USN-3950-1: ZNC vulnerability

18 April 2019

znc vulnerability

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

  • Ubuntu 18.10


ZNC could be made to crash or run programs if it received specially crafted network traffic.

Software Description

  • znc - advanced modular IRC bouncer


It was discovered that ZNC incorrectly handled certain invalid encodings. An authenticated remote user could use this issue to cause ZNC to crash, resulting in a denial of service, or possibly execute arbitrary code.

Update instructions

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

Ubuntu 18.10
znc - 1.7.1-2ubuntu0.1

To update your system, please follow these instructions:

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