USN-3618-1: LibVNCServer vulnerability

04 April 2018

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



  • libvncserver - vnc server library


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
Ubuntu 16.04
Ubuntu 14.04

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


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