USN-4355-1: PulseAudio vulnerability

12 May 2020

pulseaudio vulnerability

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

  • Ubuntu 20.04 LTS
  • Ubuntu 19.10
  • Ubuntu 18.04 LTS
  • Ubuntu 16.04 LTS

Summary

PulseAudio could allow unintended access to snap packages.

Software Description

  • pulseaudio - PulseAudio sound server

Details

PulseAudio in Ubuntu contains additional functionality to mediate audio recording for snap packages and it was discovered that this functionality did not mediate PulseAudio module unloading. An attacker-controlled snap with only the audio-playback interface connected could exploit this to bypass access controls and record audio.

Update instructions

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

Ubuntu 20.04 LTS
pulseaudio - 1:13.99.1-1ubuntu3.2
Ubuntu 19.10
pulseaudio - 1:13.0-1ubuntu1.2
Ubuntu 18.04 LTS
pulseaudio - 1:11.1-1ubuntu7.7
Ubuntu 16.04 LTS
pulseaudio - 1:8.0-0ubuntu3.12

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

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

References