{
  "document": {
    "aggregate_severity": {
      "text": "High"
    },
    "category": "csaf_vex",
    "csaf_version": "2.0",
    "distribution": {
      "text": "TuxCare License Agreement",
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "en",
    "notes": [
      {
        "category": "legal_disclaimer",
        "text": "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Cloud Linux Inc. and provide a link to the original.",
        "title": "Terms of Use"
      }
    ],
    "publisher": {
      "category": "vendor",
      "contact_details": "https://tuxcare.com/contact/",
      "name": "TuxCare",
      "namespace": "https://tuxcare.com/"
    },
    "references": [
      {
        "category": "self",
        "summary": "Canonical URL",
        "url": "https://security.tuxcare.com/csaf/v2/els_os/ubuntu16.04els/vex/2021/cve-2021-32803-els_os-ubuntu16_04els.json"
      }
    ],
    "title": "Security update on CVE-2021-32803",
    "tracking": {
      "current_release_date": "2025-12-23T22:15:38Z",
      "generator": {
        "date": "2025-12-23T22:15:38Z",
        "engine": {
          "name": "pyCSAF"
        }
      },
      "id": "CVE-2021-32803-ELS_OS-UBUNTU16.04ELS",
      "initial_release_date": "2021-08-03T19:15:00Z",
      "revision_history": [
        {
          "date": "2021-08-03T19:15:00Z",
          "number": "1",
          "summary": "Initial version"
        },
        {
          "date": "2025-11-29T18:17:49Z",
          "number": "2",
          "summary": "Official Publication"
        },
        {
          "date": "2025-12-23T22:15:38Z",
          "number": "3",
          "summary": "Update document"
        }
      ],
      "status": "final",
      "version": "2"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_name",
                "name": "Ubuntu 16.04",
                "product": {
                  "name": "Ubuntu 16.04",
                  "product_id": "Ubuntu-16",
                  "product_identification_helper": {
                    "cpe": "cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*"
                  }
                }
              }
            ],
            "category": "product_family",
            "name": "Ubuntu"
          }
        ],
        "category": "vendor",
        "name": "Canonical Ltd."
      },
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version",
                "name": "tar-0:1.28-2.1ubuntu0.2+tuxcare.els1.amd64",
                "product": {
                  "name": "tar-0:1.28-2.1ubuntu0.2+tuxcare.els1.amd64",
                  "product_id": "tar-0:1.28-2.1ubuntu0.2+tuxcare.els1.amd64",
                  "product_identification_helper": {
                    "purl": "pkg:deb/cloudlinux/tar@1.28-2.1ubuntu0.2%2Btuxcare.els1?arch=amd64"
                  }
                }
              },
              {
                "category": "product_version",
                "name": "tar-0:1.28-2.1ubuntu0.2+tuxcare.els2.amd64",
                "product": {
                  "name": "tar-0:1.28-2.1ubuntu0.2+tuxcare.els2.amd64",
                  "product_id": "tar-0:1.28-2.1ubuntu0.2+tuxcare.els2.amd64",
                  "product_identification_helper": {
                    "purl": "pkg:deb/cloudlinux/tar@1.28-2.1ubuntu0.2%2Btuxcare.els2?arch=amd64"
                  }
                }
              },
              {
                "category": "product_version",
                "name": "tar-scripts-0:1.28-2.1ubuntu0.2+tuxcare.els2.amd64",
                "product": {
                  "name": "tar-scripts-0:1.28-2.1ubuntu0.2+tuxcare.els2.amd64",
                  "product_id": "tar-scripts-0:1.28-2.1ubuntu0.2+tuxcare.els2.amd64",
                  "product_identification_helper": {
                    "purl": "pkg:deb/cloudlinux/tar-scripts@1.28-2.1ubuntu0.2%2Btuxcare.els2?arch=amd64"
                  }
                }
              }
            ],
            "category": "architecture",
            "name": "amd64"
          }
        ],
        "category": "vendor",
        "name": "CloudLinux"
      }
    ],
    "relationships": [
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "tar-0:1.28-2.1ubuntu0.2+tuxcare.els1.amd64 as a component of Ubuntu 16.04",
          "product_id": "Ubuntu-16:tar-0:1.28-2.1ubuntu0.2+tuxcare.els1.amd64"
        },
        "product_reference": "tar-0:1.28-2.1ubuntu0.2+tuxcare.els1.amd64",
        "relates_to_product_reference": "Ubuntu-16"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "tar-0:1.28-2.1ubuntu0.2+tuxcare.els2.amd64 as a component of Ubuntu 16.04",
          "product_id": "Ubuntu-16:tar-0:1.28-2.1ubuntu0.2+tuxcare.els2.amd64"
        },
        "product_reference": "tar-0:1.28-2.1ubuntu0.2+tuxcare.els2.amd64",
        "relates_to_product_reference": "Ubuntu-16"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "tar-scripts-0:1.28-2.1ubuntu0.2+tuxcare.els2.amd64 as a component of Ubuntu 16.04",
          "product_id": "Ubuntu-16:tar-scripts-0:1.28-2.1ubuntu0.2+tuxcare.els2.amd64"
        },
        "product_reference": "tar-scripts-0:1.28-2.1ubuntu0.2+tuxcare.els2.amd64",
