FKIE_CVE-2018-6954

Vulnerability from fkie_nvd - Published: 2018-02-13 20:29 - Updated: 2026-06-17 02:02
Severity
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
systemd-tmpfiles in systemd through 237 mishandles symlinks present in non-terminal path components, which allows local users to obtain ownership of arbitrary files via vectors involving creation of a directory and a file under that directory, and later replacing that directory with a symlink. This occurs even if the fs.protected_symlinks sysctl is turned on.
References
cve@mitre.orghttp://lists.opensuse.org/opensuse-security-announce/2019-05/msg00062.htmlThird Party Advisory
cve@mitre.orghttps://github.com/systemd/systemd/issues/7986Exploit, Issue Tracking, Patch, Third Party Advisory
cve@mitre.orghttps://lists.apache.org/thread.html/r58af02e294bd07f487e2c64ffc0a29b837db5600e33b6e698b9d696b%40%3Cissues.bookkeeper.apache.org%3E
cve@mitre.orghttps://lists.apache.org/thread.html/rf4c02775860db415b4955778a131c2795223f61cb8c6a450893651e4%40%3Cissues.bookkeeper.apache.org%3E
cve@mitre.orghttps://usn.ubuntu.com/3816-1/Third Party Advisory
cve@mitre.orghttps://usn.ubuntu.com/3816-2/Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108http://lists.opensuse.org/opensuse-security-announce/2019-05/msg00062.htmlThird Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/systemd/systemd/issues/7986Exploit, Issue Tracking, Patch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://lists.apache.org/thread.html/r58af02e294bd07f487e2c64ffc0a29b837db5600e33b6e698b9d696b%40%3Cissues.bookkeeper.apache.org%3E
af854a3a-2127-422b-91ae-364da2661108https://lists.apache.org/thread.html/rf4c02775860db415b4955778a131c2795223f61cb8c6a450893651e4%40%3Cissues.bookkeeper.apache.org%3E
af854a3a-2127-422b-91ae-364da2661108https://usn.ubuntu.com/3816-1/Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://usn.ubuntu.com/3816-2/Third Party Advisory
Impacted products
Vendor Product Version
systemd_project systemd *
canonical ubuntu_linux 16.04
canonical ubuntu_linux 18.04
canonical ubuntu_linux 18.10
opensuse leap 42.3
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "n/a",
          "vendor": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
          ]
        }
      ],
      "source": "cve@mitre.org"
    }
  ],
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  "cveTags": [],
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      "value": "systemd-tmpfiles in systemd through 237 mishandles symlinks present in non-terminal path components, which allows local users to obtain ownership of arbitrary files via vectors involving creation of a directory and a file under that directory, and later replacing that directory with a symlink. This occurs even if the fs.protected_symlinks sysctl is turned on."
    },
    {
      "lang": "es",
      "value": "systemd-tmpfiles en systemd, hasta 237, gestiona de manera incorrecta los v\u00ednculos simb\u00f3licos presentes en componentes de ruta no terminales. Esto permite que usuarios locales se hagan due\u00f1os de archivos arbitrarios mediante vectores relacionados con la creaci\u00f3n de un directorio y un archivo bajo ese directorio para, posteriormente, reemplazarlo por un v\u00ednculo simb\u00f3lico. Esto ocurre incluso aunque el sysctl fs.protected_symlinks est\u00e9 activado."
    }
  ],
  "id": "CVE-2018-6954",
  "lastModified": "2026-06-17T02:02:30.433",
  "metrics": {
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        "acInsufInfo": false,
        "baseSeverity": "HIGH",
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          "accessVector": "LOCAL",
          "authentication": "NONE",
          "availabilityImpact": "COMPLETE",
          "baseScore": 7.2,
          "confidentialityImpact": "COMPLETE",
          "integrityImpact": "COMPLETE",
          "vectorString": "AV:L/AC:L/Au:N/C:C/I:C/A:C",
          "version": "2.0"
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            {
              "technicalImpact": "total"
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          "role": "CISA Coordinator",
          "timestamp": "2025-06-09T15:53:55.273054Z",
          "version": "2.0.3"
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  },
  "published": "2018-02-13T20:29:00.547",
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    }
  ]
}



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