==========================================================================
Ubuntu Security Notice USN-4636-1
November 17, 2020

libvncserver, vino vulnerability
==========================================================================

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

– Ubuntu 20.10
– Ubuntu 20.04 LTS
– Ubuntu 18.04 LTS
– Ubuntu 16.04 LTS

Summary:

LibVNCServer and Vino could be made to crash.

Software Description:
– vino: VNC server for GNOME
– libvncserver: vnc server library

Details:

It was discovered that LibVNCServer incorrectly handled certain internals.
An attacker could possibly use this issue to cause a denial of service.
This issue only affected Ubuntu 16.04 LTS, Ubuntu 18.04 LTS and Ubuntu 20.04 LTS.

Vino package ships with a LibVNCServer source and all listed releases were
affected for this package.

Update instructions:

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

Ubuntu 20.10:
vino 3.22.0-6ubuntu2.1

Ubuntu 20.04 LTS:
libvncclient1 0.9.12+dfsg-9ubuntu0.3
libvncserver1 0.9.12+dfsg-9ubuntu0.3
vino 3.22.0-5ubuntu2.2

Ubuntu 18.04 LTS:
libvncclient1 0.9.11+dfsg-1ubuntu1.4
libvncserver1 0.9.11+dfsg-1ubuntu1.4
vino 3.22.0-3ubuntu1.2

Ubuntu 16.04 LTS:
libvncclient1 0.9.10+dfsg-3ubuntu0.16.04.6
libvncserver1 0.9.10+dfsg-3ubuntu0.16.04.6
vino 3.8.1-0ubuntu9.4

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

References:
https://usn.ubuntu.com/4636-1
CVE-2020-25708

Package Information:
https://launchpad.net/ubuntu/+source/vino/3.22.0-6ubuntu2.1
https://launchpad.net/ubuntu/+source/libvncserver/0.9.12+dfsg-9ubuntu0.3
https://launchpad.net/ubuntu/+source/vino/3.22.0-5ubuntu2.2
https://launchpad.net/ubuntu/+source/libvncserver/0.9.11+dfsg-1ubuntu1.4
https://launchpad.net/ubuntu/+source/vino/3.22.0-3ubuntu1.2
https://launchpad.net/ubuntu/+source/libvncserver/0.9.10+dfsg-3ubuntu0.16.04.6
https://launchpad.net/ubuntu/+source/vino/3.8.1-0ubuntu9.4
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