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FKIE_CVE-2021-43413

Vulnerability from fkie_nvd - Published: 2021-11-07 18:15 - Updated: 2026-06-17 04:10
Severity
8.8 (High) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
An issue was discovered in GNU Hurd before 0.9 20210404-9. A single pager port is shared among everyone who mmaps a file, allowing anyone to modify any files that they can read. This can be trivially exploited to get full root access.
References
cve@mitre.orghttps://lists.gnu.org/archive/html/bug-hurd/2002-11/msg00263.htmlMailing List, Vendor Advisory
cve@mitre.orghttps://lists.gnu.org/archive/html/bug-hurd/2005-06/msg00191.htmlMailing List, Vendor Advisory
cve@mitre.orghttps://lists.gnu.org/archive/html/bug-hurd/2021-05/msg00079.htmlExploit, Mailing List, Vendor Advisory
cve@mitre.orghttps://www.mail-archive.com/bug-hurd%40gnu.org/msg32113.html
af854a3a-2127-422b-91ae-364da2661108https://lists.gnu.org/archive/html/bug-hurd/2002-11/msg00263.htmlMailing List, Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108https://lists.gnu.org/archive/html/bug-hurd/2005-06/msg00191.htmlMailing List, Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108https://lists.gnu.org/archive/html/bug-hurd/2021-05/msg00079.htmlExploit, Mailing List, Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108https://www.mail-archive.com/bug-hurd%40gnu.org/msg32113.html
Impacted products
Vendor Product Version
gnu hurd *
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "n/a",
          "vendor": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
          ]
        }
      ],
      "source": "cve@mitre.org"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:gnu:hurd:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "F6A9E403-F3B3-4336-9A64-AEE7A1E2A0D9",
              "versionEndExcluding": "0.9.20210404-9",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "An issue was discovered in GNU Hurd before 0.9 20210404-9. A single pager port is shared among everyone who mmaps a file, allowing anyone to modify any files that they can read. This can be trivially exploited to get full root access."
    },
    {
      "lang": "es",
      "value": "Se ha detectado un problema en GNU Hurd versiones anteriores a 0.9 20210404-9. Un \u00fanico puerto de paginaci\u00f3n es compartido entre todos los que mapean un archivo, permitiendo a cualquiera modificar cualquier archivo que pueda leer. Esto puede ser explotado trivialmente para conseguir acceso completo de root"
    }
  ],
  "id": "CVE-2021-43413",
  "lastModified": "2026-06-17T04:10:56.433",
  "metrics": {
    "cvssMetricV2": [
      {
        "acInsufInfo": false,
        "baseSeverity": "HIGH",
        "cvssData": {
          "accessComplexity": "LOW",
          "accessVector": "NETWORK",
          "authentication": "SINGLE",
          "availabilityImpact": "COMPLETE",
          "baseScore": 9.0,
          "confidentialityImpact": "COMPLETE",
          "integrityImpact": "COMPLETE",
          "vectorString": "AV:N/AC:L/Au:S/C:C/I:C/A:C",
          "version": "2.0"
        },
        "exploitabilityScore": 8.0,
        "impactScore": 10.0,
        "obtainAllPrivilege": false,
        "obtainOtherPrivilege": false,
        "obtainUserPrivilege": false,
        "source": "nvd@nist.gov",
        "type": "Primary",
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 8.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 5.9,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2021-11-07T18:15:07.783",
  "references": [
    {
      "source": "cve@mitre.org",
      "tags": [
        "Mailing List",
        "Vendor Advisory"
      ],
      "url": "https://lists.gnu.org/archive/html/bug-hurd/2002-11/msg00263.html"
    },
    {
      "source": "cve@mitre.org",
      "tags": [
        "Mailing List",
        "Vendor Advisory"
      ],
      "url": "https://lists.gnu.org/archive/html/bug-hurd/2005-06/msg00191.html"
    },
    {
      "source": "cve@mitre.org",
      "tags": [
        "Exploit",
        "Mailing List",
        "Vendor Advisory"
      ],
      "url": "https://lists.gnu.org/archive/html/bug-hurd/2021-05/msg00079.html"
    },
    {
      "source": "cve@mitre.org",
      "url": "https://www.mail-archive.com/bug-hurd%40gnu.org/msg32113.html"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Mailing List",
        "Vendor Advisory"
      ],
      "url": "https://lists.gnu.org/archive/html/bug-hurd/2002-11/msg00263.html"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Mailing List",
        "Vendor Advisory"
      ],
      "url": "https://lists.gnu.org/archive/html/bug-hurd/2005-06/msg00191.html"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Exploit",
        "Mailing List",
        "Vendor Advisory"
      ],
      "url": "https://lists.gnu.org/archive/html/bug-hurd/2021-05/msg00079.html"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "url": "https://www.mail-archive.com/bug-hurd%40gnu.org/msg32113.html"
    }
  ],
  "sourceIdentifier": "cve@mitre.org",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "NVD-CWE-noinfo"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}



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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.

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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


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