CVE-2020-11931: Ubuntu modifications to pulseaudio to provide snap security enforcement could be unloaded
First published: Thu Apr 16 2020(Updated: )
An Ubuntu-specific modification to Pulseaudio to provide security mediation for Snap-packaged applications was found to have a bypass of intended access restriction for snaps which plugs any of pulseaudio, audio-playback or audio-record via unloading the pulseaudio snap policy module. This issue affects: pulseaudio 1:8.0 versions prior to 1:8.0-0ubuntu3.12; 1:11.1 versions prior to 1:11.1-1ubuntu7.7; 1:13.0 versions prior to 1:13.0-1ubuntu1.2; 1:13.99.1 versions prior to 1:13.99.1-1ubuntu3.2;
Credit: security@ubuntu.com security@ubuntu.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| ubuntu/pulseaudio | <1:8.0-0ubuntu3.12 | 1:8.0-0ubuntu3.12 |
| ubuntu/pulseaudio | <1:11.1-1ubuntu7.7 | 1:11.1-1ubuntu7.7 |
| ubuntu/pulseaudio | <1:13.0-1ubuntu1.2 | 1:13.0-1ubuntu1.2 |
| ubuntu/pulseaudio | <1:13.99.1-1ubuntu3.2 | 1:13.99.1-1ubuntu3.2 |
| Pulseaudio Pulseaudio | <=1.8.0 | |
| Canonical Ubuntu Linux | =16.04 | |
| Canonical Ubuntu Linux | =18.04 | |
| Canonical Ubuntu Linux | =19.10 | |
| Canonical Ubuntu Linux | =20.04 |
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Reference Links
- https://forum.snapcraft.io/t/audio-switcher-pulseaudio-interface-auto-connect-request/16648/3
- https://usn.ubuntu.com/4355-1/
- https://launchpad.net/bugs/cve/CVE-2020-11931
- https://security-tracker.debian.org/tracker/CVE-2020-11931
- https://ubuntu.com/security/notices/USN-4355-1
- https://www.cve.org/CVERecord?id=CVE-2020-11931
- https://nvd.nist.gov/vuln/detail/CVE-2020-11931
- https://ubuntu.com/security/CVE-2020-11931
Frequently Asked Questions
What is CVE-2020-11931?
CVE-2020-11931 is an Ubuntu-specific modification to Pulseaudio that provides security mediation for Snap-packaged applications.
What is the severity of CVE-2020-11931?
The severity of CVE-2020-11931 is low with a CVSS score of 3.3.
Which versions of Pulseaudio are affected by CVE-2020-11931?
Pulseaudio versions 1:8.0-0ubuntu3.12, 1:11.1-1ubuntu7.7, 1:13.0-1ubuntu1.2, and 1:13.99.1-1ubuntu3.2 are affected by CVE-2020-11931.
How can I fix CVE-2020-11931?
To fix CVE-2020-11931, update your Pulseaudio package to the corresponding fixed version: 1:8.0-0ubuntu3.12, 1:11.1-1ubuntu7.7, 1:13.0-1ubuntu1.2, or 1:13.99.1-1ubuntu3.2.
Where can I find more information about CVE-2020-11931?
You can find more information about CVE-2020-11931 at the following references: [Link 1](https://forum.snapcraft.io/t/audio-switcher-pulseaudio-interface-auto-connect-request/16648/3), [Link 2](https://usn.ubuntu.com/4355-1/), [Link 3](https://launchpad.net/bugs/cve/CVE-2020-11931).
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