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Category:   Application (File Transfer/Sharing)  >   Samba Vendors:   Samba.org
(Red Hat Issues Fix) Samba Multiple Flaws Let Remote Users Hijack Connections and Remote Authenticated Users Obtain Potentially Sensitive Information
SecurityTracker Alert ID:  1039421
SecurityTracker URL:  http://securitytracker.com/id/1039421
CVE Reference:   CVE-2017-12150, CVE-2017-12163   (Links to External Site)
Date:  Sep 21 2017
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): prior to versions 4.4.16, 4.5.14, and 4.6.8
Description:   Several vulnerabilities were reported in Samba. A remote user can access data on the target system. A remote user can modify data on the target system. A remote authenticated user can obtain potentially sensitive information on the target system.

The system fails to require SMB signing in certain cases. A remote user can conduct a man-in-the-middle attack to hijack client connections and obtain potentially sensitive information [CVE-2017-12150]. Versions 3.0.25 to 4.6.7 are affected.

The client software does not properly sign and encrypt DFS redirects when the max protocol for the original connection is set as 'SMB3' [CVE-2017-12151]. Versions 4.1.0 to 4.6.7 are affected.

A remote authenticated user can send specially crafted SMB1 data to cause portions of server memory contents to be written to a file on the target Samba share or to a shared printer [CVE-2017-12163].

Yihan Lian and Zhibin Hu, security researchers with Qihoo 360 GearTeam, and Stefan Metzmacher of SerNet (https://samba.plus) reported these vulnerabilities.

Impact:   A remote user can access and modify data communicated between the client and server.

A remote authenticated user can obtain potentially sensitive information from server memory on the target system.

Solution:   Red Hat has issued a fix for CVE-2017-12150 and CVE-2017-12163.

The Red Hat advisory is available at:

https://access.redhat.com/errata/RHSA-2017:2791

Vendor URL:  access.redhat.com/errata/RHSA-2017:2791 (Links to External Site)
Cause:   Access control error, Authentication 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.
Sep 21 2017 Samba Multiple Flaws Let Remote Users Hijack Connections and Remote Authenticated Users Obtain Potentially Sensitive Information



 Source Message Contents

Subject:  [RHSA-2017:2791-01] Moderate: samba4 security update

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

=====================================================================
                   Red Hat Security Advisory

Synopsis:          Moderate: samba4 security update
Advisory ID:       RHSA-2017:2791-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2017:2791
Issue date:        2017-09-21
CVE Names:         CVE-2017-12150 CVE-2017-12163 
=====================================================================

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):

* It was found that samba did not enforce "SMB signing" when certain
configuration options were enabled. A remote attacker could launch a
man-in-the-middle attack and retrieve information in plain-text.
(CVE-2017-12150)

* An information leak flaw was found in the way SMB1 protocol was
implemented by Samba. A malicious client could use this flaw to dump server
memory contents to a file on the samba share or to a shared printer, though
the exact area of server memory cannot be controlled by the attacker.
(CVE-2017-12163)

Red Hat would like to thank the Samba project for reporting CVE-2017-12150
and Yihan Lian and Zhibin Hu (Qihoo 360 GearTeam), Stefan Metzmacher
(SerNet), and Jeremy Allison (Google) for reporting CVE-2017-12163.
Upstream acknowledges Stefan Metzmacher (SerNet) as the original reporter
of CVE-2017-12150.

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/):

1488400 - CVE-2017-12150 samba: Some code path don't enforce smb signing, when they should
1491206 - CVE-2017-12163 Samba: Server memory information leak over SMB1

6. Package List:

Red Hat Enterprise Linux Desktop (v. 6):

Source:
samba4-4.2.10-11.el6_9.src.rpm

i386:
samba4-4.2.10-11.el6_9.i686.rpm
samba4-client-4.2.10-11.el6_9.i686.rpm
samba4-common-4.2.10-11.el6_9.i686.rpm
samba4-dc-4.2.10-11.el6_9.i686.rpm
samba4-dc-libs-4.2.10-11.el6_9.i686.rpm
samba4-debuginfo-4.2.10-11.el6_9.i686.rpm
samba4-devel-4.2.10-11.el6_9.i686.rpm
samba4-libs-4.2.10-11.el6_9.i686.rpm
samba4-pidl-4.2.10-11.el6_9.i686.rpm
samba4-python-4.2.10-11.el6_9.i686.rpm
samba4-test-4.2.10-11.el6_9.i686.rpm
samba4-winbind-4.2.10-11.el6_9.i686.rpm
samba4-winbind-clients-4.2.10-11.el6_9.i686.rpm
samba4-winbind-krb5-locator-4.2.10-11.el6_9.i686.rpm

