fkie_cve-2024-5642
Vulnerability from fkie_nvd
Published
2024-06-27 21:15
Modified
2025-10-07 17:15
Severity ?
6.5 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L
Summary
CPython 3.9 and earlier doesn't disallow configuring an empty list ("[]") for SSLContext.set_npn_protocols() which is an invalid value for the underlying OpenSSL API. This results in a buffer over-read when NPN is used (see CVE-2024-5535 for OpenSSL). This vulnerability is of low severity due to NPN being not widely used and specifying an empty list likely being uncommon in-practice (typically a protocol name would be configured).
References
cna@python.orghttp://www.openwall.com/lists/oss-security/2024/06/28/4
cna@python.orghttps://github.com/python/cpython/commit/39258d3595300bc7b952854c915f63ae2d4b9c3e
cna@python.orghttps://github.com/python/cpython/commit/a2cdbb6e8188ba9ba8b356b28d91bff60e86fe31
cna@python.orghttps://github.com/python/cpython/issues/121227
cna@python.orghttps://github.com/python/cpython/pull/23014
cna@python.orghttps://jbp.io/2024/06/27/cve-2024-5535-openssl-memory-safety.html
cna@python.orghttps://mail.python.org/archives/list/security-announce@python.org/thread/PLP2JI3PJY33YG6P5BZYSSNU66HASXBQ/
cna@python.orghttps://security.netapp.com/advisory/ntap-20240726-0005/
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2024/06/28/4
af854a3a-2127-422b-91ae-364da2661108https://github.com/python/cpython/commit/39258d3595300bc7b952854c915f63ae2d4b9c3e
af854a3a-2127-422b-91ae-364da2661108https://github.com/python/cpython/issues/121227
af854a3a-2127-422b-91ae-364da2661108https://github.com/python/cpython/pull/23014
af854a3a-2127-422b-91ae-364da2661108https://jbp.io/2024/06/27/cve-2024-5535-openssl-memory-safety.html
af854a3a-2127-422b-91ae-364da2661108https://mail.python.org/archives/list/security-announce@python.org/thread/PLP2JI3PJY33YG6P5BZYSSNU66HASXBQ/
af854a3a-2127-422b-91ae-364da2661108https://security.netapp.com/advisory/ntap-20240726-0005/
Impacted products
Vendor Product Version


To clipboard 

{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "CPython 3.9 and earlier doesn\u0027t disallow configuring an empty list (\"[]\") for SSLContext.set_npn_protocols() which is an invalid value for the underlying OpenSSL API. This results in a buffer over-read when NPN is used (see CVE-2024-5535 for OpenSSL). This vulnerability is of low severity due to NPN being not widely used and specifying an empty list likely being uncommon in-practice (typically a protocol name would be configured)."
    },
    {
      "lang": "es",
      "value": "CPython 3.9 y versiones anteriores no permiten la configuraci\u00f3n de una lista vac\u00eda (\"[]\") para SSLContext.set_npn_protocols(), que es un valor no v\u00e1lido para la API OpenSSL subyacente. Esto da como resultado una lectura excesiva del b\u00fafer cuando se utiliza NPN (consulte CVE-2024-5535 para OpenSSL). Esta vulnerabilidad es de baja gravedad debido a que NPN no se usa ampliamente y especificar una lista vac\u00eda probablemente sea poco com\u00fan en la pr\u00e1ctica (normalmente se configurar\u00eda un nombre de protocolo)."
    }
  ],
  "id": "CVE-2024-5642",
  "lastModified": "2025-10-07T17:15:32.573",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "LOW",
          "baseScore": 6.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "LOW",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 2.5,
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
      }
    ]
  },
  "published": "2024-06-27T21:15:16.070",
  "references": [
    {
      "source": "cna@python.org",
      "url": "http://www.openwall.com/lists/oss-security/2024/06/28/4"
    },
    {
      "source": "cna@python.org",
      "url": "https://github.com/python/cpython/commit/39258d3595300bc7b952854c915f63ae2d4b9c3e"
    },
    {
      "source": "cna@python.org",
      "url": "https://github.com/python/cpython/commit/a2cdbb6e8188ba9ba8b356b28d91bff60e86fe31"
    },
    {
      "source": "cna@python.org",
      "url": "https://github.com/python/cpython/issues/121227"
    },
    {
      "source": "cna@python.org",
      "url": "https://github.com/python/cpython/pull/23014"
    },
    {
      "source": "cna@python.org",
      "url": "https://jbp.io/2024/06/27/cve-2024-5535-openssl-memory-safety.html"
    },
    {
      "source": "cna@python.org",
      "url": "https://mail.python.org/archives/list/security-announce@python.org/thread/PLP2JI3PJY33YG6P5BZYSSNU66HASXBQ/"
    },
    {
      "source": "cna@python.org",
      "url": "https://security.netapp.com/advisory/ntap-20240726-0005/"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "url": "http://www.openwall.com/lists/oss-security/2024/06/28/4"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "url": "https://github.com/python/cpython/commit/39258d3595300bc7b952854c915f63ae2d4b9c3e"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "url": "https://github.com/python/cpython/issues/121227"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "url": "https://github.com/python/cpython/pull/23014"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "url": "https://jbp.io/2024/06/27/cve-2024-5535-openssl-memory-safety.html"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "url": "https://mail.python.org/archives/list/security-announce@python.org/thread/PLP2JI3PJY33YG6P5BZYSSNU66HASXBQ/"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "url": "https://security.netapp.com/advisory/ntap-20240726-0005/"
    }
  ],
  "sourceIdentifier": "cna@python.org",
  "vulnStatus": "Awaiting Analysis"
}


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