        "relates_to_product_reference": "Ubuntu-16"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2021-32803",
      "cwe": {
        "id": "CWE-22",
        "name": "Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')"
      },
      "notes": [
        {
          "category": "description",
          "text": "The npm package \"tar\" (aka node-tar) before versions 6.1.2, 5.0.7, 4.4.15, and 3.2.3 has an arbitrary File Creation/Overwrite vulnerability via insufficient symlink protection. `node-tar` aims to guarantee that any file whose location would be modified by a symbolic link is not extracted. This is, in part, achieved by ensuring that extracted directories are not symlinks. Additionally, in order to prevent unnecessary `stat` calls to determine whether a given path is a directory, paths are cached when directories are created. This logic was insufficient when extracting tar files that contained both a directory and a symlink with the same name as the directory. This order of operations resulted in the directory being created and added to the `node-tar` directory cache. When a directory is present in the directory cache, subsequent calls to mkdir for that directory are skipped. However, this is also where `node-tar` checks for symlinks occur. By first creating a directory, and then replacing that directory with a symlink, it was thus possible to bypass `node-tar` symlink checks on directories, essentially allowing an untrusted tar file to symlink into an arbitrary location and subsequently extracting arbitrary files into that location, thus allowing arbitrary file creation and overwrite. This issue was addressed in releases 3.2.3, 4.4.15, 5.0.7 and 6.1.2.",
          "title": "Vulnerability description"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        },
        {
          "category": "other",
          "text": "TuxCare has assessed that this vulnerability does not impact any currently supported TuxCare products. This evaluation may change as new information becomes available. For additional details regarding this vulnerability and affected products, refer to the provided references.",
          "title": "Statement"
        }
      ],
      "product_status": {
        "known_not_affected": [
          "Ubuntu-16:tar-0:1.28-2.1ubuntu0.2+tuxcare.els1.amd64",
          "Ubuntu-16:tar-0:1.28-2.1ubuntu0.2+tuxcare.els2.amd64",
          "Ubuntu-16:tar-scripts-0:1.28-2.1ubuntu0.2+tuxcare.els2.amd64"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://cve.tuxcare.com/els/cve/CVE-2021-32803"
        },
        {
          "category": "external",
          "summary": "https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf",
          "url": "https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf"
        },
        {
          "category": "external",
          "summary": "https://github.com/npm/node-tar/commit/9dbdeb6df8e9dbd96fa9e84341b9d74734be6c20",
          "url": "https://github.com/npm/node-tar/commit/9dbdeb6df8e9dbd96fa9e84341b9d74734be6c20"
        },
        {
          "category": "external",
          "summary": "https://github.com/npm/node-tar/security/advisories/GHSA-r628-mhmh-qjhw",
          "url": "https://github.com/npm/node-tar/security/advisories/GHSA-r628-mhmh-qjhw"
        },
        {
          "category": "external",
          "summary": "https://www.npmjs.com/advisories/1771",
          "url": "https://www.npmjs.com/advisories/1771"
        },
        {
          "category": "external",
          "summary": "https://www.npmjs.com/package/tar",
          "url": "https://www.npmjs.com/package/tar"
        },
        {
          "category": "external",
          "summary": "https://www.oracle.com/security-alerts/cpuoct2021.html",
          "url": "https://www.oracle.com/security-alerts/cpuoct2021.html"
        }
      ],
      "release_date": "2021-08-03T19:15:00Z",
      "scores": [
        {
          "cvss_v2": {
            "accessComplexity": "MEDIUM",
            "accessVector": "NETWORK",
            "authentication": "NONE",
            "availabilityImpact": "PARTIAL",
            "baseScore": 5.8,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "PARTIAL",
            "vectorString": "AV:N/AC:M/Au:N/C:N/I:P/A:P",
            "version": "2.0"
          },
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 8.1,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H",
            "version": "3.1"
          },
          "products": [
            "Ubuntu-16:tar-0:1.28-2.1ubuntu0.2+tuxcare.els1.amd64",
            "Ubuntu-16:tar-0:1.28-2.1ubuntu0.2+tuxcare.els2.amd64",
            "Ubuntu-16:tar-scripts-0:1.28-2.1ubuntu0.2+tuxcare.els2.amd64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        },
        {
          "category": "impact",
          "details": "important",
          "product_ids": [
            "Ubuntu-16:tar-0:1.28-2.1ubuntu0.2+tuxcare.els1.amd64",
            "Ubuntu-16:tar-0:1.28-2.1ubuntu0.2+tuxcare.els2.amd64",
            "Ubuntu-16:tar-scripts-0:1.28-2.1ubuntu0.2+tuxcare.els2.amd64"
          ]
        }
      ]
    }
  ]
}