ESB-2017.1781 - [Ubuntu] lib64expat1: Denial of service - Remote with user interaction 2017-07-20

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

                               ESB-2017.1781
                            Expat vulnerability
                               20 July 2017

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

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

Product:           lib64expat1
Publisher:         Ubuntu
Operating System:  Ubuntu
Impact/Access:     Denial of Service -- Remote with User Interaction
Resolution:        Patch/Upgrade
CVE Names:         CVE-2017-9233  

Reference:         ESB-2017.1598

Original Bulletin: 
   http://www.ubuntu.com/usn/usn-3356-1

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==========================================================================
Ubuntu Security Notice USN-3356-1
July 19, 2017

expat vulnerability
==========================================================================

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

- - Ubuntu 17.04
- - Ubuntu 16.10
- - Ubuntu 16.04 LTS
- - Ubuntu 14.04 LTS

Summary:

Expat could be made to hang if it received specially crafted input.

Software Description:
- - expat: XML parsing C library

Details:

It was discovered that Expat incorrectly handled certain external entities.
A remote attacker could possibly use this issue to cause Expat to hang,
resulting in a denial of service.

Update instructions:

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

Ubuntu 17.04:
  lib64expat1                     2.2.0-2ubuntu0.1
  libexpat1                       2.2.0-2ubuntu0.1

Ubuntu 16.10:
  lib64expat1                     2.2.0-1ubuntu0.1
  libexpat1                       2.2.0-1ubuntu0.1

Ubuntu 16.04 LTS:
  lib64expat1                     2.1.0-7ubuntu0.16.04.3
  libexpat1                       2.1.0-7ubuntu0.16.04.3

Ubuntu 14.04 LTS:
  lib64expat1                     2.1.0-4ubuntu1.4
  libexpat1                       2.1.0-4ubuntu1.4

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

References:
  https://www.ubuntu.com/usn/usn-3356-1
  CVE-2017-9233

Package Information:
  https://launchpad.net/ubuntu/+source/expat/2.2.0-2ubuntu0.1
  https://launchpad.net/ubuntu/+source/expat/2.2.0-1ubuntu0.1
  https://launchpad.net/ubuntu/+source/expat/2.1.0-7ubuntu0.16.04.3
  https://launchpad.net/ubuntu/+source/expat/2.1.0-4ubuntu1.4

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