libvncserver vulnerabilities

31 January 2019

libvncserver vulnerabilities

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

• Ubuntu 18.10
• Ubuntu 18.04 LTS
• Ubuntu 16.04 LTS
• Ubuntu 14.04 LTS

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.

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

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

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

References

• CVE-2018-15126
• CVE-2018-15127
• CVE-2018-20019
• CVE-2018-20020
• CVE-2018-20021
• CVE-2018-20022
• CVE-2018-20023
• CVE-2018-20024
• CVE-2018-20748
• CVE-2018-20749
• CVE-2018-20750
• CVE-2018-6307