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Ubuntu Security Notice USN-3203-1
February 20, 2017

gtk-vnc vulnerabilities
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 14.04 LTS
- Ubuntu 12.04 LTS

Summary:

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

Software Description:
- gtk-vnc: VNC viewer widget

Details:

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

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

References:
  http://www.ubuntu.com/usn/usn-3203-1
  CVE-2017-5884, CVE-2017-5885

Package Information:
  https://launchpad.net/ubuntu/+source/gtk-vnc/0.5.3-0ubuntu2.1
  https://launchpad.net/ubuntu/+source/gtk-vnc/0.5.0-1ubuntu1.1