ESB-2018.0230 - [Ubuntu] openssh-server: Multiple vulnerabilities 2018-01-23

Printable version
PGP/GPG verifiable version

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

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

                               ESB-2018.0230
                          OpenSSH vulnerabilities
                              23 January 2018

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

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

Product:           openssh-server
Publisher:         Ubuntu
Operating System:  Ubuntu
Impact/Access:     Root Compromise        -- Existing Account      
                   Access Privileged Data -- Existing Account      
                   Create Arbitrary Files -- Remote/Unauthenticated
                   Modify Arbitrary Files -- Existing Account      
Resolution:        Patch/Upgrade
CVE Names:         CVE-2017-15906 CVE-2016-10012 CVE-2016-10011
                   CVE-2016-10010 CVE-2016-10009 

Reference:         ESB-2018.1889
                   ESB-2017.0784
                   ESB-2017.0572

Original Bulletin: 
   http://www.ubuntu.com/usn/usn-3538-1

- --------------------------BEGIN INCLUDED TEXT--------------------

==========================================================================
Ubuntu Security Notice USN-3538-1
January 22, 2018

openssh vulnerabilities
==========================================================================

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

- - Ubuntu 17.10
- - Ubuntu 16.04 LTS
- - Ubuntu 14.04 LTS

Summary:

Several security issues were fixed in OpenSSH.

Software Description:
- - openssh: secure shell (SSH) for secure access to remote machines

Details:

Jann Horn discovered that OpenSSH incorrectly loaded PKCS#11 modules from
untrusted directories. A remote attacker could possibly use this issue to
execute arbitrary PKCS#11 modules. This issue only affected Ubuntu 14.04
LTS and Ubuntu 16.04 LTS. (CVE-2016-10009)

Jann Horn discovered that OpenSSH incorrectly handled permissions on
Unix-domain sockets when privilege separation is disabled. A local attacker
could possibly use this issue to gain privileges. This issue only affected
Ubuntu 16.04 LTS. (CVE-2016-10010)

Jann Horn discovered that OpenSSH incorrectly handled certain buffer memory
operations. A local attacker could possibly use this issue to obtain
sensitive information. This issue only affected Ubuntu 14.04 LTS and Ubuntu
16.04 LTS. (CVE-2016-10011)

Guido Vranken discovered that OpenSSH incorrectly handled certain shared
memory manager operations. A local attacker could possibly use issue to
gain privileges. This issue only affected Ubuntu 14.04 LTS and Ubuntu 16.04
LTS. This issue only affected Ubuntu 14.04 LTS and Ubuntu 16.04 LTS.
(CVE-2016-10012)

Michal Zalewski discovered that OpenSSH incorrectly prevented write
operations in readonly mode. A remote attacker could possibly use this
issue to create zero-length files, leading to a denial of service.
(CVE-2017-15906)

Update instructions:

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

Ubuntu 17.10:
  openssh-server                  1:7.5p1-10ubuntu0.1

Ubuntu 16.04 LTS:
  openssh-server                  1:7.2p2-4ubuntu2.4

Ubuntu 14.04 LTS:
  openssh-server                  1:6.6p1-2ubuntu2.10

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

References:
  https://www.ubuntu.com/usn/usn-3538-1
  CVE-2016-10009, CVE-2016-10010, CVE-2016-10011, CVE-2016-10012,
  CVE-2017-15906

Package Information:
  https://launchpad.net/ubuntu/+source/openssh/1:7.5p1-10ubuntu0.1
  https://launchpad.net/ubuntu/+source/openssh/1:7.2p2-4ubuntu2.4
  https://launchpad.net/ubuntu/+source/openssh/1:6.6p1-2ubuntu2.10

- --------------------------END INCLUDED TEXT--------------------

You have received this e-mail bulletin as a result of your organisation's
registration with AusCERT. The mailing list you are subscribed to is
maintained within your organisation, so if you do not wish to continue
receiving these bulletins you should contact your local IT manager. If
you do not know who that is, please send an email to auscert@auscert.org.au
and we will forward your request to the appropriate person.

NOTE: Third Party Rights
This security bulletin is provided as a service to AusCERT's members.  As
AusCERT did not write the document quoted above, AusCERT has had no control
over its content. The decision to follow or act on information or advice
contained in this security bulletin is the responsibility of each user or
organisation, and should be considered in accordance with your organisation's
site policies and procedures. AusCERT takes no responsibility for consequences
which may arise from following or acting on information or advice contained in
this security bulletin.

NOTE: This is only the original release of the security bulletin.  It may
not be updated when updates to the original are made.  If downloading at
a later date, it is recommended that the bulletin is retrieved directly
from the author's website to ensure that the information is still current.

Contact information for the authors of the original document is included
in the Security Bulletin above.  If you have any questions or need further
information, please contact them directly.

Previous advisories and external security bulletins can be retrieved from:

        https://www.auscert.org.au/bulletins/

===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072

Internet Email: auscert@auscert.org.au
Facsimile:      (07) 3365 7031
Telephone:      (07) 3365 4417 (International: +61 7 3365 4417)
                AusCERT personnel answer during Queensland business hours
                which are GMT+10:00 (AEST).
                On call after hours for member emergencies only.
===========================================================================
-----BEGIN PGP SIGNATURE-----
Comment: http://www.auscert.org.au/render.html?it=1967
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=G7QY
-----END PGP SIGNATURE-----

« Back to bulletins