ubuntu-cve-2023-23934
Vulnerability from osv_ubuntu
Published
2023-02-14 20:15
Modified
2025-09-08 16:56
Summary
Details

Werkzeug is a comprehensive WSGI web application library. 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 prior to 2.2.3 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. The issue is fixed in Werkzeug 2.2.3.

Severity
3.5 (Low)
CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
2.6 (Low)
CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N
N/A (UNKNOWN)
medium
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "python-werkzeug",
            "binary_version": "0.10.4+dfsg1-1ubuntu1.2+esm1"
          },
          {
            "binary_name": "python3-werkzeug",
            "binary_version": "0.10.4+dfsg1-1ubuntu1.2+esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:16.04:LTS",
        "name": "python-werkzeug",
        "purl": "pkg:deb/ubuntu/python-werkzeug@0.10.4+dfsg1-1ubuntu1.2+esm1?arch=source\u0026distro=esm-infra/xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.10.4+dfsg1-1ubuntu1.2+esm1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.10.4+dfsg1-1ubuntu1",
        "0.10.4+dfsg1-1ubuntu1.1",
        "0.10.4+dfsg1-1ubuntu1.2"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "python-werkzeug",
            "binary_version": "0.14.1+dfsg1-1ubuntu0.2"
          },
          {
            "binary_name": "python3-werkzeug",
            "binary_version": "0.14.1+dfsg1-1ubuntu0.2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "python-werkzeug",
        "purl": "pkg:deb/ubuntu/python-werkzeug@0.14.1+dfsg1-1ubuntu0.2?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.14.1+dfsg1-1ubuntu0.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.12.2+dfsg1-2",
        "0.13+dfsg1-1",
        "0.14.1+dfsg1-1",
        "0.14.1+dfsg1-1ubuntu0.1"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "python3-werkzeug",
            "binary_version": "0.16.1+dfsg1-2ubuntu0.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "python-werkzeug",
        "purl": "pkg:deb/ubuntu/python-werkzeug@0.16.1+dfsg1-2ubuntu0.1?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.16.1+dfsg1-2ubuntu0.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.14.1+dfsg1-4",
        "0.15.6+dfsg1-1",
        "0.16.0+dfsg1-1",
        "0.16.1+dfsg1-1ubuntu1",
        "0.16.1+dfsg1-2"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "python3-werkzeug",
            "binary_version": "2.0.2+dfsg1-1ubuntu0.22.04.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "python-werkzeug",
        "purl": "pkg:deb/ubuntu/python-werkzeug@2.0.2+dfsg1-1ubuntu0.22.04.1?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.0.2+dfsg1-1ubuntu0.22.04.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.0.1+dfsg1-2",
        "2.0.2+dfsg1-1"
      ]
    }
  ],
  "aliases": [],
  "details": "Werkzeug is a comprehensive WSGI web application library. 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 prior to 2.2.3 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. The issue is fixed in Werkzeug 2.2.3.",
  "id": "UBUNTU-CVE-2023-23934",
  "modified": "2025-09-08T16:56:08Z",
  "published": "2023-02-14T20:15:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2023-23934"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/pallets/werkzeug/security/advisories/GHSA-px8h-6qxv-m22q"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/pallets/werkzeug/commit/cf275f42acad1b5950c50ffe8ef58fe62cdce028"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/pallets/werkzeug/releases/tag/2.2.3"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-5948-1"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-5948-2"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2023-23934"
    }
  ],
  "related": [
    "USN-5948-1",
    "USN-5948-2"
  ],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2023-23934"
  ]
}



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