ubuntu-cve-2020-35512
Vulnerability from osv_ubuntu
Published
2021-02-15 17:15
Modified
2026-04-22 07:39
Summary
Details

A use-after-free flaw was found in D-Bus Development branch <= 1.13.16, dbus-1.12.x stable branch <= 1.12.18, and dbus-1.10.x and older branches <= 1.10.30 when a system has multiple usernames sharing the same UID. When a set of policy rules references these usernames, D-Bus may free some memory in the heap, which is still used by data structures necessary for the other usernames sharing the UID, possibly leading to a crash or other undefined behaviors

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)
low
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "dbus",
            "binary_version": "1.6.18-0ubuntu4.5+esm3"
          },
          {
            "binary_name": "dbus-x11",
            "binary_version": "1.6.18-0ubuntu4.5+esm3"
          },
          {
            "binary_name": "libdbus-1-3",
            "binary_version": "1.6.18-0ubuntu4.5+esm3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:14.04:LTS",
        "name": "dbus",
        "purl": "pkg:deb/ubuntu/dbus@1.6.18-0ubuntu4.5+esm3?arch=source\u0026distro=esm-infra-legacy/trusty"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.6.12-0ubuntu10",
        "1.6.18-0ubuntu1",
        "1.6.18-0ubuntu2",
        "1.6.18-0ubuntu3",
        "1.6.18-0ubuntu4",
        "1.6.18-0ubuntu4.1",
        "1.6.18-0ubuntu4.2",
        "1.6.18-0ubuntu4.3",
        "1.6.18-0ubuntu4.4",
        "1.6.18-0ubuntu4.5",
        "1.6.18-0ubuntu4.5+esm1",
        "1.6.18-0ubuntu4.5+esm2",
        "1.6.18-0ubuntu4.5+esm3"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "dbus",
            "binary_version": "1.10.6-1ubuntu3.6+esm1"
          },
          {
            "binary_name": "dbus-tests",
            "binary_version": "1.10.6-1ubuntu3.6+esm1"
          },
          {
            "binary_name": "dbus-user-session",
            "binary_version": "1.10.6-1ubuntu3.6+esm1"
          },
          {
            "binary_name": "dbus-x11",
            "binary_version": "1.10.6-1ubuntu3.6+esm1"
          },
          {
            "binary_name": "libdbus-1-3",
            "binary_version": "1.10.6-1ubuntu3.6+esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:16.04:LTS",
        "name": "dbus",
        "purl": "pkg:deb/ubuntu/dbus@1.10.6-1ubuntu3.6+esm1?arch=source\u0026distro=esm-infra/xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.10.6-1ubuntu3.6+esm1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.10.0-1ubuntu1",
        "1.10.4-1ubuntu2",
        "1.10.6-1ubuntu1",
        "1.10.6-1ubuntu2",
        "1.10.6-1ubuntu3",
        "1.10.6-1ubuntu3.1",
        "1.10.6-1ubuntu3.3",
        "1.10.6-1ubuntu3.4",
        "1.10.6-1ubuntu3.5",
        "1.10.6-1ubuntu3.6"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "dbus",
            "binary_version": "1.12.2-1ubuntu1.3"
          },
          {
            "binary_name": "dbus-tests",
            "binary_version": "1.12.2-1ubuntu1.3"
          },
          {
            "binary_name": "dbus-user-session",
            "binary_version": "1.12.2-1ubuntu1.3"
          },
          {
            "binary_name": "dbus-x11",
            "binary_version": "1.12.2-1ubuntu1.3"
          },
          {
            "binary_name": "libdbus-1-3",
            "binary_version": "1.12.2-1ubuntu1.3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "dbus",
        "purl": "pkg:deb/ubuntu/dbus@1.12.2-1ubuntu1.3?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.12.2-1ubuntu1.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.10.22-1ubuntu1",
        "1.12.0-1ubuntu1",
        "1.12.2-1ubuntu1",
        "1.12.2-1ubuntu1.1",
        "1.12.2-1ubuntu1.2"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "dbus",
            "binary_version": "1.12.16-2ubuntu2.2"
          },
          {
            "binary_name": "dbus-tests",
            "binary_version": "1.12.16-2ubuntu2.2"
          },
          {
            "binary_name": "dbus-user-session",
            "binary_version": "1.12.16-2ubuntu2.2"
          },
          {
            "binary_name": "dbus-x11",
            "binary_version": "1.12.16-2ubuntu2.2"
          },
          {
            "binary_name": "libdbus-1-3",
            "binary_version": "1.12.16-2ubuntu2.2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "dbus",
        "purl": "pkg:deb/ubuntu/dbus@1.12.16-2ubuntu2.2?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.12.16-2ubuntu2.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.12.14-1ubuntu2",
        "1.12.16-2ubuntu1",
        "1.12.16-2ubuntu2",
        "1.12.16-2ubuntu2.1"
      ]
    }
  ],
  "aliases": [],
  "details": "A use-after-free flaw was found in D-Bus Development branch \u003c= 1.13.16, dbus-1.12.x stable branch \u003c= 1.12.18, and dbus-1.10.x and older branches \u003c= 1.10.30 when a system has multiple usernames sharing the same UID. When a set of policy rules references these usernames, D-Bus may free some memory in the heap, which is still used by data structures necessary for the other usernames sharing the UID, possibly leading to a crash or other undefined behaviors",
  "id": "UBUNTU-CVE-2020-35512",
  "modified": "2026-04-22T07:39:40Z",
  "published": "2021-02-15T17:15:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2020-35512"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1909101"
    },
    {
      "type": "REPORT",
      "url": "https://gitlab.freedesktop.org/dbus/dbus/-/issues/305"
    },
    {
      "type": "REPORT",
      "url": "https://gitlab.freedesktop.org/dbus/dbus/-/commit/2b7948ef907669e844b52c4fa2268d6e3162a70c"
    },
    {
      "type": "REPORT",
      "url": "https://gitlab.freedesktop.org/dbus/dbus/-/commit/f3b2574f0c9faa32a59efec905921f7ef4438a60"
    },
    {
      "type": "REPORT",
      "url": "https://gitlab.freedesktop.org/dbus/dbus/-/commit/dc94fe3d31adf72259adc31f343537151a6c0bdd"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-5244-1"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-5244-2"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2020-35512"
    }
  ],
  "related": [
    "USN-5244-1",
    "USN-5244-2"
  ],
  "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": "low",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2020-35512"
  ]
}



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