USN-3618-1: LibVNCServer vulnerability

libvncserver vulnerability

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

  • Ubuntu 17.10
  • Ubuntu 16.04 LTS
  • Ubuntu 14.04 LTS

Summary

LibVNCServer could be made to crash, expose sensitive information, or run
programs if it received specially crafted network traffic.

Software Description

  • libvncserver – vnc server library

Details

It was discovered that LibVNCServer incorrectly handled certain packet
lengths. A remote attacker able to connect to a 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 17.10
libvncclient10.9.11+dfsg-1ubuntu0.1
libvncserver10.9.11+dfsg-1ubuntu0.1
Ubuntu 16.04 LTS
libvncserver10.9.10+dfsg-3ubuntu0.16.04.2
Ubuntu 14.04 LTS
libvncserver00.9.9+dfsg-1ubuntu1.3

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

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