ESB-2018.1027 - [Ubuntu] libvncclient1: Execute arbitrary code/commands - Remote with user interaction 2018-04-05

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

                               ESB-2018.1027
                        LibVNCServer vulnerability
                               5 April 2018

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

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

Product:           libvncclient1
Publisher:         Ubuntu
Operating System:  Ubuntu
Impact/Access:     Execute Arbitrary Code/Commands -- Remote with User Interaction
                   Denial of Service               -- Existing Account            
                   Access Confidential Data        -- Existing Account            
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-7225  

Reference:         ESB-2018.0947
                   ESB-2018.0883

Original Bulletin: 
   http://www.ubuntu.com/usn/usn-3618-1

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==========================================================================
Ubuntu Security Notice USN-3618-1
April 04, 2018

libvncserver vulnerability
==========================================================================

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

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

Summary:

LibVNCServer could be made to crash, expose sensitive information, or run
programs if it received specially crafted network traffic.

Software Description:
- - libvncserver: vnc server library

Details:

It was discovered that LibVNCServer incorrectly handled certain packet
lengths. A remote attacker able to connect to a LibVNCServer could possibly
use this issue to obtain sensitive information, cause a denial of service,
or execute arbitrary code.

Update instructions:

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

Ubuntu 17.10:
  libvncclient1                   0.9.11+dfsg-1ubuntu0.1
  libvncserver1                   0.9.11+dfsg-1ubuntu0.1

Ubuntu 16.04 LTS:
  libvncserver1                   0.9.10+dfsg-3ubuntu0.16.04.2

Ubuntu 14.04 LTS:
  libvncserver0                   0.9.9+dfsg-1ubuntu1.3

After a standard system update you need to restart LibVNCServer
applications to make all the necessary changes.

References:
  https://usn.ubuntu.com/usn/usn-3618-1
  CVE-2018-7225

Package Information:
  https://launchpad.net/ubuntu/+source/libvncserver/0.9.11+dfsg-1ubuntu0.1
  https://launchpad.net/ubuntu/+source/libvncserver/0.9.10+dfsg-3ubuntu0.16.04.2
  https://launchpad.net/ubuntu/+source/libvncserver/0.9.9+dfsg-1ubuntu1.3

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