Bug 1311903 (CVE-2016-2112) - CVE-2016-2112 samba: Missing downgrade detection
Summary: CVE-2016-2112 samba: Missing downgrade detection
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2016-2112
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1322684 1322685 1322686 1322687 1322688 1322689 1322690 1322691 1322692 1324800 1324801 1324802 1324803 1324804 1324805 1324806 1324807 1325382 1325383 1325384 1325385 1325645 1325649 1325650 1325651 1325832 1325838 1326453
Blocks: 1311915
TreeView+ depends on / blocked
 
Reported: 2016-02-25 10:00 UTC by Adam Mariš
Modified: 2021-02-17 04:17 UTC (History)
15 users (show)

Fixed In Version: samba 4.4.1, samba 4.3.7, samba 4.2.10
Clone Of:
Environment:
Last Closed: 2016-04-19 05:28:39 UTC
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2016:0611 0 normal SHIPPED_LIVE Critical: samba security update 2016-04-13 11:04:02 UTC
Red Hat Product Errata RHSA-2016:0612 0 normal SHIPPED_LIVE Critical: samba and samba4 security, bug fix, and enhancement update 2016-04-13 05:06:20 UTC
Red Hat Product Errata RHSA-2016:0613 0 normal SHIPPED_LIVE Critical: samba3x security update 2016-04-12 21:37:46 UTC
Red Hat Product Errata RHSA-2016:0614 0 normal SHIPPED_LIVE Critical: samba security, bug fix, and enhancement update 2016-04-13 01:38:55 UTC
Red Hat Product Errata RHSA-2016:0618 0 normal SHIPPED_LIVE Critical: samba security, bug fix, and enhancement update 2016-04-13 05:25:52 UTC
Red Hat Product Errata RHSA-2016:0619 0 normal SHIPPED_LIVE Critical: samba security update 2016-04-12 23:33:20 UTC
Red Hat Product Errata RHSA-2016:0620 0 normal SHIPPED_LIVE Critical: samba4 security, bug fix, and enhancement update 2016-04-13 01:20:34 UTC
Red Hat Product Errata RHSA-2016:0624 0 normal SHIPPED_LIVE Critical: samba3x security update 2016-04-12 23:15:40 UTC

Description Adam Mariš 2016-02-25 10:00:58 UTC 
It was found that one of the LDAP client libraries in Samba, mostly used by administration tools for an active directory domain controller, doesn't have any downgrade detection. A man in the middle is able to downgrade the connection to no integrity/privacy protection and take over the connection. In addition using no protection is the default for some tools. While there's already an smb.conf option called "client ldap sasl wrapping", which defaults to "sign".

Currently all Samba versions >= 4.0.0 are affected.

Upstream bug:

https://bugzilla.samba.org/show_bug.cgi?id=11644
Comment 6 Huzaifa S. Sidhpurwala 2016-04-11 05:32:56 UTC 
Acknowledgements:

Name: the Samba project
Upstream: Stefan Metzmacher (SerNet)
Comment 7 Huzaifa S. Sidhpurwala 2016-04-11 05:45:10 UTC 
External Reference:

https://access.redhat.com/articles/2243351
Comment 10 Huzaifa S. Sidhpurwala 2016-04-12 17:10:59 UTC 
Public via:

https://www.samba.org/samba/security/CVE-2016-2112.html
Comment 11 Siddharth Sharma 2016-04-12 17:28:27 UTC 
Created samba tracking bugs for this issue:

Affects: fedora-all [bug 1326453]
Comment 12 errata-xmlrpc 2016-04-12 17:34:20 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 6

Via RHSA-2016:0611 https://rhn.redhat.com/errata/RHSA-2016-0611.html
Comment 13 errata-xmlrpc 2016-04-12 17:39:09 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 5

Via RHSA-2016:0613 https://rhn.redhat.com/errata/RHSA-2016-0613.html
Comment 14 errata-xmlrpc 2016-04-12 17:40:05 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 5

Via RHSA-2016:0621 https://rhn.redhat.com/errata/RHSA-2016-0621.html
Comment 15 errata-xmlrpc 2016-04-12 19:16:46 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 5.6 Long Life
  Red Hat Enterprise Linux 5.9 Long Life

Via RHSA-2016:0624 https://rhn.redhat.com/errata/RHSA-2016-0624.html
Comment 16 errata-xmlrpc 2016-04-12 19:18:08 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 5.6 Long Life
  Red Hat Enterprise Linux 5.9 Long Life

Via RHSA-2016:0623 https://rhn.redhat.com/errata/RHSA-2016-0623.html
Comment 17 errata-xmlrpc 2016-04-12 19:34:04 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 6.4 Advanced Update Support
  Red Hat Enterprise Linux 6.2 Advanced Update Support
  Red Hat Enterprise Linux 6.6 Extended Update Support
  Red Hat Enterprise Linux 6.5 Advanced Update Support

Via RHSA-2016:0619 https://rhn.redhat.com/errata/RHSA-2016-0619.html
Comment 18 errata-xmlrpc 2016-04-12 21:21:21 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 4 Extended Lifecycle Support

Via RHSA-2016:0625 https://rhn.redhat.com/errata/RHSA-2016-0625.html
Comment 19 errata-xmlrpc 2016-04-12 21:24:37 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 6.6 Extended Update Support
  Red Hat Enterprise Linux 6.5 Advanced Update Support
  Red Hat Enterprise Linux 6.4 Advanced Update Support
  Red Hat Enterprise Linux 6.2 Advanced Update Support

Via RHSA-2016:0620 https://rhn.redhat.com/errata/RHSA-2016-0620.html
Comment 20 errata-xmlrpc 2016-04-12 21:39:42 UTC 
This issue has been addressed in the following products:

  Red Hat Gluster Storage 3.1 for RHEL 7
  Red Hat Gluster Storage 3.1 for RHEL 6

Via RHSA-2016:0614 https://rhn.redhat.com/errata/RHSA-2016-0614.html
Comment 21 errata-xmlrpc 2016-04-13 01:07:21 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7
  Red Hat Enterprise Linux 6

Via RHSA-2016:0612 https://rhn.redhat.com/errata/RHSA-2016-0612.html
Comment 22 errata-xmlrpc 2016-04-13 01:27:10 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7.1 Extended Update Support

Via RHSA-2016:0618 https://rhn.redhat.com/errata/RHSA-2016-0618.html
Comment 23 Fedora Update System 2016-04-13 20:21:26 UTC 
samba-4.3.8-0.fc23 has been pushed to the Fedora 23 stable repository. If problems still persist, please make note of it in this bug report.
Comment 24 Fedora Update System 2016-04-14 04:21:11 UTC 
samba-4.2.11-0.fc22 has been pushed to the Fedora 22 stable repository. If problems still persist, please make note of it in this bug report.
Comment 28 Fedora Update System 2016-04-15 03:16:57 UTC 
samba-4.4.2-1.fc24 has been pushed to the Fedora 24 stable repository. If problems still persist, please make note of it in this bug report.
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