Ubuntu 18.04 LTS: USN-3877-1 Critical: LibVNCServer Denial Of Service

ubuntu

January 31, 2019

Several security issues were fixed in LibVNCServer.

Summary

Several security issues were fixed in LibVNCServer.

Software Description:

- libvncserver: vnc server library

Details:

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.

Topics Covered

security advisory denial of service critical ubuntu libvncserver

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

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