{
  "schema_version": "1.4.0",
  "id": "GHSA-px8h-6qxv-m22q",
  "modified": "2024-11-19T19:04:59Z",
  "published": "2023-02-15T15:37:03Z",
  "aliases": [
    "CVE-2023-23934"
  ],
  "summary": "Incorrect parsing of nameless cookies leads to __Host- cookies bypass",
  "details": "Browsers may allow \"nameless\" cookies that look like `=value` instead of `key=value`. A vulnerable browser may allow a compromised application on an adjacent subdomain to exploit this to set a cookie like `=__Host-test=bad` for another subdomain.\n\nWerkzeug <= 2.2.2 will parse the cookie `=__Host-test=bad` as `__Host-test=bad`. If a Werkzeug application is running next to a vulnerable or malicious subdomain which sets such a cookie using a vulnerable browser, the Werkzeug application will see the bad cookie value but the valid cookie key.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N"
    }
  ],
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "Werkzeug"
      },
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.2.3"
            }
          ]
        }
      ]
    }
  ],
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/pallets/werkzeug/security/advisories/GHSA-px8h-6qxv-m22q"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-23934"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pallets/werkzeug/commit/cf275f42acad1b5950c50ffe8ef58fe62cdce028"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/pallets/werkzeug"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pallets/werkzeug/releases/tag/2.2.3"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pypa/advisory-database/tree/main/vulns/werkzeug/PYSEC-2023-57.yaml"
    },
    {
      "type": "WEB",
      "url": "https://security.netapp.com/advisory/ntap-20230818-0003"
    },
    {
      "type": "WEB",
      "url": "https://www.debian.org/security/2023/dsa-5470"
    }
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-20"
    ],
    "severity": "LOW",
    "github_reviewed": true,
    "github_reviewed_at": "2023-02-15T15:37:03Z",
    "nvd_published_at": "2023-02-14T20:15:00Z"
  }
}