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CVE-2021-35939

Estado: ModificadaMedia (6.7)—

Se ha detectado que la corrección de CVE-2017-7500 y CVE-2017-7501 era incompleta: la comprobación sólo es implementada para el directorio padre del archivo que iba a crearse. Un usuario local no privilegiado que posea otro directorio antecesor podría usar este fallo para conseguir privilegios de root. La mayor amenaza de esta vulnerabilidad es para la confidencialidad e integridad de los datos, así como para la disponibilidad del sistema.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (2)

Redhat — Enterprise LinuxRPM — RPM

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2021-35939",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 6.7,
          "attackVector": "LOCAL",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "HIGH",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.9,
        "exploitabilityScore": 0.8
      }
    ]
  },
  "affected": [
    {
      "source": "secalert@redhat.com",
      "affectedData": [
        {
          "vendor": "n/a",
          "product": "RPM",
          "versions": [
            {
              "status": "affected",
              "version": "Fixed in RPM-v4.18"
            }
          ]
        }
      ]
    }
  ],
  "published": "2022-08-26T16:15:08.683",
  "references": [
    {
      "url": "https://access.redhat.com/security/cve/CVE-2021-35939",
      "tags": [
        "Third Party Advisory"
      ],
      "source": "secalert@redhat.com"
    },
    {
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1964129",
      "tags": [
        "Exploit",
        "Issue Tracking",
        "Third Party Advisory"
      ],
      "source": "secalert@redhat.com"
    },
    {
      "url": "https://github.com/rpm-software-management/rpm/commit/96ec957e281220f8e137a2d5eb23b83a6377d556",
      "tags": [
        "Patch",
        "Third Party Advisory"
      ],
      "source": "secalert@redhat.com"
    },
    {
      "url": "https://github.com/rpm-software-management/rpm/pull/1919",
      "tags": [
        "Patch",
        "Third Party Advisory"
      ],
      "source": "secalert@redhat.com"
    },
    {
      "url": "https://rpm.org/wiki/Releases/4.18.0",
      "tags": [
        "Release Notes",
        "Vendor Advisory"
      ],
      "source": "secalert@redhat.com"
    },
    {
      "url": "https://security.gentoo.org/glsa/202210-22",
      "tags": [
        "Third Party Advisory"
      ],
      "source": "secalert@redhat.com"
    },
    {
      "url": "https://access.redhat.com/security/cve/CVE-2021-35939",
      "tags": [
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    },
    {
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1964129",
      "tags": [
        "Exploit",
        "Issue Tracking",
        "Third Party Advisory"
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://github.com/rpm-software-management/rpm/commit/96ec957e281220f8e137a2d5eb23b83a6377d556",
      "tags": [
        "Patch",
        "Third Party Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://github.com/rpm-software-management/rpm/pull/1919",
      "tags": [
        "Patch",
        "Third Party Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://rpm.org/wiki/Releases/4.18.0",
      "tags": [
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        "Vendor Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://security.gentoo.org/glsa/202210-22",
      "tags": [
        "Third Party Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "secalert@redhat.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-59"
        }
      ]
    },
    {
      "type": "Secondary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-59"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "It was found that the fix for CVE-2017-7500 and CVE-2017-7501 was incomplete: the check was only implemented for the parent directory of the file to be created. A local unprivileged user who owns another ancestor directory could potentially use this flaw to gain root privileges. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability."
    },
    {
      "lang": "es",
      "value": "Se ha detectado que la corrección de CVE-2017-7500 y CVE-2017-7501 era incompleta: la comprobación sólo es implementada para el directorio padre del archivo que iba a crearse. Un usuario local no privilegiado que posea otro directorio antecesor podría usar este fallo para conseguir privilegios de root. La mayor amenaza de esta vulnerabilidad es para la confidencialidad e integridad de los datos, así como para la disponibilidad del sistema."
    }
  ],
  "lastModified": "2026-06-17T03:57:57.940",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
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              "vulnerable": true,
              "matchCriteriaId": "582D14B9-3812-42FD-9FA3-2BDEAA02DD6C",
              "versionEndExcluding": "4.18"
            }
          ],
          "operator": "OR"
        }
      ]
    },
    {
      "nodes": [
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            }
          ],
          "operator": "OR"
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  ],
  "sourceIdentifier": "secalert@redhat.com"
}