Vulnerability-Lookup

UBUNTU-CVE-2020-16123 (CVE-2020-16123)

Vulnerability from osv_ubuntu – Published: 2020-11-23 17:00 – Updated: 2026-04-22 07:39 – Source website

Details

An Ubuntu-specific patch in PulseAudio created a race condition where the snap policy module would fail to identify a client connection from a snap as coming from a snap if SCM_CREDENTIALS were missing, allowing the snap to connect to PulseAudio without proper confinement. This could be exploited by an attacker to expose sensitive information. Fixed in 1:13.99.3-1ubuntu2, 1:13.99.2-1ubuntu2.1, 1:13.99.1-1ubuntu3.8, 1:11.1-1ubuntu7.11, and 1:8.0-0ubuntu3.15.

Severity

4.7 (Medium)


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

4.4 (Medium)


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

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2020-16123	REPORT
	https://ubuntu.com/security/notices/USN-4640-1	ADVISORY
	https://www.cve.org/CVERecord?id=CVE-2020-16123	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "libpulse-mainloop-glib0",
            "binary_version": "1:8.0-0ubuntu3.15"
          },
          {
            "binary_name": "libpulse0",
            "binary_version": "1:8.0-0ubuntu3.15"
          },
          {
            "binary_name": "libpulsedsp",
            "binary_version": "1:8.0-0ubuntu3.15"
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            "binary_version": "1:8.0-0ubuntu3.15"
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          {
            "binary_name": "pulseaudio-esound-compat",
            "binary_version": "1:8.0-0ubuntu3.15"
          },
          {
            "binary_name": "pulseaudio-module-bluetooth",
            "binary_version": "1:8.0-0ubuntu3.15"
          },
          {
            "binary_name": "pulseaudio-module-droid",
            "binary_version": "1:8.0-0ubuntu3.15"
          },
          {
            "binary_name": "pulseaudio-module-gconf",
            "binary_version": "1:8.0-0ubuntu3.15"
          },
          {
            "binary_name": "pulseaudio-module-jack",
            "binary_version": "1:8.0-0ubuntu3.15"
          },
          {
            "binary_name": "pulseaudio-module-lirc",
            "binary_version": "1:8.0-0ubuntu3.15"
          },
          {
            "binary_name": "pulseaudio-module-raop",
            "binary_version": "1:8.0-0ubuntu3.15"
          },
          {
            "binary_name": "pulseaudio-module-trust-store",
            "binary_version": "1:8.0-0ubuntu3.15"
          },
          {
            "binary_name": "pulseaudio-module-x11",
            "binary_version": "1:8.0-0ubuntu3.15"
          },
          {
            "binary_name": "pulseaudio-module-zeroconf",
            "binary_version": "1:8.0-0ubuntu3.15"
          },
          {
            "binary_name": "pulseaudio-utils",
            "binary_version": "1:8.0-0ubuntu3.15"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:16.04:LTS",
        "name": "pulseaudio",
        "purl": "pkg:deb/ubuntu/pulseaudio@1:8.0-0ubuntu3.15?arch=source\u0026distro=xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1:8.0-0ubuntu3.15"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1:6.0-0ubuntu13",
        "1:7.1-1ubuntu1",
        "1:7.1-1ubuntu2",
        "1:7.1-1ubuntu3",
        "1:7.1-1ubuntu6",
        "1:7.1-1ubuntu7",
        "1:8.0-0ubuntu2",
        "1:8.0-0ubuntu3",
        "1:8.0-0ubuntu3.1",
        "1:8.0-0ubuntu3.2",
        "1:8.0-0ubuntu3.3",
        "1:8.0-0ubuntu3.4",
        "1:8.0-0ubuntu3.7",
        "1:8.0-0ubuntu3.8",
        "1:8.0-0ubuntu3.9",
        "1:8.0-0ubuntu3.10",
        "1:8.0-0ubuntu3.11",
        "1:8.0-0ubuntu3.12",
        "1:8.0-0ubuntu3.14"
      ]
    },
    {
      "ecosystem_specific": {
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            "binary_name": "libpulse-mainloop-glib0",
            "binary_version": "1:11.1-1ubuntu7.11"
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          {
            "binary_name": "libpulse0",
            "binary_version": "1:11.1-1ubuntu7.11"
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          {
            "binary_name": "libpulsedsp",
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          },
          {
            "binary_name": "pulseaudio",
            "binary_version": "1:11.1-1ubuntu7.11"
          },
          {
            "binary_name": "pulseaudio-equalizer",
            "binary_version": "1:11.1-1ubuntu7.11"
          },
          {
            "binary_name": "pulseaudio-esound-compat",
            "binary_version": "1:11.1-1ubuntu7.11"
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          {
            "binary_name": "pulseaudio-module-bluetooth",
            "binary_version": "1:11.1-1ubuntu7.11"
          },
          {
            "binary_name": "pulseaudio-module-gconf",
            "binary_version": "1:11.1-1ubuntu7.11"
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          {
            "binary_name": "pulseaudio-module-jack",
            "binary_version": "1:11.1-1ubuntu7.11"
          },
          {
            "binary_name": "pulseaudio-module-lirc",
            "binary_version": "1:11.1-1ubuntu7.11"
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          {
            "binary_name": "pulseaudio-module-raop",
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            "binary_name": "pulseaudio-utils",
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        "1:11.1-1ubuntu7.4",
        "1:11.1-1ubuntu7.5",
        "1:11.1-1ubuntu7.7",
        "1:11.1-1ubuntu7.8",
        "1:11.1-1ubuntu7.9",
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            "binary_version": "1:13.99.1-1ubuntu3.8"
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            "binary_version": "1:13.99.1-1ubuntu3.8"
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          {
            "binary_name": "pulseaudio-module-bluetooth",
            "binary_version": "1:13.99.1-1ubuntu3.8"
          },
          {
            "binary_name": "pulseaudio-module-gsettings",
            "binary_version": "1:13.99.1-1ubuntu3.8"
          },
          {
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            "binary_version": "1:13.99.1-1ubuntu3.8"
          },
          {
            "binary_name": "pulseaudio-module-lirc",
            "binary_version": "1:13.99.1-1ubuntu3.8"
          },
          {
            "binary_name": "pulseaudio-module-raop",
            "binary_version": "1:13.99.1-1ubuntu3.8"
          },
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            "binary_name": "pulseaudio-module-zeroconf",
            "binary_version": "1:13.99.1-1ubuntu3.8"
          },
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      },
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        "1:13.0-3ubuntu1",
        "1:13.0-3ubuntu2",
        "1:13.99.1-1ubuntu1",
        "1:13.99.1-1ubuntu2",
        "1:13.99.1-1ubuntu3",
        "1:13.99.1-1ubuntu3.2",
        "1:13.99.1-1ubuntu3.3",
        "1:13.99.1-1ubuntu3.4",
        "1:13.99.1-1ubuntu3.5",
        "1:13.99.1-1ubuntu3.6",
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      ]
    }
  ],
  "aliases": [],
  "details": "An Ubuntu-specific patch in PulseAudio created a race condition where the snap policy module would fail to identify a client connection from a snap as coming from a snap if SCM_CREDENTIALS were missing, allowing the snap to connect to PulseAudio without proper confinement. This could be exploited by an attacker to expose sensitive information. Fixed in 1:13.99.3-1ubuntu2, 1:13.99.2-1ubuntu2.1, 1:13.99.1-1ubuntu3.8, 1:11.1-1ubuntu7.11, and 1:8.0-0ubuntu3.15.",
  "id": "UBUNTU-CVE-2020-16123",
  "modified": "2026-04-22T07:39:29Z",
  "published": "2020-11-23T17:00:00Z",
  "references": [
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      "url": "https://ubuntu.com/security/CVE-2020-16123"
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    },
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      "type": "REPORT",
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  "schema_version": "1.7.0",
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      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2020-16123"
  ]
}

