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    Ubuntu 4355-1: PulseAudio vulnerability

    Date
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    PulseAudio could allow unintended access to snap packages.
    ==========================================================================
    Ubuntu Security Notice USN-4355-1
    May 12, 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
    
    After a standard system update you need to restart your session to make
    all the necessary changes.
    
    References:
      https://usn.ubuntu.com/4355-1
      CVE-2020-11931, https://launchpad.net/bugs/1877102
    
    Package Information:
      https://launchpad.net/ubuntu/+source/pulseaudio/1:13.99.1-1ubuntu3.2
      https://launchpad.net/ubuntu/+source/pulseaudio/1:13.0-1ubuntu1.2
      https://launchpad.net/ubuntu/+source/pulseaudio/1:11.1-1ubuntu7.7
      https://launchpad.net/ubuntu/+source/pulseaudio/1:8.0-0ubuntu3.12
    

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