{
  "affected": [
    {
      "ecosystem_specific": {
        "affected_functions": [
          "cryptography.hazmat.primitives.ciphers.Cipher"
        ]
      },
      "package": {
        "ecosystem": "PyPI",
        "name": "cryptography"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "1.8"
            },
            {
              "fixed": "39.0.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2023-23931"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-754"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2023-02-07T20:54:10Z",
    "nvd_published_at": "2023-02-07T21:15:00Z",
    "severity": "MODERATE"
  },
  "details": "Previously, `Cipher.update_into` would accept Python objects which implement the buffer protocol, but provide only immutable buffers:\n\n```pycon\n\u003e\u003e\u003e outbuf = b\"\\x00\" * 32\n\u003e\u003e\u003e c = ciphers.Cipher(AES(b\"\\x00\" * 32), modes.ECB()).encryptor()\n\u003e\u003e\u003e c.update_into(b\"\\x00\" * 16, outbuf)\n16\n\u003e\u003e\u003e outbuf\nb\u0027\\xdc\\x95\\xc0x\\xa2@\\x89\\x89\\xadH\\xa2\\x14\\x92\\x84 \\x87\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\u0027\n```\n\nThis would allow immutable objects (such as `bytes`) to be mutated, thus violating fundamental rules of Python. This is a soundness bug -- it allows programmers to misuse an API, it cannot be exploited by attacker controlled data alone.\n\nThis now correctly raises an exception.\n\nThis issue has been present since `update_into` was originally introduced in cryptography 1.8.",
  "id": "GHSA-w7pp-m8wf-vj6r",
  "modified": "2024-09-13T20:07:50Z",
  "published": "2023-02-07T20:54:10Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/pyca/cryptography/security/advisories/GHSA-w7pp-m8wf-vj6r"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-23931"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pyca/cryptography/pull/8230"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pyca/cryptography/commit/d6951dca25de45abd52da51b608055371fbcde4e"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/pyca/cryptography"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pypa/advisory-database/tree/main/vulns/cryptography/PYSEC-2023-11.yaml"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Cipher.update_into can corrupt memory if passed an immutable python object as the outbuf"
}

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        "references": [
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        "title": "CVE Program Container"
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          "cvssV3_1": {
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            "attackVector": "NETWORK",
            "availabilityImpact": "LOW",
            "baseScore": 4.8,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L",
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        {
          "descriptions": [
            {
              "cweId": "CWE-754",
              "description": "CWE-754: Improper Check for Unusual or Exceptional Conditions",
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      "source": {
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    "dateReserved": "2023-01-19T21:12:31.360Z",
    "dateUpdated": "2024-08-02T10:42:27.102Z",
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