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CVE-2021-22038

Estado: ModificadaAlta (8.8)—

On Windows, the uninstaller binary copies itself to a fixed temporary location, which is then executed (the originally called uninstaller exits, so it does not block the installation directory). This temporary location is not randomized and does not restrict access to Administrators only so a potential attacker could plant a binary to replace the copied binary right before it gets called, thus gaining Administrator privileges (if the original uninstaller was executed as Administrator). The vulnerability only affects Windows installers.

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 (1)

Vmware — Installbuilder

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2021-22038",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 6.5,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:L/Au:S/C:P/I:P/A:P",
          "authentication": "SINGLE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "LOW",
          "availabilityImpact": "PARTIAL",
          "confidentialityImpact": "PARTIAL"
        },
        "acInsufInfo": false,
        "impactScore": 6.4,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 8,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 8.8,
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.9,
        "exploitabilityScore": 2.8
      }
    ]
  },
  "affected": [
    {
      "source": "security@vmware.com",
      "affectedData": [
        {
          "vendor": "n/a",
          "product": "VMware InstallBuilder",
          "versions": [
            {
              "status": "affected",
              "version": "All InstallBuilder versions prior to version 21.6.0"
            }
          ]
        }
      ]
    }
  ],
  "published": "2021-10-29T12:15:07.617",
  "references": [
    {
      "url": "https://blog.installbuilder.com/2021/10/installbuilder-2160-released.html",
      "tags": [
        "Release Notes",
        "Vendor Advisory"
      ],
      "source": "security@vmware.com"
    },
    {
      "url": "https://blog.installbuilder.com/2021/10/installbuilder-2160-released.html",
      "tags": [
        "Release Notes",
        "Vendor Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-330"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "On Windows, the uninstaller binary copies itself to a fixed temporary location, which is then executed (the originally called uninstaller exits, so it does not block the installation directory). This temporary location is not randomized and does not restrict access to Administrators only so a potential attacker could plant a binary to replace the copied binary right before it gets called, thus gaining Administrator privileges (if the original uninstaller was executed as Administrator). The vulnerability only affects Windows installers."
    },
    {
      "lang": "es",
      "value": "En Windows, el binario del desinstalador se copia a sí mismo en una ubicación temporal fija, que luego es ejecutada (el desinstalador originalmente llamado sale, por lo que no bloquea el directorio de instalación). Esta ubicación temporal no es aleatoria y no restringe el acceso sólo a administradores, por lo que un potencial atacante podría plantar un binario para reemplazar el binario copiado justo antes de que sea llamado, obteniendo así privilegios de administrador (si el desinstalador original fue ejecutado como administrador). La vulnerabilidad sólo afecta a los instaladores de Windows"
    }
  ],
  "lastModified": "2026-06-17T03:36:35.573",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:vmware:installbuilder:*:*:*:*:*:windows:*:*",
              "vulnerable": true,
              "matchCriteriaId": "11DF34E9-7BCA-48D3-9B1D-A146D7B34769",
              "versionEndExcluding": "21.6.0"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "security@vmware.com"
}