ghsa-px8h-6qxv-m22q
Vulnerability from github
Published
2023-02-15 15:37
Modified
2023-02-15 15:37
Severity ?
2.6 (Low) - CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N
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.

Werkzeug <= 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.

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{
  "affected": [
    {
      "ecosystem_specific": {
        "affected_functions": [
          "werkzeug.http.parse_cookie"
        ]
      },
      "package": {
        "ecosystem": "PyPI",
        "name": "Werkzeug"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.2.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2023-23934"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-20"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2023-02-15T15:37:03Z",
    "nvd_published_at": "2023-02-14T20:15:00Z",
    "severity": "LOW"
  },
  "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 \u003c= 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.",
  "id": "GHSA-px8h-6qxv-m22q",
  "modified": "2023-02-15T15:37:03Z",
  "published": "2023-02-15T15:37:03Z",
  "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://security.netapp.com/advisory/ntap-20230818-0003"
    },
    {
      "type": "WEB",
      "url": "https://www.debian.org/security/2023/dsa-5470"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Incorrect parsing of nameless cookies leads to __Host- cookies bypass"
}


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