x86_64:
samba4-4.2.10-11.el6_9.x86_64.rpm
samba4-client-4.2.10-11.el6_9.x86_64.rpm
samba4-common-4.2.10-11.el6_9.x86_64.rpm
samba4-dc-4.2.10-11.el6_9.x86_64.rpm
samba4-dc-libs-4.2.10-11.el6_9.x86_64.rpm
samba4-debuginfo-4.2.10-11.el6_9.x86_64.rpm
samba4-devel-4.2.10-11.el6_9.x86_64.rpm
samba4-libs-4.2.10-11.el6_9.x86_64.rpm
samba4-pidl-4.2.10-11.el6_9.x86_64.rpm
samba4-python-4.2.10-11.el6_9.x86_64.rpm
samba4-test-4.2.10-11.el6_9.x86_64.rpm
samba4-winbind-4.2.10-11.el6_9.x86_64.rpm
samba4-winbind-clients-4.2.10-11.el6_9.x86_64.rpm
samba4-winbind-krb5-locator-4.2.10-11.el6_9.x86_64.rpm

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

Source:
samba4-4.2.10-11.el6_9.src.rpm

x86_64:
samba4-4.2.10-11.el6_9.x86_64.rpm
samba4-client-4.2.10-11.el6_9.x86_64.rpm
samba4-common-4.2.10-11.el6_9.x86_64.rpm
samba4-dc-4.2.10-11.el6_9.x86_64.rpm
samba4-dc-libs-4.2.10-11.el6_9.x86_64.rpm
samba4-debuginfo-4.2.10-11.el6_9.x86_64.rpm
samba4-devel-4.2.10-11.el6_9.x86_64.rpm
samba4-libs-4.2.10-11.el6_9.x86_64.rpm
samba4-pidl-4.2.10-11.el6_9.x86_64.rpm
samba4-python-4.2.10-11.el6_9.x86_64.rpm
samba4-test-4.2.10-11.el6_9.x86_64.rpm
samba4-winbind-4.2.10-11.el6_9.x86_64.rpm
samba4-winbind-clients-4.2.10-11.el6_9.x86_64.rpm
samba4-winbind-krb5-locator-4.2.10-11.el6_9.x86_64.rpm

Red Hat Enterprise Linux Server (v. 6):

Source:
samba4-4.2.10-11.el6_9.src.rpm

i386:
samba4-4.2.10-11.el6_9.i686.rpm
samba4-client-4.2.10-11.el6_9.i686.rpm
samba4-common-4.2.10-11.el6_9.i686.rpm
samba4-dc-4.2.10-11.el6_9.i686.rpm
samba4-dc-libs-4.2.10-11.el6_9.i686.rpm
samba4-debuginfo-4.2.10-11.el6_9.i686.rpm
samba4-devel-4.2.10-11.el6_9.i686.rpm
samba4-libs-4.2.10-11.el6_9.i686.rpm
samba4-pidl-4.2.10-11.el6_9.i686.rpm
samba4-python-4.2.10-11.el6_9.i686.rpm
samba4-test-4.2.10-11.el6_9.i686.rpm
samba4-winbind-4.2.10-11.el6_9.i686.rpm
samba4-winbind-clients-4.2.10-11.el6_9.i686.rpm
samba4-winbind-krb5-locator-4.2.10-11.el6_9.i686.rpm

ppc64:
samba4-4.2.10-11.el6_9.ppc64.rpm
samba4-client-4.2.10-11.el6_9.ppc64.rpm
samba4-common-4.2.10-11.el6_9.ppc64.rpm
samba4-dc-4.2.10-11.el6_9.ppc64.rpm
samba4-dc-libs-4.2.10-11.el6_9.ppc64.rpm
samba4-debuginfo-4.2.10-11.el6_9.ppc64.rpm
samba4-devel-4.2.10-11.el6_9.ppc64.rpm
samba4-libs-4.2.10-11.el6_9.ppc64.rpm
samba4-pidl-4.2.10-11.el6_9.ppc64.rpm
samba4-python-4.2.10-11.el6_9.ppc64.rpm
samba4-test-4.2.10-11.el6_9.ppc64.rpm
samba4-winbind-4.2.10-11.el6_9.ppc64.rpm
samba4-winbind-clients-4.2.10-11.el6_9.ppc64.rpm
samba4-winbind-krb5-locator-4.2.10-11.el6_9.ppc64.rpm

