Security advisory

{
  "id": "044eacbdabcd792b0aa57c190d631ff26e39521b008e9da58fb248c84c296b70",
  "url": "https://osv.dev/vulnerability/CVE-2020-10174",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2020-10174",
    "summary": "init_tmp in TeeJee.FileSystem.vala in Timeshift before 20.03 unsafely reuses a preexisting temporary directory in the predictable location /tmp/timeshift. It follows symlinks in this location or uses directories owned by unprivileged users. Because Timeshift also executes scripts under this location, an attacker can attempt to win a race condition to replace scripts created by Timeshift with attacker-controlled scripts. Upon success, an attacker-controlled script is executed with full root privileges. This logic is practically always triggered when Timeshift runs regardless of the command-line arguments used.",
    "evidence": "osv:CVE-2020-10174",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2020-10174",
      "aliases": [
        "CVE-2020-10174"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/teejee2008/timeshift",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "cecd294dcaea9bcf282865268dc6667fbeeeddb3"
                },
                {
                  "fixed": "335b3d5398079278b8f7094c77bfd148b315b462"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:timeshift_project:timeshift:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "20.03"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "335b3d5398079278b8f7094c77bfd148b315b462"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "cecd294dcaea9bcf282865268dc6667fbeeeddb3"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v20.03"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v19.08.1",
            "v19.01",
            "v18.9.1",
            "v18.9",
            "v18.8",
            "v18.6.1",
            "v18.6",
            "v18.4",
            "v18.2",
            "v18.1.1",
            "v18.1",
            "v17.11",
            "v17.10",
            "v17.2"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-10174.json"
          }
        }
      ],
      "modified": "2026-10-20T10:51:34.584868103Z",
      "provider": "osv",
      "references": [
        "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/AAOFXT64CEUMJE3723JDJWTEQWQUCYMD/",
        "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SXDEPC52G46U6I7GLQNFLZXVSM7V2HYY/",
        "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TXXYQFSZ5P6ZMNFIDBAQKBFZIR2T7ZLL/",
        "https://github.com/teejee2008/timeshift/releases/tag/v20.03",
        "https://usn.ubuntu.com/4312-1/",
        "https://bugzilla.suse.com/show_bug.cgi?id=1165802",
        "https://github.com/teejee2008/timeshift/commit/335b3d5398079278b8f7094c77bfd148b315b462"
      ],
      "provider_metadata": {
        "unresolved_ranges": [
          {
            "cpes": [
              "cpe:2.3:o:canonical:ubuntu_linux:19.10:*:*:*:*:*:*:*"
            ],
            "vendor_product": "canonical:ubuntu_linux",
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "19.10"
                  },
                  {
                    "last_affected": "19.10"
                  }
                ],
                "source": "CPE_STRING"
              }
            ]
          },
          {
            "cpes": [
              "cpe:2.3:o:fedoraproject:fedora:30:*:*:*:*:*:*:*",
              "cpe:2.3:o:fedoraproject:fedora:31:*:*:*:*:*:*:*",
              "cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*"
            ],
            "vendor_product": "fedoraproject:fedora",
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "30"
                  },
                  {
                    "last_affected": "30"
                  },
                  {
                    "introduced": "31"
                  },
                  {
                    "last_affected": "31"
                  },
                  {
                    "introduced": "32"
                  },
                  {
                    "last_affected": "32"
                  }
                ],
                "source": "CPE_STRING"
              }
            ]
          }
        ]
      }
    },
    "related_cves": [
      {
        "value": "CVE-2020-10174",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 382585,
  "published_at": "2020-03-05T16:15:11.94+00:00"
}