CVE-2020-16123 (GCVE-0-2020-16123)

Vulnerability from cvelistv5 – Published: 2020-12-03 23:15 – Updated: 2024-09-16 19:20

Title

Bypass of snapd pulseaudio restrictions

Summary

Severity

4.4 (Medium)


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

CWE

CWE-362 - Race Condition (Concurrent Execution using Shared Resource with Improper Synchronization)

Assigner

canonical mitre root

References

2 references

URL	Tags
https://launchpad.net/bugs/1895928	vendor-advisoryx_refsource_UBUNTU
https://ubuntu.com/USN-4640-1	vendor-advisoryx_refsource_UBUNTU

Impacted products

1 product

Vendor	Product	Version
Canonical	pulseaudio	Affected: 1:13.99.3-1 , < 1:13.99.3-1ubuntu2 (custom) Affected: 1:13.99.2-1 , < 1:13.99.2-1ubuntu2.1 (custom) Affected: 1:13.99.1-1 , < 1:13.99.1-1ubuntu3.8 (custom) Affected: 1:11.1-1 , < 1:11.1-1ubuntu7.11 (custom) Affected: 1:8.0-0 , < 1:8.0-0ubuntu3.15 (custom)

Date Public

2020-11-23 00:00

Credits

James Henstridge

Show details on NVD website

JSON

To clipboard

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}

USN-4640-1 (UBUNTU-CVE-2020-16123)

Vulnerability from osv_ubuntu – Published: 2020-11-23 16:03 – Updated: 2026-04-22 07:36 – Source website

Summary

pulseaudio vulnerability

Details

James Henstridge discovered that an Ubuntu-specific patch caused PulseAudio to incorrectly handle snap client connections. An attacker could possibly use this to expose sensitive information.

