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CanonicalCVE-2020-11931

HistoryMay 15, 2020 - 4:15 a.m.

CVE-2020-11931

2020-05-1504:15:10

CWE-668

CWE-284

canonical

web.nvd.nist.gov

132

cve-2020-11931

ubuntu

pulseaudio

snap

bypass

security mediation

access restriction

nvd

CVSS2

2.1

Attack Vector

LOCAL

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

NONE

Availability Impact

NONE

AV:L/AC:L/Au:N/C:P/I:N/A:N

CVSS3

3.3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

LOW

Integrity Impact

NONE

Availability Impact

NONE

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

AI Score

Confidence

High

EPSS

Percentile

12.6%

JSON

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;

Affected configurations

Nvd

Node

pulseaudiopulseaudioRange≤1.8.0

Node

canonicalubuntu_linuxMatch16.04lts

canonicalubuntu_linuxMatch18.04lts

canonicalubuntu_linuxMatch19.10

canonicalubuntu_linuxMatch20.04lts

VendorProductVersionCPE
pulseaudiopulseaudio*cpe:2.3:a:pulseaudio:pulseaudio:*:*:*:*:*:*:*:*
canonicalubuntu_linux16.04cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*
canonicalubuntu_linux18.04cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*
canonicalubuntu_linux19.10cpe:2.3:o:canonical:ubuntu_linux:19.10:*:*:*:*:*:*:*
canonicalubuntu_linux20.04cpe:2.3:o:canonical:ubuntu_linux:20.04:*:*:*:lts:*:*:*

Vendor	Product	Version	CPE
pulseaudio	pulseaudio	*	cpe:2.3:a:pulseaudio:pulseaudio::::::::
canonical	ubuntu_linux	16.04	cpe:2.3:o:canonical:ubuntu_linux:16.04::::lts:::
canonical	ubuntu_linux	18.04	cpe:2.3:o:canonical:ubuntu_linux:18.04::::lts:::
canonical	ubuntu_linux	19.10	cpe:2.3:o:canonical:ubuntu_linux:19.10:::::::*
canonical	ubuntu_linux	20.04	cpe:2.3:o:canonical:ubuntu_linux:20.04::::lts:::

CNA Affected

[
  {
    "product": "pulseaudio",
    "vendor": "Canonical",
    "versions": [
      {
        "lessThan": "1:8.0-0ubuntu3.12",
        "status": "affected",
        "version": "1:8.0",
        "versionType": "custom"
      },
      {
        "lessThan": "1:11.1-1ubuntu7.7",
        "status": "affected",
        "version": "1:11.1",
        "versionType": "custom"
      },
      {
        "lessThan": "1:13.0-1ubuntu1.2",
        "status": "affected",
        "version": "1:13.0",
        "versionType": "custom"
      },
      {
        "lessThan": "1:13.99.1-1ubuntu3.2",
        "status": "affected",
        "version": "1:13.99.1",
        "versionType": "custom"
      }
    ]
  }
]

References

forum.snapcraft.io/t/audio-switcher-pulseaudio-interface-auto-connect-request/16648/3

usn.ubuntu.com/4355-1/

CVSS2

2.1

Attack Vector

LOCAL

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

NONE

Availability Impact

NONE

AV:L/AC:L/Au:N/C:P/I:N/A:N

CVSS3

3.3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

LOW

Integrity Impact

NONE

Availability Impact

NONE

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

AI Score

Confidence

High

EPSS

Percentile

12.6%

JSON

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