CVE-2021-32804 (GCVE-0-2021-32804)

Vulnerability from cvelistv5 – Published: 2021-08-03 19:10 – Updated: 2024-08-03 23:33
VLAI
Title
Arbitrary File Creation/Overwrite due to insufficient absolute path sanitization
Summary
The npm package "tar" (aka node-tar) before versions 6.1.1, 5.0.6, 4.4.14, and 3.3.2 has a arbitrary File Creation/Overwrite vulnerability due to insufficient absolute path sanitization. node-tar aims to prevent extraction of absolute file paths by turning absolute paths into relative paths when the `preservePaths` flag is not set to `true`. This is achieved by stripping the absolute path root from any absolute file paths contained in a tar file. For example `/home/user/.bashrc` would turn into `home/user/.bashrc`. This logic was insufficient when file paths contained repeated path roots such as `////home/user/.bashrc`. `node-tar` would only strip a single path root from such paths. When given an absolute file path with repeating path roots, the resulting path (e.g. `///home/user/.bashrc`) would still resolve to an absolute path, thus allowing arbitrary file creation and overwrite. This issue was addressed in releases 3.2.2, 4.4.14, 5.0.6 and 6.1.1. Users may work around this vulnerability without upgrading by creating a custom `onentry` method which sanitizes the `entry.path` or a `filter` method which removes entries with absolute paths. See referenced GitHub Advisory for details. Be aware of CVE-2021-32803 which fixes a similar bug in later versions of tar.
Severity
8.2 (High)
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N
CWE
  • CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Assigner
GitHub_M CNA under the mitre root
CNA scorecard C 72/100 over 7886 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
npm node-tar Affected: < 3.2.2
Affected: >= 4.0.0, < 4.4.14
Affected: >= 5.0.0, < 5.0.6
Affected: >= 6.0.0, < 6.1.1
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Show details on NVD website
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      "vulnStatus": "Modified",
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          "type": "Secondary"
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              "value": "CWE-22"
            }
          ],
          "source": "nvd@nist.gov",
          "type": "Primary"
        }
      ]
    },
    "nvd": {
      "cve": {
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        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "The npm package \"tar\" (aka node-tar) before versions 6.1.1, 5.0.6, 4.4.14, and 3.3.2 has a arbitrary File Creation/Overwrite vulnerability due to insufficient absolute path sanitization. node-tar aims to prevent extraction of absolute file paths by turning absolute paths into relative paths when the `preservePaths` flag is not set to `true`. This is achieved by stripping the absolute path root from any absolute file paths contained in a tar file. For example `/home/user/.bashrc` would turn into `home/user/.bashrc`. This logic was insufficient when file paths contained repeated path roots such as `////home/user/.bashrc`. `node-tar` would only strip a single path root from such paths. When given an absolute file path with repeating path roots, the resulting path (e.g. `///home/user/.bashrc`) would still resolve to an absolute path, thus allowing arbitrary file creation and overwrite. This issue was addressed in releases 3.2.2, 4.4.14, 5.0.6 and 6.1.1. Users may work around this vulnerability without upgrading by creating a custom `onentry` method which sanitizes the `entry.path` or a `filter` method which removes entries with absolute paths. See referenced GitHub Advisory for details. Be aware of CVE-2021-32803 which fixes a similar bug in later versions of tar."
          },
          {
            "lang": "es",
            "value": "El paquete npm \"tar\" (tambi\u00e9n se conoce como node-tar) versiones anteriores a 6.1.1, 5.0.6, 4.4.14 y 3.3.2, presenta una vulnerabilidad de Creaci\u00f3n y Sobrescritura de archivos arbitraria debido a un saneo insuficiente de rutas absolutas. node-tar pretende impedir la extracci\u00f3n de rutas absolutas de archivos al convertir las rutas absolutas en relativas cuando el flag \"preservePaths\" no est\u00e1 establecido en \"true\". Esto se consigue eliminando el root de la ruta absoluta de cualquier ruta de archivo absoluta contenida en un archivo tar. Por ejemplo, \"home/user/.bashrc\" se convertir\u00eda en \"home/user/.bashrc\". Esta l\u00f3gica era insuficiente cuando las rutas de los archivos conten\u00edan roots de ruta repetidas, como \"////home/user/.bashrc\". \"node-tar\" s\u00f3lo eliminaba un \u00fanico root de esas rutas. Cuando se daba una ruta de archivo absoluta con ra\u00edces de ruta repetidas, la ruta resultante (por ejemplo, \"///home/user/.bashrc\") segu\u00eda resolvi\u00e9ndose como una ruta absoluta, permitiendo as\u00ed la creaci\u00f3n y sobrescritura de archivos arbitraria. Este problema se ha solucionado en las versiones 3.2.2, 4.4.14, 5.0.6 y 6.1.1. Los usuarios pueden solucionar esta vulnerabilidad sin necesidad de actualizar al crear un m\u00e9todo personalizado \"onentry\" que sanee \"entry.path\" o un m\u00e9todo \"filter\" que elimine las entradas con rutas absolutas. Consulte el aviso de GitHub mencionado para obtener m\u00e1s detalles. Tenga en cuenta CVE-2021-32803 que corrige un error similar en versiones posteriores de tar"
          }
        ],
        "id": "CVE-2021-32804",
        "lastModified": "2024-11-21T06:07:46.800",
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              "baseSeverity": "MEDIUM",
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                "accessVector": "NETWORK",
                "authentication": "NONE",
                "availabilityImpact": "PARTIAL",
                "baseScore": 5.8,
                "confidentialityImpact": "NONE",
                "integrityImpact": "PARTIAL",
                "vectorString": "AV:N/AC:M/Au:N/C:N/I:P/A:P",
                "version": "2.0"
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                "scope": "CHANGED",
                "userInteraction": "REQUIRED",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N",
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    "redhat_vex": {
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      "current_release_date": "2026-11-07T13:22:37+00:00",
      "cve": "CVE-2021-32804",
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      "initial_release_date": "2021-08-03T00:00:00+00:00",
      "product_status:fixed": "239",
      "product_status:known_affected": "15",
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      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "nodejs-tar: Insufficient absolute path sanitization allowing arbitrary file creation and overwrite",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-32804.json",
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      "cve": "CVE-2021-32804",
      "id": "CVE-2021-32804",
      "initial_release_date": "2023-02-15T03:40:45Z",
      "product_status:known_not_affected": "164",
      "product_status:recommended": "551",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2021-32804",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2021-32804.json",
      "version": "13"
    }
  }
}



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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

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.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • 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.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON
How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

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    Related by attack behaviour

    Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.