s390x:
samba4-4.2.10-11.el6_9.s390x.rpm
samba4-client-4.2.10-11.el6_9.s390x.rpm
samba4-common-4.2.10-11.el6_9.s390x.rpm
samba4-dc-4.2.10-11.el6_9.s390x.rpm
samba4-dc-libs-4.2.10-11.el6_9.s390x.rpm
samba4-debuginfo-4.2.10-11.el6_9.s390x.rpm
samba4-devel-4.2.10-11.el6_9.s390x.rpm
samba4-libs-4.2.10-11.el6_9.s390x.rpm
samba4-pidl-4.2.10-11.el6_9.s390x.rpm
samba4-python-4.2.10-11.el6_9.s390x.rpm
samba4-test-4.2.10-11.el6_9.s390x.rpm
samba4-winbind-4.2.10-11.el6_9.s390x.rpm
samba4-winbind-clients-4.2.10-11.el6_9.s390x.rpm
samba4-winbind-krb5-locator-4.2.10-11.el6_9.s390x.rpm

x86_64:
samba4-4.2.10-11.el6_9.x86_64.rpm
samba4-client-4.2.10-11.el6_9.x86_64.rpm
samba4-common-4.2.10-11.el6_9.x86_64.rpm
samba4-dc-4.2.10-11.el6_9.x86_64.rpm
samba4-dc-libs-4.2.10-11.el6_9.x86_64.rpm
samba4-debuginfo-4.2.10-11.el6_9.x86_64.rpm
samba4-devel-4.2.10-11.el6_9.x86_64.rpm
samba4-libs-4.2.10-11.el6_9.x86_64.rpm
samba4-pidl-4.2.10-11.el6_9.x86_64.rpm
samba4-python-4.2.10-11.el6_9.x86_64.rpm
samba4-test-4.2.10-11.el6_9.x86_64.rpm
samba4-winbind-4.2.10-11.el6_9.x86_64.rpm
samba4-winbind-clients-4.2.10-11.el6_9.x86_64.rpm
samba4-winbind-krb5-locator-4.2.10-11.el6_9.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 6):

Source:
samba4-4.2.10-11.el6_9.src.rpm

i386:
samba4-4.2.10-11.el6_9.i686.rpm
samba4-client-4.2.10-11.el6_9.i686.rpm
samba4-common-4.2.10-11.el6_9.i686.rpm
samba4-dc-4.2.10-11.el6_9.i686.rpm
samba4-dc-libs-4.2.10-11.el6_9.i686.rpm
samba4-debuginfo-4.2.10-11.el6_9.i686.rpm
samba4-devel-4.2.10-11.el6_9.i686.rpm
samba4-libs-4.2.10-11.el6_9.i686.rpm
samba4-pidl-4.2.10-11.el6_9.i686.rpm
samba4-python-4.2.10-11.el6_9.i686.rpm
samba4-test-4.2.10-11.el6_9.i686.rpm
samba4-winbind-4.2.10-11.el6_9.i686.rpm
samba4-winbind-clients-4.2.10-11.el6_9.i686.rpm
samba4-winbind-krb5-locator-4.2.10-11.el6_9.i686.rpm

x86_64:
samba4-4.2.10-11.el6_9.x86_64.rpm
samba4-client-4.2.10-11.el6_9.x86_64.rpm
samba4-common-4.2.10-11.el6_9.x86_64.rpm
samba4-dc-4.2.10-11.el6_9.x86_64.rpm
samba4-dc-libs-4.2.10-11.el6_9.x86_64.rpm
samba4-debuginfo-4.2.10-11.el6_9.x86_64.rpm
samba4-devel-4.2.10-11.el6_9.x86_64.rpm
samba4-libs-4.2.10-11.el6_9.x86_64.rpm
samba4-pidl-4.2.10-11.el6_9.x86_64.rpm
samba4-python-4.2.10-11.el6_9.x86_64.rpm
samba4-test-4.2.10-11.el6_9.x86_64.rpm
samba4-winbind-4.2.10-11.el6_9.x86_64.rpm
samba4-winbind-clients-4.2.10-11.el6_9.x86_64.rpm
samba4-winbind-krb5-locator-4.2.10-11.el6_9.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-2017-12150
https://access.redhat.com/security/cve/CVE-2017-12163
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 2017 Red Hat, Inc.
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