USN-3877-1: LibVNCServer vulnerabilities

31 January 2019

libvncserver vulnerabilities

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

  • Ubuntu 18.10
  • Ubuntu 18.04 LTS
  • Ubuntu 16.04 LTS
  • Ubuntu 14.04 LTS


Several security issues were fixed in LibVNCServer.

Software Description

  • libvncserver - vnc server library


It was discovered that LibVNCServer incorrectly handled certain operations. A remote attacker able to connect to applications using 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 18.10
libvncclient1 - 0.9.11+dfsg-1.1ubuntu0.1
libvncserver1 - 0.9.11+dfsg-1.1ubuntu0.1
Ubuntu 18.04 LTS
libvncclient1 - 0.9.11+dfsg-1ubuntu1.1
libvncserver1 - 0.9.11+dfsg-1ubuntu1.1
Ubuntu 16.04 LTS
libvncclient1 - 0.9.10+dfsg-3ubuntu0.16.04.3
libvncserver1 - 0.9.10+dfsg-3ubuntu0.16.04.3
Ubuntu 14.04 LTS
libvncserver0 - 0.9.9+dfsg-1ubuntu1.4

To update your system, please follow these instructions:

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