ubuntu-cve-2021-31523
Vulnerability from osv_ubuntu
Published
2021-04-21 19:15
Modified
2026-05-20 14:53
Summary
Details

The Debian xscreensaver 5.42+dfsg1-1 package for XScreenSaver has cap_net_raw enabled for the /usr/libexec/xscreensaver/sonar file, which allows local users to gain privileges because this is arguably incompatible with the design of the Mesa 3D Graphics library dependency.

Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
N/A (UNKNOWN)
medium
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "xscreensaver",
            "binary_version": "5.34-2ubuntu1"
          },
          {
            "binary_name": "xscreensaver-data",
            "binary_version": "5.34-2ubuntu1"
          },
          {
            "binary_name": "xscreensaver-data-extra",
            "binary_version": "5.34-2ubuntu1"
          },
          {
            "binary_name": "xscreensaver-gl",
            "binary_version": "5.34-2ubuntu1"
          },
          {
            "binary_name": "xscreensaver-gl-extra",
            "binary_version": "5.34-2ubuntu1"
          },
          {
            "binary_name": "xscreensaver-screensaver-bsod",
            "binary_version": "5.34-2ubuntu1"
          },
          {
            "binary_name": "xscreensaver-screensaver-webcollage",
            "binary_version": "5.34-2ubuntu1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:16.04:LTS",
        "name": "xscreensaver",
        "purl": "pkg:deb/ubuntu/xscreensaver@5.34-2ubuntu1?arch=source\u0026distro=xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "5.30-1ubuntu1",
        "5.34-1ubuntu1",
        "5.34-2ubuntu1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "xscreensaver",
            "binary_version": "5.36-1ubuntu1"
          },
          {
            "binary_name": "xscreensaver-data",
            "binary_version": "5.36-1ubuntu1"
          },
          {
            "binary_name": "xscreensaver-data-extra",
            "binary_version": "5.36-1ubuntu1"
          },
          {
            "binary_name": "xscreensaver-gl",
            "binary_version": "5.36-1ubuntu1"
          },
          {
            "binary_name": "xscreensaver-gl-extra",
            "binary_version": "5.36-1ubuntu1"
          },
          {
            "binary_name": "xscreensaver-screensaver-bsod",
            "binary_version": "5.36-1ubuntu1"
          },
          {
            "binary_name": "xscreensaver-screensaver-webcollage",
            "binary_version": "5.36-1ubuntu1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "xscreensaver",
        "purl": "pkg:deb/ubuntu/xscreensaver@5.36-1ubuntu1?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "5.36-1ubuntu1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "xscreensaver",
            "binary_version": "5.42+dfsg1-1ubuntu1"
          },
          {
            "binary_name": "xscreensaver-data",
            "binary_version": "5.42+dfsg1-1ubuntu1"
          },
          {
            "binary_name": "xscreensaver-data-extra",
            "binary_version": "5.42+dfsg1-1ubuntu1"
          },
          {
            "binary_name": "xscreensaver-gl",
            "binary_version": "5.42+dfsg1-1ubuntu1"
          },
          {
            "binary_name": "xscreensaver-gl-extra",
            "binary_version": "5.42+dfsg1-1ubuntu1"
          },
          {
            "binary_name": "xscreensaver-screensaver-bsod",
            "binary_version": "5.42+dfsg1-1ubuntu1"
          },
          {
            "binary_name": "xscreensaver-screensaver-webcollage",
            "binary_version": "5.42+dfsg1-1ubuntu1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "xscreensaver",
        "purl": "pkg:deb/ubuntu/xscreensaver@5.42+dfsg1-1ubuntu1?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "5.42+dfsg1-1ubuntu1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "xscreensaver",
            "binary_version": "5.45+dfsg1-2ubuntu1"
          },
          {
            "binary_name": "xscreensaver-data",
            "binary_version": "5.45+dfsg1-2ubuntu1"
          },
          {
            "binary_name": "xscreensaver-data-extra",
            "binary_version": "5.45+dfsg1-2ubuntu1"
          },
          {
            "binary_name": "xscreensaver-gl",
            "binary_version": "5.45+dfsg1-2ubuntu1"
          },
          {
            "binary_name": "xscreensaver-gl-extra",
            "binary_version": "5.45+dfsg1-2ubuntu1"
          },
          {
            "binary_name": "xscreensaver-screensaver-bsod",
            "binary_version": "5.45+dfsg1-2ubuntu1"
          },
          {
            "binary_name": "xscreensaver-screensaver-webcollage",
            "binary_version": "5.45+dfsg1-2ubuntu1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "xscreensaver",
