USN-4044-1: ZNC vulnerability

1 July 2019

znc vulnerability

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

  • Ubuntu 19.04
  • Ubuntu 18.10
  • Ubuntu 18.04 LTS
  • Ubuntu 16.04 LTS


znc could be made to crash or run programs as an administrator if it opened a specially crafted file.

Software Description

  • znc - advanced modular IRC bouncer


Fix vulnerability where an authenticated non-admin users could load a module with a crafted name, then escalate privileges and run arbitrary code.

Update instructions

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

Ubuntu 19.04
znc - 1.7.2-2ubuntu0.1
Ubuntu 18.10
znc - 1.7.1-2ubuntu0.2
Ubuntu 18.04 LTS
znc - 1.6.6-1ubuntu0.2
Ubuntu 16.04 LTS
znc - 1.6.3-1ubuntu0.2

To update your system, please follow these instructions:

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