CVE-2021-37705

{
  "id": "CVE-2021-37705",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 6.8,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:M/Au:N/C:P/I:P/A:P",
          "authentication": "NONE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "MEDIUM",
          "availabilityImpact": "PARTIAL",
          "confidentialityImpact": "PARTIAL"
        },
        "acInsufInfo": false,
        "impactScore": 6.4,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 8.6,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
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        "cvssData": {
          "scope": "CHANGED",
          "version": "3.1",
          "baseScore": 10,
          "attackVector": "NETWORK",
          "baseSeverity": "CRITICAL",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:L",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "LOW",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 6,
        "exploitabilityScore": 3.9
      },
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "CHANGED",
          "version": "3.1",
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          "attackVector": "NETWORK",
          "baseSeverity": "CRITICAL",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 6,
        "exploitabilityScore": 3.9
      }
    ]
  },
  "affected": [
    {
      "source": "security-advisories@github.com",
      "affectedData": [
        {
          "vendor": "microsoft",
          "product": "onefuzz",
          "versions": [
            {
              "status": "affected",
              "version": ">= 2.12.0, < 2.31.0"
            }
          ]
        }
      ]
    }
  ],
  "published": "2021-08-13T21:15:06.973",
  "references": [
    {
      "url": "https://github.com/microsoft/onefuzz/commit/2fcb4998887959b4fa11894a068d689189742cb1",
      "tags": [
        "Patch",
        "Third Party Advisory"
      ],
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    },
    {
      "url": "https://github.com/microsoft/onefuzz/pull/1153",
      "tags": [
        "Patch",
        "Third Party Advisory"
      ],
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/microsoft/onefuzz/releases/tag/2.31.0",
      "tags": [
        "Release Notes",
        "Third Party Advisory"
      ],
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/microsoft/onefuzz/security/advisories/GHSA-q5vh-6whw-x745",
      "tags": [
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      "source": "security-advisories@github.com"
    },
    {
      "url": "https://pypi.org/project/onefuzz/",
      "tags": [
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    {
      "url": "https://github.com/microsoft/onefuzz/commit/2fcb4998887959b4fa11894a068d689189742cb1",
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
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      "url": "https://github.com/microsoft/onefuzz/pull/1153",
      "tags": [
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        "Third Party Advisory"
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
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    {
      "url": "https://github.com/microsoft/onefuzz/releases/tag/2.31.0",
      "tags": [
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        "Third Party Advisory"
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
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    {
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
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      "tags": [
        "Product"
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "security-advisories@github.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-285"
        },
        {
          "lang": "en",
          "value": "CWE-346"
        }
      ]
    },
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-863"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "OneFuzz is an open source self-hosted Fuzzing-As-A-Service platform. Starting with OneFuzz 2.12.0 or greater, an incomplete authorization check allows an authenticated user from any Azure Active Directory tenant to make authorized API calls to a vulnerable OneFuzz instance. To be vulnerable, a OneFuzz deployment must be both version 2.12.0 or greater and deployed with the non-default --multi_tenant_domain option. This can result in read/write access to private data such as software vulnerability and crash information, security testing tools and proprietary code and symbols. Via authorized API calls, this also enables tampering with existing data and unauthorized code execution on Azure compute resources. This issue is resolved starting in release 2.31.0, via the addition of application-level check of the bearer token's `issuer` against an administrator-configured allowlist. As a workaround users can restrict access to the tenant of a deployed OneFuzz instance < 2.31.0 by redeploying in the default configuration, which omits the `--multi_tenant_domain` option."
    },
    {
      "lang": "es",
      "value": "OneFuzz es una plataforma de Fuzzing-As-A-Service de código abierto. A partir de la versión 2.12.0 o superior de OneFuzz, una comprobación de autorización incompleta permite a un usuario autenticado de cualquier inquilino de Azure Active Directory realizar llamadas de API autorizadas a una instancia vulnerable de OneFuzz. Para ser vulnerable, una implementación de OneFuzz debe ser ambas versión 2.12.0 o superior y estar implementada con la opción no predeterminada --multi_tenant_domain. Esto puede resultar en un acceso de lectura y escritura a datos privados, como información sobre vulnerabilidades y bloqueo de software, herramientas de pruebas de seguridad y código y símbolos propios. Por medio de llamadas autorizadas a la API, esto también habilita la manipulación de los datos existentes y una ejecución no autorizada de código en los recursos informáticos de Azure. Este problema es resuelto a partir de la versión 2.31.0, por medio de la adición de la comprobación a nivel de aplicación del \"issuer\" del token de portador con una lista de permisos configurada por el administrador. Como solución, los usuarios pueden restringir el acceso al inquilino de una instancia de OneFuzz desplegada anterior a 2.31.0 al redesplegar en la configuración predeterminada, que omite la opción \"--multi_tenant_domain\"."
    }
  ],
  "lastModified": "2026-06-17T04:01:01.420",
  "configurations": [
    {
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        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:microsoft:onefuzz:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "8F3330CA-CBB6-4DDD-8D1B-54D3099C15EC",
              "versionEndExcluding": "2.31.0",
              "versionStartIncluding": "2.12.0"
            }
          ],
          "operator": "OR"
        }
      ]
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  ],
  "sourceIdentifier": "security-advisories@github.com"
}