        "purl": "pkg:deb/ubuntu/xscreensaver@5.45+dfsg1-2ubuntu1?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "5.45+dfsg1-2ubuntu1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "xscreensaver",
            "binary_version": "6.08+dfsg1-1ubuntu3"
          },
          {
            "binary_name": "xscreensaver-data",
            "binary_version": "6.08+dfsg1-1ubuntu3"
          },
          {
            "binary_name": "xscreensaver-data-extra",
            "binary_version": "6.08+dfsg1-1ubuntu3"
          },
          {
            "binary_name": "xscreensaver-gl",
            "binary_version": "6.08+dfsg1-1ubuntu3"
          },
          {
            "binary_name": "xscreensaver-gl-extra",
            "binary_version": "6.08+dfsg1-1ubuntu3"
          },
          {
            "binary_name": "xscreensaver-screensaver-bsod",
            "binary_version": "6.08+dfsg1-1ubuntu3"
          },
          {
            "binary_name": "xscreensaver-screensaver-webcollage",
            "binary_version": "6.08+dfsg1-1ubuntu3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "xscreensaver",
        "purl": "pkg:deb/ubuntu/xscreensaver@6.08+dfsg1-1ubuntu3?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "6.02+dfsg1-2ubuntu2",
        "6.06+dfsg1-3ubuntu1",
        "6.08+dfsg1-1ubuntu1",
        "6.08+dfsg1-1ubuntu2",
        "6.08+dfsg1-1ubuntu3"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "xscreensaver",
            "binary_version": "6.08+dfsg1-1ubuntu4"
          },
          {
            "binary_name": "xscreensaver-data",
            "binary_version": "6.08+dfsg1-1ubuntu4"
          },
          {
            "binary_name": "xscreensaver-data-extra",
            "binary_version": "6.08+dfsg1-1ubuntu4"
          },
          {
            "binary_name": "xscreensaver-gl",
            "binary_version": "6.08+dfsg1-1ubuntu4"
          },
          {
            "binary_name": "xscreensaver-gl-extra",
            "binary_version": "6.08+dfsg1-1ubuntu4"
          },
          {
            "binary_name": "xscreensaver-screensaver-bsod",
            "binary_version": "6.08+dfsg1-1ubuntu4"
          },
          {
            "binary_name": "xscreensaver-screensaver-webcollage",
            "binary_version": "6.08+dfsg1-1ubuntu4"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:25.10",
        "name": "xscreensaver",
        "purl": "pkg:deb/ubuntu/xscreensaver@6.08+dfsg1-1ubuntu4?arch=source\u0026distro=questing"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "6.08+dfsg1-1ubuntu3",
        "6.08+dfsg1-1ubuntu4"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "xscreensaver",
            "binary_version": "6.08+dfsg1-1ubuntu5"
          },
          {
            "binary_name": "xscreensaver-data",
            "binary_version": "6.08+dfsg1-1ubuntu5"
          },
          {
            "binary_name": "xscreensaver-data-extra",
            "binary_version": "6.08+dfsg1-1ubuntu5"
          },
          {
            "binary_name": "xscreensaver-gl",
            "binary_version": "6.08+dfsg1-1ubuntu5"
          },
          {
            "binary_name": "xscreensaver-gl-extra",
            "binary_version": "6.08+dfsg1-1ubuntu5"
          },
          {
            "binary_name": "xscreensaver-screensaver-bsod",
            "binary_version": "6.08+dfsg1-1ubuntu5"
          },
          {
            "binary_name": "xscreensaver-screensaver-webcollage",
            "binary_version": "6.08+dfsg1-1ubuntu5"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "xscreensaver",
        "purl": "pkg:deb/ubuntu/xscreensaver@6.08+dfsg1-1ubuntu5?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "6.08+dfsg1-1ubuntu4",
        "6.08+dfsg1-1ubuntu5"
      ]
    }
  ],
  "aliases": [],
  "details": "The Debian xscreensaver 5.42+dfsg1-1 package for XScreenSaver has cap_net_raw enabled for the /usr/libexec/xscreensaver/sonar file, which allows local users to gain privileges because this is arguably incompatible with the design of the Mesa 3D Graphics library dependency.",
  "id": "UBUNTU-CVE-2021-31523",
  "modified": "2026-05-20T14:53:19Z",
  "published": "2021-04-21T19:15:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-31523"
    },
    {
      "type": "REPORT",
      "url": "https://www.openwall.com/lists/oss-security/2021/04/17/1"
    },
    {
      "type": "REPORT",
      "url": "https://bugs.chromium.org/p/project-zero/issues/detail?id=2174"
    },
    {
      "type": "REPORT",
      "url": "http://www.openwall.com/lists/oss-security/2021/04/21/3"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2021-31523"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2021-31523"
  ]
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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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.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.