ESB-2017.2071 - [Linux][Ubuntu] c-ares: Denial of service - Remote with user interaction 2017-08-18

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

                               ESB-2017.2071
                           c-ares vulnerability
                              18 August 2017

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

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

Product:           c-ares
Publisher:         Ubuntu
Operating System:  Ubuntu
                   Linux variants
Impact/Access:     Denial of Service -- Remote with User Interaction
Resolution:        Patch/Upgrade
CVE Names:         CVE-2017-1000381  

Original Bulletin: 
   http://www.ubuntu.com/usn/usn-3395-1

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

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==========================================================================
Ubuntu Security Notice USN-3395-1
August 17, 2017

c-ares vulnerability
==========================================================================

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

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

Summary:

c-ares could be made to crash if it received specially crafted network
traffic.

Software Description:
- - c-ares: library for asynchronous name resolution

Details:

It was discovered that c-ares incorrectly handled certain NAPTR responses.
A remote attacker could possibly use this issue to cause applications using
c-ares to crash, 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:
  libc-ares2                      1.12.0-1ubuntu0.1

Ubuntu 16.04 LTS:
  libc-ares2                      1.10.0-3ubuntu0.2

Ubuntu 14.04 LTS:
  libc-ares2                      1.10.0-2ubuntu0.2

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

References:
  https://www.ubuntu.com/usn/usn-3395-1
  CVE-2017-1000381

Package Information:
  https://launchpad.net/ubuntu/+source/c-ares/1.12.0-1ubuntu0.1
  https://launchpad.net/ubuntu/+source/c-ares/1.10.0-3ubuntu0.2
  https://launchpad.net/ubuntu/+source/c-ares/1.10.0-2ubuntu0.2

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