Security advisory

{
  "id": "2c48ff4743323d4ce693745cfed7973613d87a07cb703a28c62fa2800514268c",
  "url": "https://osv.dev/vulnerability/CVE-2017-8900",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2017-8900",
    "summary": "LightDM through 1.22.0, when systemd is used in Ubuntu 16.10 and 17.x, allows physically proximate attackers to bypass intended AppArmor restrictions and visit the home directories of arbitrary users by establishing a guest session.",
    "evidence": "osv:CVE-2017-8900",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2017-8900",
      "aliases": [
        "CVE-2017-8900"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.0/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/ubuntu/lightdm",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "86c6734caf7dc2be62a2376e9b1c8a704b681875"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:lightdm_project:lightdm:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "1.22.0"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "1.22.0",
            "1.21.5",
            "1.21.4",
            "1.21.3",
            "1.21.2",
            "1.21.1-0ubuntu2",
            "1.21.1",
            "1.21.0",
            "1.20.0-0ubuntu2",
            "1.20.0",
            "1.19.5",
            "1.19.4",
            "1.19.3",
            "1.19.2",
            "1.19.1",
            "1.19.0",
            "1.18.0",
            "1.17.6",
            "1.17.5-0ubuntu2",
            "1.17.5",
            "1.17.4",
            "1.17.3",
            "1.17.2",
            "1.17.1",
            "1.17.0",
            "1.16.0",
            "1.15.3",
            "1.15.2",
            "1.15.1",
            "1.15.0",
            "1.14.0",
            "1.14.0-0ubuntu2",
            "1.13.2",
            "1.13.1",
            "1.13.0",
            "1.12.0",
            "1.11.9",
            "1.11.8",
            "1.11.7",
            "1.11.6",
            "1.11.5",
            "1.11.4",
            "1.11.3",
            "1.11.2",
            "1.11.1",
            "1.11.0",
            "1.10.0",
            "1.9.14",
            "1.9.13",
            "1.9.12",
            "1.9.11",
            "1.9.10",
            "1.9.9",
            "1.9.8",
            "1.9.6-0ubuntu4",
            "1.9.7",
            "1.9.6",
            "1.9.5",
            "1.9.4",
            "1.9.3",
            "1.9.2",
            "1.9.1",
            "1.9.0",
            "1.8.0",
            "1.7.18",
            "1.7.17",
            "1.7.16",
            "1.7.15-0ubuntu1",
            "1.7.15",
            "1.7.14",
            "1.7.13",
            "1.7.12",
            "1.7.11",
            "1.7.10",
            "1.7.9",
            "1.7.8",
            "1.7.7",
            "1.7.6",
            "1.7.5",
            "1.7.4",
            "1.7.3",
            "1.7.2",
            "1.7.1",
            "1.7.0",
            "1.6.0",
            "1.5.3",
            "1.5.2",
            "1.5.1",
            "1.4.0",
            "1.5.0",
            "1.3.3",
            "1.3.2",
            "1.3.1",
            "1.2.1",
            "1.2.0",
            "1.1.9",
            "1.1.8",
            "1.1.7",
            "1.1.6",
            "lightdm-1.1.5",
            "1.1.5",
            "1.1.4",
            "1.1.3",
            "1.1.2",
            "1.1.1",
            "lightdm-1.1.0",
            "lightdm-1.0.0",
            "lightdm-0.9.8",
            "lightdm-0.9.7",
            "lightdm-0.9.6",
            "lightdm-0.9.5",
            "lightdm-0.9.4",
            "lightdm-0.9.3",
            "lightdm-0.9.1",
            "lightdm-0.9.0",
            "lightdm-0.4.4",
            "lightdm-0.4.3.real",
            "lightdm-0.4.3",
            "lightdm-0.4.2",
            "lightdm-0.4.1",
            "lightdm-0.4.0",
            "lightdm-0.3.7",
            "lightdm-0.3.6",
            "lightdm-0.3.5",
            "lightdm-0.3.4",
            "lightdm-0.3.3",
            "lightdm-0.3.2",
            "lightdm-0.3.1",
            "lightdm-0.3.0",
            "lightdm-0.2.3",
            "lightdm-0.2.2",
            "lightdm-0.2.1",
            "lightdm-0.2.0",
            "lightdm-0.1.2",
            "lightdm-0.1.1",
            "lightdm-0.1.0",
            "lightdm-0.0.4",
            "lightdm-0.0.3",
            "lightdm-0.0.2",
            "lightdm-0.0.1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2017-8900.json"
          }
        }
      ],
      "modified": "2026-10-24T10:30:42.289237178Z",
      "provider": "osv",
      "references": [
        "https://launchpad.net/bugs/1663157",
        "https://people.canonical.com/~ubuntu-security/cve/2017/CVE-2017-8900.html",
        "https://www.ubuntu.com/usn/usn-3285-1/"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2017-8900",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 435338,
  "published_at": "2017-05-12T07:29:00.233+00:00"
}