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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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