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CVE-2020-11931

Published: 16 April 2020

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;

Notes

AuthorNote
jdstrand
semi-public on 2020-04-16
the snap policy module is not included upstream and currently only
exists in Ubuntu. This module was added in 1:12.2-0ubuntu2 in 18.10.
pulseaudio 1:8.0-0ubuntu3.11 on 16.04 LTS added enforcing mediation
pulseaudio 1:11.1-1ubuntu7.5 on 18.04 LTS added enforcing mediation
initial CVSS calculation: attackVector: local, attackComplexity: low
priviliegesRequired: low, userInteraction: none, scope: unchanged,
confidentialityImpact: low, integrityImpact: none, availabilityImpact: none

Priority

Medium

Cvss 3 Severity Score

3.3

Score breakdown

Status

Package Release Status
pulseaudio
Launchpad, Ubuntu, Debian
upstream Not vulnerable

trusty Does not exist

xenial
Released (1:8.0-0ubuntu3.12)
bionic
Released (1:11.1-1ubuntu7.7)
eoan
Released (1:13.0-1ubuntu1.2)
focal
Released (1:13.99.1-1ubuntu3.2)

Severity score breakdown

Parameter Value
Base score 3.3
Attack vector Local
Attack complexity Low
Privileges required Low
User interaction None
Scope Unchanged
Confidentiality Low
Integrity impact None
Availability impact None
Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N