USN-3171-1: LibVNCServer vulnerabilities

USN-3171-1: LibVNCServer vulnerabilities

Ubuntu Security Notice USN-3171-1

11th January, 2017

libvncserver vulnerabilities

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

• Ubuntu 16.10
• Ubuntu 16.04 LTS
• Ubuntu 14.04 LTS
• Ubuntu 12.04 LTS

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)

Update instructions

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

Ubuntu 16.10:

libvncserver1

0.9.10+dfsg-3ubuntu0.16.10.1

libvncclient1

0.9.10+dfsg-3ubuntu0.16.10.1

Ubuntu 16.04 LTS:

libvncserver1

0.9.10+dfsg-3ubuntu0.16.04.1

libvncclient1

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

To update your system, please follow these instructions:
https://wiki.ubuntu.com/Security/Upgrades.

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

References

CVE-2016-9941,

CVE-2016-9942

Source: USN-3171-1: LibVNCServer vulnerabilities