References

URL

Type

	https://ubuntu.com/security/notices/USN-4640-1	ADVISORY
	https://ubuntu.com/security/CVE-2020-16123	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2020-16123",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:N/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:16.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "libpulse-mainloop-glib0",
            "binary_version": "1:8.0-0ubuntu3.15"
          },
          {
            "binary_name": "libpulse0",
            "binary_version": "1:8.0-0ubuntu3.15"
          },
          {
            "binary_name": "libpulsedsp",
            "binary_version": "1:8.0-0ubuntu3.15"
          },
          {
            "binary_name": "pulseaudio",
            "binary_version": "1:8.0-0ubuntu3.15"
          },
          {
            "binary_name": "pulseaudio-esound-compat",
            "binary_version": "1:8.0-0ubuntu3.15"
          },
          {
            "binary_name": "pulseaudio-module-bluetooth",
            "binary_version": "1:8.0-0ubuntu3.15"
          },
          {
            "binary_name": "pulseaudio-module-droid",
            "binary_version": "1:8.0-0ubuntu3.15"
          },
          {
            "binary_name": "pulseaudio-module-gconf",
            "binary_version": "1:8.0-0ubuntu3.15"
          },
          {
            "binary_name": "pulseaudio-module-jack",
            "binary_version": "1:8.0-0ubuntu3.15"
          },
          {
            "binary_name": "pulseaudio-module-lirc",
            "binary_version": "1:8.0-0ubuntu3.15"
          },
          {
            "binary_name": "pulseaudio-module-raop",
            "binary_version": "1:8.0-0ubuntu3.15"
          },
          {
            "binary_name": "pulseaudio-module-trust-store",
            "binary_version": "1:8.0-0ubuntu3.15"
          },
          {
            "binary_name": "pulseaudio-module-x11",
            "binary_version": "1:8.0-0ubuntu3.15"
          },
          {
            "binary_name": "pulseaudio-module-zeroconf",
            "binary_version": "1:8.0-0ubuntu3.15"
          },
          {
            "binary_name": "pulseaudio-utils",
            "binary_version": "1:8.0-0ubuntu3.15"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:16.04:LTS",
        "name": "pulseaudio",
        "purl": "pkg:deb/ubuntu/pulseaudio@1:8.0-0ubuntu3.15?arch=source\u0026distro=xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1:8.0-0ubuntu3.15"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1:6.0-0ubuntu13",
        "1:7.1-1ubuntu1",
        "1:7.1-1ubuntu2",
        "1:7.1-1ubuntu3",
        "1:7.1-1ubuntu6",
        "1:7.1-1ubuntu7",
        "1:8.0-0ubuntu2",
        "1:8.0-0ubuntu3",
        "1:8.0-0ubuntu3.1",
        "1:8.0-0ubuntu3.2",
        "1:8.0-0ubuntu3.3",
        "1:8.0-0ubuntu3.4",
        "1:8.0-0ubuntu3.7",
        "1:8.0-0ubuntu3.8",
        "1:8.0-0ubuntu3.9",
        "1:8.0-0ubuntu3.10",
        "1:8.0-0ubuntu3.11",
        "1:8.0-0ubuntu3.12",
        "1:8.0-0ubuntu3.14"
      ]
    },
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2020-16123",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:N/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:18.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "libpulse-mainloop-glib0",
            "binary_version": "1:11.1-1ubuntu7.11"
          },
          {
            "binary_name": "libpulse0",
            "binary_version": "1:11.1-1ubuntu7.11"
          },
          {
            "binary_name": "libpulsedsp",
            "binary_version": "1:11.1-1ubuntu7.11"
          },
          {
            "binary_name": "pulseaudio",
            "binary_version": "1:11.1-1ubuntu7.11"
          },
          {
            "binary_name": "pulseaudio-equalizer",
            "binary_version": "1:11.1-1ubuntu7.11"
          },
          {
            "binary_name": "pulseaudio-esound-compat",
            "binary_version": "1:11.1-1ubuntu7.11"
          },
          {
            "binary_name": "pulseaudio-module-bluetooth",
            "binary_version": "1:11.1-1ubuntu7.11"
          },
          {
            "binary_name": "pulseaudio-module-gconf",
            "binary_version": "1:11.1-1ubuntu7.11"
          },
          {
            "binary_name": "pulseaudio-module-jack",
            "binary_version": "1:11.1-1ubuntu7.11"
          },
          {
