Ubuntu 16.10 USN-3171-1 Moderate: LibVNCServer Denial of Service

ubuntu

January 11, 2017

Several security issues were fixed in LibVNCServer.

Summary

Several security issues were fixed in LibVNCServer.

Software Description:

- libvncserver: vnc server library

Details:

Josef Gajdusek discovered that the LibVNCServer client library incorrectly

handled certain FrameBufferUpdate messages. If a user were tricked into

connecting to a malicious server, an attacker could use this issue to cause

a denial of service, or possibly execute arbitrary code. (CVE-2016-9941,

CVE-2016-9942)

Topics Covered

security advisory software update Ubuntu moderate severity Denial of Service LibVNCServer

Update Instructions

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

Ubuntu 16.10:
  libvncclient1                   0.9.10+dfsg-3ubuntu0.16.10.1
  libvncserver1                   0.9.10+dfsg-3ubuntu0.16.10.1

Ubuntu 16.04 LTS:
  libvncclient1                   0.9.10+dfsg-3ubuntu0.16.04.1
  libvncserver1                   0.9.10+dfsg-3ubuntu0.16.04.1

Ubuntu 14.04 LTS:
  libvncserver0                   0.9.9+dfsg-1ubuntu1.2

Ubuntu 12.04 LTS:
  libvncserver0                   0.9.8.2-2ubuntu1.2

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