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Category:   Application (File Transfer/Sharing)  >   Samba Vendors:   Samba.org
(Oracle Issues Fix for Oracle Linux) Samba Lets Remote Users Downgrade SMB Signing Security Protections on the Target System
SecurityTracker Alert ID:  1036450
SecurityTracker URL:  http://securitytracker.com/id/1036450
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:   Oracle has issued a fix.

The Oracle Linux advisory is available at:

http://linux.oracle.com/errata/ELSA-2016-1486.html

Vendor URL:  linux.oracle.com/errata/ELSA-2016-1486.html (Links to External Site)
Cause:   State error
Underlying OS:  Linux (Oracle)
Underlying OS Comments:  7

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:  [El-errata] ELSA-2016-1486 Moderate: Oracle Linux 7 samba security and bug fix update

Oracle Linux Security Advisory ELSA-2016-1486

http://linux.oracle.com/errata/ELSA-2016-1486.html

The following updated rpms for Oracle Linux 7 have been uploaded to the 
Unbreakable Linux Network:

x86_64:
libsmbclient-4.2.10-7.el7_2.i686.rpm
libsmbclient-4.2.10-7.el7_2.x86_64.rpm
libsmbclient-devel-4.2.10-7.el7_2.i686.rpm
libsmbclient-devel-4.2.10-7.el7_2.x86_64.rpm
libwbclient-4.2.10-7.el7_2.i686.rpm
libwbclient-4.2.10-7.el7_2.x86_64.rpm
libwbclient-devel-4.2.10-7.el7_2.i686.rpm
libwbclient-devel-4.2.10-7.el7_2.x86_64.rpm
samba-4.2.10-7.el7_2.x86_64.rpm
samba-client-4.2.10-7.el7_2.x86_64.rpm
samba-client-libs-4.2.10-7.el7_2.i686.rpm
samba-client-libs-4.2.10-7.el7_2.x86_64.rpm
samba-common-4.2.10-7.el7_2.noarch.rpm
samba-common-libs-4.2.10-7.el7_2.x86_64.rpm
samba-common-tools-4.2.10-7.el7_2.x86_64.rpm
samba-dc-4.2.10-7.el7_2.x86_64.rpm
samba-dc-libs-4.2.10-7.el7_2.x86_64.rpm
samba-devel-4.2.10-7.el7_2.i686.rpm
samba-devel-4.2.10-7.el7_2.x86_64.rpm
samba-libs-4.2.10-7.el7_2.i686.rpm
samba-libs-4.2.10-7.el7_2.x86_64.rpm
samba-pidl-4.2.10-7.el7_2.noarch.rpm
samba-python-4.2.10-7.el7_2.x86_64.rpm
samba-test-4.2.10-7.el7_2.x86_64.rpm
samba-test-devel-4.2.10-7.el7_2.x86_64.rpm
samba-test-libs-4.2.10-7.el7_2.i686.rpm
samba-test-libs-4.2.10-7.el7_2.x86_64.rpm
samba-vfs-glusterfs-4.2.10-7.el7_2.x86_64.rpm
samba-winbind-4.2.10-7.el7_2.x86_64.rpm
samba-winbind-clients-4.2.10-7.el7_2.x86_64.rpm
samba-winbind-krb5-locator-4.2.10-7.el7_2.x86_64.rpm
samba-winbind-modules-4.2.10-7.el7_2.i686.rpm
samba-winbind-modules-4.2.10-7.el7_2.x86_64.rpm
ctdb-4.2.10-7.el7_2.x86_64.rpm
ctdb-tests-4.2.10-7.el7_2.x86_64.rpm
ctdb-devel-4.2.10-7.el7_2.x86_64.rpm
ctdb-devel-4.2.10-7.el7_2.i686.rpm


SRPMS:
http://oss.oracle.com/ol7/SRPMS-updates/samba-4.2.10-7.el7_2.src.rpm



Description of changes:

[4.2.10-7]
- resolves: #1351960 - Fix CVE-2016-2119

[4.2.10-6.3]
- resolves: #1350759 - Fix idmap_hash when used with other modules
- resolves: #1351260 - Fix krb5 encryption type setup during join


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