USN-3203-1: gtk-vnc vulnerabilities

20 February 2017

gtk-vnc vulnerabilities

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

  • Ubuntu 14.04 LTS
  • Ubuntu 12.04 LTS


gtk-vnc could be made to crash or run programs if it received specially crafted network traffic.

Software Description

  • gtk-vnc - VNC viewer widget


It was discovered that gtk-vnc incorrectly validated certain data. A malicious server could use this issue to cause gtk-vnc to crash, resulting in a denial of service, or possibly execute arbitrary code.

Update instructions

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

Ubuntu 14.04 LTS
libgtk-vnc-1.0-0 - 0.5.3-0ubuntu2.1
libgtk-vnc-2.0-0 - 0.5.3-0ubuntu2.1
libgvnc-1.0-0 - 0.5.3-0ubuntu2.1
Ubuntu 12.04 LTS
libgtk-vnc-1.0-0 - 0.5.0-1ubuntu1.1
libgtk-vnc-2.0-0 - 0.5.0-1ubuntu1.1
libgvnc-1.0-0 - 0.5.0-1ubuntu1.1

To update your system, please follow these instructions:

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