[USN-3618-1] LibVNCServer vulnerability

[Marc Deslauriers]

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