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             AUSCERT External Security Bulletin Redistribution

                   USN-4355-1: PulseAudio vulnerability
                                13 May 2020


        AusCERT Security Bulletin Summary

Product:           PulseAudio
Publisher:         Ubuntu
Operating System:  Ubuntu
                   UNIX variants (UNIX, Linux, OSX)
Impact/Access:     Access Confidential Data -- Remote with User Interaction
                   Unauthorised Access      -- Remote with User Interaction
Resolution:        Patch/Upgrade
CVE Names:         CVE-2020-11931  

Original Bulletin: 

Comment: This advisory references vulnerabilities in products which run on 
         platforms other than Ubuntu. It is recommended that administrators 
         running PulseAudio check for an updated version of the software for
         their operating system.

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USN-4355-1: PulseAudio vulnerability
12 May 2020

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

  o Ubuntu 20.04 LTS
  o Ubuntu 19.10
  o Ubuntu 18.04 LTS
  o Ubuntu 16.04 LTS


PulseAudio could allow unintended access to snap packages.

Software Description

  o pulseaudio - PulseAudio sound server


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

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.


  o CVE-2020-11931
  o LP: 1877102

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