ESB-2018.3683 - [UNIX/Linux][Ubuntu] samba: Denial of service - Existing account 2018-11-28

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===========================================================================
             AUSCERT External Security Bulletin Redistribution

                               ESB-2018.3683
                           Samba vulnerabilities
                             28 November 2018

===========================================================================

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           samba
Publisher:         Ubuntu
Operating System:  Ubuntu
                   UNIX variants (UNIX, Linux, OSX)
Impact/Access:     Denial of Service -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-16851 CVE-2018-16841 CVE-2018-14629

Original Bulletin: 
   http://www.ubuntu.com/usn/usn-3827-1
   http://www.ubuntu.com/usn/usn-3827-2

Comment: This advisory references vulnerabilities in products which run on 
         platforms other than Ubuntu. It is recommended that administrators 
         running samba check for an updated version of the software for their
         operating system.
         
         This bulletin contains two (2) Ubuntu security advisories.

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==========================================================================
Ubuntu Security Notice USN-3827-1
November 27, 2018

samba vulnerabilities
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- - Ubuntu 18.10
- - Ubuntu 18.04 LTS
- - Ubuntu 16.04 LTS
- - Ubuntu 14.04 LTS

Summary:

Several security issues were fixed in Samba.

Software Description:
- - samba: SMB/CIFS file, print, and login server for Unix

Details:

Florian Stuelpner discovered that Samba incorrectly handled CNAME records.
A remote attacker could use this issue to cause Samba to crash, resulting
in a denial of service. (CVE-2018-14629)

Alex MacCuish discovered that Samba incorrectly handled memory when
configured to accept smart-card authentication. A remote attacker could
possibly use this issue to cause Samba to crash, resulting in a denial of
service. (CVE-2018-16841)

Garming Sam discovered that Samba incorrectly handled memory when
processing LDAP searches. A remote attacker could possibly use this issue
to cause Samba to crash, resulting in a denial of service. (CVE-2018-16851)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 18.10:
  samba                           2:4.8.4+dfsg-2ubuntu2.1

Ubuntu 18.04 LTS:
  samba                           2:4.7.6+dfsg~ubuntu-0ubuntu2.5

Ubuntu 16.04 LTS:
  samba                           2:4.3.11+dfsg-0ubuntu0.16.04.18

Ubuntu 14.04 LTS:
  samba                           2:4.3.11+dfsg-0ubuntu0.14.04.19

In general, a standard system update will make all the necessary changes.

References:
  https://usn.ubuntu.com/usn/usn-3827-1
  CVE-2018-14629, CVE-2018-16841, CVE-2018-16851

Package Information:
  https://launchpad.net/ubuntu/+source/samba/2:4.8.4+dfsg-2ubuntu2.1
  https://launchpad.net/ubuntu/+source/samba/2:4.7.6+dfsg~ubuntu-0ubuntu2.5
  https://launchpad.net/ubuntu/+source/samba/2:4.3.11+dfsg-0ubuntu0.16.04.18
  https://launchpad.net/ubuntu/+source/samba/2:4.3.11+dfsg-0ubuntu0.14.04.19

==========================================================================
Ubuntu Security Notice USN-3827-2
November 27, 2018

samba vulnerabilities
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- - Ubuntu 12.04 ESM

Summary:

Several security issues were fixed in Samba.

Software Description:
- - samba: SMB/CIFS file, print, and login server for Unix

Details:

USN-3827-1 fixed a vulnerability in samba. This update provides
the corresponding update for Ubuntu 12.04 ESM.


Original advisory details:

Florian Stuelpner discovered that Samba incorrectly handled CNAME records. A
remote attacker could use this issue to cause Samba to crash, resulting in a
denial of service. (CVE-2018-14629)

Alex MacCuish discovered that Samba incorrectly handled memory when configured
to accept smart-card authentication. A remote attacker could possibly use this
issue to cause Samba to crash, resulting in a denial of service.
(CVE-2018-16841)

Garming Sam discovered that Samba incorrectly handled memory when processing
LDAP searches. A remote attacker could possibly use this issue to cause Samba
to crash, resulting in a denial of service. (CVE-2018-16851)

Update instructions

The problem can be corrected by updating your system to the following package
versions:

Ubuntu 12.04 ESM
    samba - 2:3.6.25-0ubuntu0.12.04.16

To update your system, please follow these instructions: https://
wiki.ubuntu.com/Security/Upgrades.

In general, a standard system update will make all the necessary changes.

References

  o USN-3827-1
  o CVE-2018-14629
  o CVE-2018-16841
  o CVE-2018-16851

(C) 2017 Canonical Ltd. Ubuntu and Canonical are registered trademarks of
Canonical Ltd.

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