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Category:   Application (File Transfer/Sharing)  >   Samba Vendors:   Samba.org
(Red Hat Issues Fix) Samba Lets Remote Authenticated Users Cause the Target 'winbindd' Service to Crash
SecurityTracker Alert ID:  1038080
SecurityTracker URL:  http://securitytracker.com/id/1038080
CVE Reference:   CVE-2016-2126   (Links to External Site)
Date:  Mar 21 2017
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 4.0.0 - 4.5.2
Description:   A vulnerability was reported in Samba. A remote authenticated user can cause the target service to crash.

A remote authenticated user can send a specially crafted Privilege Attribute Certificate (PAC) to trigger an overflow and cause the target winbindd service to crash.

Volker Lendecke reported this vulnerability.

Impact:   A remote authenticated user can cause the target service to crash.
Solution:   Red Hat has issued a fix for samba4.

The Red Hat advisory is available at:

https://rhn.redhat.com/errata/RHSA-2017-0744.html

Vendor URL:  rhn.redhat.com/errata/RHSA-2017-0744.html (Links to External Site)
Cause:   Boundary 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.
Dec 19 2016 Samba Lets Remote Authenticated Users Cause the Target 'winbindd' Service to Crash



 Source Message Contents

Subject:  [RHSA-2017:0744-01] Moderate: samba4 security and bug fix update

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

Synopsis:          Moderate: samba4 security and bug fix update
Advisory ID:       RHSA-2017:0744-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2017-0744.html
Issue date:        2017-03-21
CVE Names:         CVE-2016-2125 CVE-2016-2126 
=====================================================================

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 always requested forwardable tickets when using
Kerberos authentication. A service to which Samba authenticated using
Kerberos could subsequently use the ticket to impersonate Samba to other
services or domain users. (CVE-2016-2125)

* A flaw was found in the way Samba handled PAC (Privilege Attribute
Certificate) checksums. A remote, authenticated attacker could use this
flaw to crash the winbindd process. (CVE-2016-2126)

Additional Changes:

For detailed information on changes in this release, see the Red Hat
Enterprise Linux 6.9 Release Notes and Red Hat Enterprise Linux 6.9
Technical Notes linked from the References section.

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/):

1403114 - CVE-2016-2125 samba: Unconditional privilege delegation to Kerberos servers in trusted realms
1403115 - CVE-2016-2126 samba: Flaws in Kerberos PAC validation can trigger privilege elevation

6. Package List:

Red Hat Enterprise Linux Desktop (v. 6):

Source:
samba4-4.2.10-9.el6.src.rpm

i386:
samba4-4.2.10-9.el6.i686.rpm
samba4-client-4.2.10-9.el6.i686.rpm
samba4-common-4.2.10-9.el6.i686.rpm
samba4-dc-4.2.10-9.el6.i686.rpm
samba4-dc-libs-4.2.10-9.el6.i686.rpm
samba4-debuginfo-4.2.10-9.el6.i686.rpm
samba4-devel-4.2.10-9.el6.i686.rpm
samba4-libs-4.2.10-9.el6.i686.rpm
samba4-pidl-4.2.10-9.el6.i686.rpm
samba4-python-4.2.10-9.el6.i686.rpm
samba4-test-4.2.10-9.el6.i686.rpm
samba4-winbind-4.2.10-9.el6.i686.rpm
samba4-winbind-clients-4.2.10-9.el6.i686.rpm
samba4-winbind-krb5-locator-4.2.10-9.el6.i686.rpm

x86_64:
samba4-4.2.10-9.el6.x86_64.rpm
samba4-client-4.2.10-9.el6.x86_64.rpm
samba4-common-4.2.10-9.el6.x86_64.rpm
samba4-dc-4.2.10-9.el6.x86_64.rpm
samba4-dc-libs-4.2.10-9.el6.x86_64.rpm
samba4-debuginfo-4.2.10-9.el6.x86_64.rpm
samba4-devel-4.2.10-9.el6.x86_64.rpm
samba4-libs-4.2.10-9.el6.x86_64.rpm
samba4-pidl-4.2.10-9.el6.x86_64.rpm
samba4-python-4.2.10-9.el6.x86_64.rpm
samba4-test-4.2.10-9.el6.x86_64.rpm
samba4-winbind-4.2.10-9.el6.x86_64.rpm
samba4-winbind-clients-4.2.10-9.el6.x86_64.rpm
samba4-winbind-krb5-locator-4.2.10-9.el6.x86_64.rpm

