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CVE-2020-5217

Estado: ModificadaMedia (5.8)—

In Secure Headers (RubyGem secure_headers), a directive injection vulnerability is present in versions before 3.8.0, 5.1.0, and 6.2.0. If user-supplied input was passed into append/override_content_security_policy_directives, a semicolon could be injected leading to directive injection. This could be used to e.g. override a script-src directive. Duplicate directives are ignored and the first one wins. The directives in secure_headers are sorted alphabetically so they pretty much all come before script-src.

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A previously undefined directive would receive a value even if SecureHeaders::OPT_OUT was supplied. The fixed versions will silently convert the semicolons to spaces and emit a deprecation warning when this happens. This will result in innocuous browser console messages if being exploited/accidentally used. In future releases, we will raise application errors resulting in 500s. Depending on what major version you are using, the fixed versions are 6.2.0, 5.1.0, 3.8.0.

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).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

Fuente: mapeo oficial MITRE CTID (CVE → ATT&CK).

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

User TrainingUser Account ManagementRestrict Web-Based ContentPrivileged Account ManagementLimit Software InstallationExecution Prevention

Tecnologías afectadas (1)

Twitter — Secure Headers

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2020-5217",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 5,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:L/Au:N/C:N/I:P/A:N",
          "authentication": "NONE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "LOW",
          "availabilityImpact": "NONE",
          "confidentialityImpact": "NONE"
        },
        "acInsufInfo": false,
        "impactScore": 2.9,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 10,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
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        "cvssData": {
          "scope": "CHANGED",
          "version": "3.1",
          "baseScore": 4.4,
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:N",
          "integrityImpact": "LOW",
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          "attackComplexity": "HIGH",
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        "exploitabilityScore": 1.3
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          "integrityImpact": "LOW",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 1.4,
        "exploitabilityScore": 3.9
      }
    ]
  },
  "affected": [
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      "source": "security-advisories@github.com",
      "affectedData": [
        {
          "vendor": "Twitter",
          "product": "secure_headers",
          "versions": [
            {
              "status": "affected",
              "version": "< 3.8.0"
            },
            {
              "status": "affected",
              "version": ">= 5.0.0, < 5.1.0"
            },
            {
              "status": "affected",
              "version": ">= 6.0.0, < 6.2.0"
            }
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  "published": "2020-01-23T03:15:10.793",
  "references": [
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      "tags": [
        "Patch"
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      "tags": [
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        "Third Party Advisory"
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      "url": "https://github.com/twitter/secure_headers/pull/421",
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        "Third Party Advisory"
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      "tags": [
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      "tags": [
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
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  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "security-advisories@github.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-95"
        }
      ]
    },
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-74"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In Secure Headers (RubyGem secure_headers), a directive injection vulnerability is present in versions before 3.8.0, 5.1.0, and 6.2.0. If user-supplied input was passed into append/override_content_security_policy_directives, a semicolon could be injected leading to directive injection. This could be used to e.g. override a script-src directive. Duplicate directives are ignored and the first one wins. The directives in secure_headers are sorted alphabetically so they pretty much all come before script-src. A previously undefined directive would receive a value even if SecureHeaders::OPT_OUT was supplied. The fixed versions will silently convert the semicolons to spaces and emit a deprecation warning when this happens. This will result in innocuous browser console messages if being exploited/accidentally used. In future releases, we will raise application errors resulting in 500s. Depending on what major version you are using, the fixed versions are 6.2.0, 5.1.0, 3.8.0."
    },
    {
      "lang": "es",
      "value": "En Secure Headers (secure_headers de RubyGem), una vulnerabilidad de inyección de directiva está presente en las versiones anteriores a 3.8.0, 5.1.0 y 6.2.0. Si una entrada suministrada por el usuario fue pasada a append/override_content_security_policy_directives, se podría inyectar un punto y coma conllevando a una inyección de directiva. Esto podría ser usado para, por ejemplo anular una directiva script-src. Las directivas duplicadas son ignoradas y la primera gana. Las directivas en secure_headers están ordenadas alfabéticamente, por lo que casi todas van antes de script-src. Una directiva previamente indefinida recibiría un valor inclusive si la función SecureHeaders::OPT_OUT fue suministrada. Las versiones corregidas convertirán silenciosamente los puntos y comas en espacios y emitirán una advertencia de desaprobación cuando esto suceda. Esto resultará en mensajes inocuos de la consola del navegador si está siendo explotada o usada accidentalmente. En futuras versiones, generaremos errores de aplicación resultando en 500. Según la versión principal que esté usando, las versiones corregidas son 6.2.0, 5.1.0, 3.8.0."
    }
  ],
  "lastModified": "2026-06-17T03:21:02.700",
  "configurations": [
    {
      "nodes": [
        {
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}