ESB-2018.3046 - [Linux][Ubuntu] libxkbcommon: Denial of service - Remote with user interaction 2018-10-09

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2018.3046
                       libxkbcommon vulnerabilities
                              9 October 2018

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

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

Product:           libxkbcommon
Publisher:         Ubuntu
Operating System:  Ubuntu
                   Linux variants
Impact/Access:     Denial of Service -- Remote with User Interaction
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-15864 CVE-2018-15863 CVE-2018-15862
                   CVE-2018-15861 CVE-2018-15859 CVE-2018-15858
                   CVE-2018-15857 CVE-2018-15856 CVE-2018-15855
                   CVE-2018-15854 CVE-2018-15853 

Original Bulletin: 
   http://www.ubuntu.com/usn/usn-3786-1

Comment: This advisory references vulnerabilities in products which run on 
         platforms other than Ubuntu. It is recommended that administrators 
         running libxkbcommon check for an updated version of the software 
         for their operating system.

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==========================================================================
Ubuntu Security Notice USN-3786-1
October 08, 2018

libxkbcommon vulnerabilities
==========================================================================

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

- - Ubuntu 16.04 LTS
- - Ubuntu 14.04 LTS

Summary:

Several security issues were fixed in libxkbcommon.

Software Description:
- - libxkbcommon: library interface to the XKB compiler - development
files

Details:

It was discovered that libxkbcommon incorrectly handled certain files.
An attacker could possibly use this issue to cause a denial of service.
(CVE-2018-15853, CVE-2018-15854, CVE-2018-15855, CVE-2018-15856,
CVE-2018-15857, CVE-2018-15858, CVE-2018-15859, CVE-2018-15861,
CVE-2018-15862, CVE-2018-15863, CVE-2018-15864)

Update instructions:

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

Ubuntu 16.04 LTS:
  libxkbcommon-x11-0              0.5.0-1ubuntu2.1
  libxkbcommon0                   0.5.0-1ubuntu2.1

Ubuntu 14.04 LTS:
  libxkbcommon-x11-0              0.4.1-0ubuntu1.1
  libxkbcommon0                   0.4.1-0ubuntu1.1

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

References:
  https://usn.ubuntu.com/usn/usn-3786-1
  CVE-2018-15853, CVE-2018-15854, CVE-2018-15855, CVE-2018-15856,
  CVE-2018-15857, CVE-2018-15858, CVE-2018-15859, CVE-2018-15861,
  CVE-2018-15862, CVE-2018-15863, CVE-2018-15864

Package Information:
  https://launchpad.net/ubuntu/+source/libxkbcommon/0.5.0-1ubuntu2.1
  https://launchpad.net/ubuntu/+source/libxkbcommon/0.4.1-0ubuntu1.1

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