            "binary_name": "pulseaudio-module-lirc",
            "binary_version": "1:11.1-1ubuntu7.11"
          },
          {
            "binary_name": "pulseaudio-module-raop",
            "binary_version": "1:11.1-1ubuntu7.11"
          },
          {
            "binary_name": "pulseaudio-module-zeroconf",
            "binary_version": "1:11.1-1ubuntu7.11"
          },
          {
            "binary_name": "pulseaudio-utils",
            "binary_version": "1:11.1-1ubuntu7.11"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "pulseaudio",
        "purl": "pkg:deb/ubuntu/pulseaudio@1:11.1-1ubuntu7.11?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1:11.1-1ubuntu7.11"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1:10.0-2ubuntu3",
        "1:11.1-1ubuntu1",
        "1:11.1-1ubuntu2",
        "1:11.1-1ubuntu4",
        "1:11.1-1ubuntu5",
        "1:11.1-1ubuntu6",
        "1:11.1-1ubuntu7",
        "1:11.1-1ubuntu7.1",
        "1:11.1-1ubuntu7.2",
        "1:11.1-1ubuntu7.4",
        "1:11.1-1ubuntu7.5",
        "1:11.1-1ubuntu7.7",
        "1:11.1-1ubuntu7.8",
        "1:11.1-1ubuntu7.9",
        "1:11.1-1ubuntu7.10"
      ]
    },
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2020-16123",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:N/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:20.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "libpulse-mainloop-glib0",
            "binary_version": "1:13.99.1-1ubuntu3.8"
          },
          {
            "binary_name": "libpulse0",
            "binary_version": "1:13.99.1-1ubuntu3.8"
          },
          {
            "binary_name": "libpulsedsp",
            "binary_version": "1:13.99.1-1ubuntu3.8"
          },
          {
            "binary_name": "pulseaudio",
            "binary_version": "1:13.99.1-1ubuntu3.8"
          },
          {
            "binary_name": "pulseaudio-equalizer",
            "binary_version": "1:13.99.1-1ubuntu3.8"
          },
          {
            "binary_name": "pulseaudio-module-bluetooth",
            "binary_version": "1:13.99.1-1ubuntu3.8"
          },
          {
            "binary_name": "pulseaudio-module-gsettings",
            "binary_version": "1:13.99.1-1ubuntu3.8"
          },
          {
            "binary_name": "pulseaudio-module-jack",
            "binary_version": "1:13.99.1-1ubuntu3.8"
          },
          {
            "binary_name": "pulseaudio-module-lirc",
            "binary_version": "1:13.99.1-1ubuntu3.8"
          },
          {
            "binary_name": "pulseaudio-module-raop",
            "binary_version": "1:13.99.1-1ubuntu3.8"
          },
          {
            "binary_name": "pulseaudio-module-zeroconf",
            "binary_version": "1:13.99.1-1ubuntu3.8"
          },
          {
            "binary_name": "pulseaudio-utils",
            "binary_version": "1:13.99.1-1ubuntu3.8"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "pulseaudio",
        "purl": "pkg:deb/ubuntu/pulseaudio@1:13.99.1-1ubuntu3.8?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1:13.99.1-1ubuntu3.8"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1:13.0-1ubuntu1",
        "1:13.0-1ubuntu4",
        "1:13.0-1ubuntu5",
        "1:13.0-3ubuntu1",
        "1:13.0-3ubuntu2",
        "1:13.99.1-1ubuntu1",
        "1:13.99.1-1ubuntu2",
        "1:13.99.1-1ubuntu3",
        "1:13.99.1-1ubuntu3.2",
        "1:13.99.1-1ubuntu3.3",
        "1:13.99.1-1ubuntu3.4",
        "1:13.99.1-1ubuntu3.5",
        "1:13.99.1-1ubuntu3.6",
        "1:13.99.1-1ubuntu3.7"
      ]
    }
  ],
  "aliases": [],
  "details": "James Henstridge discovered that an Ubuntu-specific patch caused\nPulseAudio to incorrectly handle snap client connections. An attacker\ncould possibly use this to expose sensitive information.\n",
  "id": "USN-4640-1",
  "modified": "2026-04-22T07:36:58Z",
  "published": "2020-11-23T16:03:54Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-4640-1"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2020-16123"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "summary": "pulseaudio vulnerability",
  "upstream": [
    "UBUNTU-CVE-2020-16123"
  ]
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

UBUNTU-CVE-2020-16123 (CVE-2020-16123)

CVE-2020-16123 (GCVE-0-2020-16123)

USN-4640-1 (UBUNTU-CVE-2020-16123)

Tags

Sightings

Nomenclature

Related by attack behaviour