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

Source:
samba4-4.2.10-9.el6.src.rpm

x86_64:
samba4-4.2.10-9.el6.x86_64.rpm
samba4-client-4.2.10-9.el6.x86_64.rpm
samba4-common-4.2.10-9.el6.x86_64.rpm
samba4-dc-4.2.10-9.el6.x86_64.rpm
samba4-dc-libs-4.2.10-9.el6.x86_64.rpm
samba4-debuginfo-4.2.10-9.el6.x86_64.rpm
samba4-devel-4.2.10-9.el6.x86_64.rpm
samba4-libs-4.2.10-9.el6.x86_64.rpm
samba4-pidl-4.2.10-9.el6.x86_64.rpm
samba4-python-4.2.10-9.el6.x86_64.rpm
samba4-test-4.2.10-9.el6.x86_64.rpm
samba4-winbind-4.2.10-9.el6.x86_64.rpm
samba4-winbind-clients-4.2.10-9.el6.x86_64.rpm
samba4-winbind-krb5-locator-4.2.10-9.el6.x86_64.rpm

Red Hat Enterprise Linux Server (v. 6):

Source:
samba4-4.2.10-9.el6.src.rpm

i386:
samba4-4.2.10-9.el6.i686.rpm
samba4-client-4.2.10-9.el6.i686.rpm
samba4-common-4.2.10-9.el6.i686.rpm
samba4-dc-4.2.10-9.el6.i686.rpm
samba4-dc-libs-4.2.10-9.el6.i686.rpm
samba4-debuginfo-4.2.10-9.el6.i686.rpm
samba4-devel-4.2.10-9.el6.i686.rpm
samba4-libs-4.2.10-9.el6.i686.rpm
samba4-pidl-4.2.10-9.el6.i686.rpm
samba4-python-4.2.10-9.el6.i686.rpm
samba4-test-4.2.10-9.el6.i686.rpm
samba4-winbind-4.2.10-9.el6.i686.rpm
samba4-winbind-clients-4.2.10-9.el6.i686.rpm
samba4-winbind-krb5-locator-4.2.10-9.el6.i686.rpm

ppc64:
samba4-4.2.10-9.el6.ppc64.rpm
samba4-client-4.2.10-9.el6.ppc64.rpm
samba4-common-4.2.10-9.el6.ppc64.rpm
samba4-dc-4.2.10-9.el6.ppc64.rpm
samba4-dc-libs-4.2.10-9.el6.ppc64.rpm
samba4-debuginfo-4.2.10-9.el6.ppc64.rpm
samba4-devel-4.2.10-9.el6.ppc64.rpm
samba4-libs-4.2.10-9.el6.ppc64.rpm
samba4-pidl-4.2.10-9.el6.ppc64.rpm
samba4-python-4.2.10-9.el6.ppc64.rpm
samba4-test-4.2.10-9.el6.ppc64.rpm
samba4-winbind-4.2.10-9.el6.ppc64.rpm
samba4-winbind-clients-4.2.10-9.el6.ppc64.rpm
samba4-winbind-krb5-locator-4.2.10-9.el6.ppc64.rpm

