7.el6_8.i686.rpm
samba4-libs-4.2.10-7.el6_8.i686.rpm
samba4-pidl-4.2.10-7.el6_8.i686.rpm
samba4-python-4.2.10-7.el6_8.i686.rpm
samba4-test-4.2.10-7.el6_8.i686.rpm
samba4-winbind-4.2.10-7.el6_8.i686.rpm
samba4-winbind-clients-4.2.10-7.el6_8.i686.rpm
samba4-winbind-krb5-locator-4.2.10-7.el6_8.i686.rpm

x86_64:
samba4-4.2.10-7.el6_8.x86_64.rpm
samba4-client-4.2.10-7.el6_8.x86_64.rpm
samba4-common-4.2.10-7.el6_8.x86_64.rpm
samba4-dc-4.2.10-7.el6_8.x86_64.rpm
samba4-dc-libs-4.2.10-7.el6_8.x86_64.rpm
samba4-debuginfo-4.2.10-7.el6_8.x86_64.rpm
samba4-devel-4.2.10-7.el6_8.x86_64.rpm
samba4-libs-4.2.10-7.el6_8.x86_64.rpm
samba4-pidl-4.2.10-7.el6_8.x86_64.rpm
samba4-python-4.2.10-7.el6_8.x86_64.rpm
samba4-test-4.2.10-7.el6_8.x86_64.rpm
samba4-winbind-4.2.10-7.el6_8.x86_64.rpm
samba4-winbind-clients-4.2.10-7.el6_8.x86_64.rpm
samba4-winbind-krb5-locator-4.2.10-7.el6_8.x86_64.rpm

These packages are GPG signed by Red Hat for security.  Our key and
details on how to verify the signature are available from
https://access.redhat.com/security/team/key/

7. References:

https://access.redhat.com/security/cve/CVE-2016-2119
https://access.redhat.com/security/updates/classification/#moderate

8. Contact:

The Red Hat security contact is <secalert@redhat.com>. More contact
details at https://access.redhat.com/security/team/contact/

Copyright 2016 Red Hat, Inc.
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