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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:  1036448
SecurityTracker URL:  http://securitytracker.com/id/1036448
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.

The Red Hat advisory is available at:

https://rhn.redhat.com/errata/RHSA-2016-1494.html

Vendor URL:  rhn.redhat.com/errata/RHSA-2016-1494.html (Links to External Site)
Cause:   State error
Underlying OS:  Linux (Red Hat Enterprise)

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-2016:1494-01] Moderate: samba security update

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

Synopsis:          Moderate: samba security update
Advisory ID:       RHSA-2016:1494-01
Product:           Red Hat Gluster Storage
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2016-1494.html
Issue date:        2016-07-26
CVE Names:         CVE-2016-2119 
=====================================================================

1. Summary:

An update for samba is now available for Red Hat Gluster Storage 3.1 for
RHEL 6 and Red Hat Gluster Storage 3.1 for RHEL 7.

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 Gluster 3 Samba on RHEL-6 - noarch, x86_64
Red Hat Gluster 3 Samba on RHEL-7 - noarch, x86_64

3. Description:

Samba is an open-source implementation of the Server Message Block (SMB)
protocol and the related Common Internet File System (CIFS) protocol, which
allow PC-compatible machines to share files, printers, and various
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 Gluster 3 Samba on RHEL-6:

Source:
samba-4.4.3-8.el6rhs.src.rpm

noarch:
samba-common-4.4.3-8.el6rhs.noarch.rpm
samba-pidl-4.4.3-8.el6rhs.noarch.rpm

x86_64:
ctdb-4.4.3-8.el6rhs.x86_64.rpm
ctdb-tests-4.4.3-8.el6rhs.x86_64.rpm
libsmbclient-4.4.3-8.el6rhs.x86_64.rpm
libsmbclient-devel-4.4.3-8.el6rhs.x86_64.rpm
libwbclient-4.4.3-8.el6rhs.x86_64.rpm
libwbclient-devel-4.4.3-8.el6rhs.x86_64.rpm
samba-4.4.3-8.el6rhs.x86_64.rpm
samba-client-4.4.3-8.el6rhs.x86_64.rpm
samba-client-libs-4.4.3-8.el6rhs.x86_64.rpm
samba-common-libs-4.4.3-8.el6rhs.x86_64.rpm
samba-common-tools-4.4.3-8.el6rhs.x86_64.rpm
samba-dc-4.4.3-8.el6rhs.x86_64.rpm
samba-dc-libs-4.4.3-8.el6rhs.x86_64.rpm
samba-debuginfo-4.4.3-8.el6rhs.x86_64.rpm
samba-devel-4.4.3-8.el6rhs.x86_64.rpm
samba-libs-4.4.3-8.el6rhs.x86_64.rpm
samba-python-4.4.3-8.el6rhs.x86_64.rpm
samba-test-4.4.3-8.el6rhs.x86_64.rpm
samba-test-libs-4.4.3-8.el6rhs.x86_64.rpm
samba-vfs-glusterfs-4.4.3-8.el6rhs.x86_64.rpm
samba-winbind-4.4.3-8.el6rhs.x86_64.rpm
samba-winbind-clients-4.4.3-8.el6rhs.x86_64.rpm
samba-winbind-krb5-locator-4.4.3-8.el6rhs.x86_64.rpm
samba-winbind-modules-4.4.3-8.el6rhs.x86_64.rpm

Red Hat Gluster 3 Samba on RHEL-7:

Source:
samba-4.4.3-8.el7rhgs.src.rpm

noarch:
samba-common-4.4.3-8.el7rhgs.noarch.rpm
samba-pidl-4.4.3-8.el7rhgs.noarch.rpm

x86_64:
ctdb-4.4.3-8.el7rhgs.x86_64.rpm
ctdb-tests-4.4.3-8.el7rhgs.x86_64.rpm
libsmbclient-4.4.3-8.el7rhgs.x86_64.rpm
libsmbclient-devel-4.4.3-8.el7rhgs.x86_64.rpm
libwbclient-4.4.3-8.el7rhgs.x86_64.rpm
libwbclient-devel-4.4.3-8.el7rhgs.x86_64.rpm
samba-4.4.3-8.el7rhgs.x86_64.rpm
samba-client-4.4.3-8.el7rhgs.x86_64.rpm
samba-client-libs-4.4.3-8.el7rhgs.x86_64.rpm
samba-common-libs-4.4.3-8.el7rhgs.x86_64.rpm
samba-common-tools-4.4.3-8.el7rhgs.x86_64.rpm
samba-dc-4.4.3-8.el7rhgs.x86_64.rpm
samba-dc-libs-4.4.3-8.el7rhgs.x86_64.rpm
samba-debuginfo-4.4.3-8.el7rhgs.x86_64.rpm
samba-devel-4.4.3-8.el7rhgs.x86_64.rpm
samba-libs-4.4.3-8.el7rhgs.x86_64.rpm
samba-python-4.4.3-8.el7rhgs.x86_64.rpm
samba-test-4.4.3-8.el7rhgs.x86_64.rpm
samba-test-libs-4.4.3-8.el7rhgs.x86_64.rpm
samba-vfs-glusterfs-4.4.3-8.el7rhgs.x86_64.rpm
samba-winbind-4.4.3-8.el7rhgs.x86_64.rpm
samba-winbind-clients-4.4.3-8.el7rhgs.x86_64.rpm
samba-winbind-krb5-locator-4.4.3-8.el7rhgs.x86_64.rpm
samba-winbind-modules-4.4.3-8.el7rhgs.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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