s390x:
samba4-4.2.10-9.el6.s390x.rpm
samba4-client-4.2.10-9.el6.s390x.rpm
samba4-common-4.2.10-9.el6.s390x.rpm
samba4-dc-4.2.10-9.el6.s390x.rpm
samba4-dc-libs-4.2.10-9.el6.s390x.rpm
samba4-debuginfo-4.2.10-9.el6.s390x.rpm
samba4-devel-4.2.10-9.el6.s390x.rpm
samba4-libs-4.2.10-9.el6.s390x.rpm
samba4-pidl-4.2.10-9.el6.s390x.rpm
samba4-python-4.2.10-9.el6.s390x.rpm
samba4-test-4.2.10-9.el6.s390x.rpm
samba4-winbind-4.2.10-9.el6.s390x.rpm
samba4-winbind-clients-4.2.10-9.el6.s390x.rpm
samba4-winbind-krb5-locator-4.2.10-9.el6.s390x.rpm

x86_64:
samba4-4.2.10-9.el6.x86_64.rpm
samba4-client-4.2.10-9.el6.x86_64.rpm
samba4-common-4.2.10-9.el6.x86_64.rpm
samba4-dc-4.2.10-9.el6.x86_64.rpm
samba4-dc-libs-4.2.10-9.el6.x86_64.rpm
samba4-debuginfo-4.2.10-9.el6.x86_64.rpm
samba4-devel-4.2.10-9.el6.x86_64.rpm
samba4-libs-4.2.10-9.el6.x86_64.rpm
samba4-pidl-4.2.10-9.el6.x86_64.rpm
samba4-python-4.2.10-9.el6.x86_64.rpm
samba4-test-4.2.10-9.el6.x86_64.rpm
samba4-winbind-4.2.10-9.el6.x86_64.rpm
samba4-winbind-clients-4.2.10-9.el6.x86_64.rpm
samba4-winbind-krb5-locator-4.2.10-9.el6.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 6):

Source:
samba4-4.2.10-9.el6.src.rpm

i386:
samba4-4.2.10-9.el6.i686.rpm
samba4-client-4.2.10-9.el6.i686.rpm
samba4-common-4.2.10-9.el6.i686.rpm
samba4-dc-4.2.10-9.el6.i686.rpm
samba4-dc-libs-4.2.10-9.el6.i686.rpm
samba4-debuginfo-4.2.10-9.el6.i686.rpm
samba4-devel-4.2.10-9.el6.i686.rpm
samba4-libs-4.2.10-9.el6.i686.rpm
samba4-pidl-4.2.10-9.el6.i686.rpm
samba4-python-4.2.10-9.el6.i686.rpm
samba4-test-4.2.10-9.el6.i686.rpm
samba4-winbind-4.2.10-9.el6.i686.rpm
samba4-winbind-clients-4.2.10-9.el6.i686.rpm
samba4-winbind-krb5-locator-4.2.10-9.el6.i686.rpm

x86_64:
samba4-4.2.10-9.el6.x86_64.rpm
samba4-client-4.2.10-9.el6.x86_64.rpm
samba4-common-4.2.10-9.el6.x86_64.rpm
samba4-dc-4.2.10-9.el6.x86_64.rpm
samba4-dc-libs-4.2.10-9.el6.x86_64.rpm
samba4-debuginfo-4.2.10-9.el6.x86_64.rpm
samba4-devel-4.2.10-9.el6.x86_64.rpm
samba4-libs-4.2.10-9.el6.x86_64.rpm
samba4-pidl-4.2.10-9.el6.x86_64.rpm
samba4-python-4.2.10-9.el6.x86_64.rpm
samba4-test-4.2.10-9.el6.x86_64.rpm
samba4-winbind-4.2.10-9.el6.x86_64.rpm
samba4-winbind-clients-4.2.10-9.el6.x86_64.rpm
samba4-winbind-krb5-locator-4.2.10-9.el6.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-2016-2125
https://access.redhat.com/security/cve/CVE-2016-2126
https://access.redhat.com/security/updates/classification/#moderate
https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/6/html/6.9_Release_Notes/index.html
https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/6/html/6.9_Technical_Notes/index.html
https://www.samba.org/samba/security/CVE-2016-2125.html
https://www.samba.org/samba/security/CVE-2016-2126.html

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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