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      {
        "category": "summary",
        "text": "An update for python-flask is now available for Red Hat Enterprise Linux 7 Extras.\n\nRed Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.",
        "title": "Topic"
      },
      {
        "category": "general",
        "text": "Flask is a lightweight but extensible web development framework for Python based on the Werkzeug WSGI toolkit, and the Jinja 2 template engine.\n\nSecurity Fix(es):\n\n* flask: Possible disclosure of permanent session cookie due to missing Vary: Cookie header (CVE-2023-30861)\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.",
        "title": "Details"
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        "text": "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.",
        "title": "Terms of Use"
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      {
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        "summary": "https://access.redhat.com/errata/RHSA-2023:3525",
        "url": "https://access.redhat.com/errata/RHSA-2023:3525"
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        "url": "https://security.access.redhat.com/data/csaf/v2/advisories/2023/rhsa-2023_3525.json"
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    ],
    "title": "Red Hat Security Advisory: python-flask security update",
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      "id": "RHSA-2023:3525",
      "initial_release_date": "2023-06-07T07:46:53+00:00",
      "revision_history": [
        {
          "date": "2023-06-07T07:46:53+00:00",
          "number": "1",
          "summary": "Initial version"
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          "date": "2023-06-07T07:46:53+00:00",
          "number": "2",
          "summary": "Last updated version"
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  "vulnerabilities": [
    {
      "cve": "CVE-2023-30861",
      "cwe": {
        "id": "CWE-488",
        "name": "Exposure of Data Element to Wrong Session"
      },
      "discovery_date": "2023-05-09T00:00:00+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2196643"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in the Python Flask package. A cached response may contain data for one client sent by a proxy to other clients, including session cookies, resulting in the compromise of data confidentiality contained in the leak requests or cookies. This happens when the following conditions are met by the proxy\u0027s behavior regarding cookies and the application\u0027s behavior session usage:\r\n1. The caching proxy does not strip or ignore response with cookies\r\n2. The application sets a permanent session\r\n3. The application does not access or modify the session during requests\r\n4. SESSION_REFRESH_EACH_REQUEST is enabled, which is the default Flask behavior\r\n5. The application does not set the Cache-Control header to avoid being cached",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "flask: Possible disclosure of permanent session cookie due to missing Vary: Cookie header",
          "title": "Vulnerability summary"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
      ],
      "product_status": {
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        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2023-30861"
        },
        {
          "category": "external",
          "summary": "RHBZ#2196643",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2196643"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2023-30861",
          "url": "https://www.cve.org/CVERecord?id=CVE-2023-30861"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2023-30861",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-30861"
        },
        {
          "category": "external",
          "summary": "https://github.com/pallets/flask/commit/70f906c51ce49c485f1d355703e9cc3386b1cc2b",
          "url": "https://github.com/pallets/flask/commit/70f906c51ce49c485f1d355703e9cc3386b1cc2b"
        },
        {
          "category": "external",
          "summary": "https://github.com/pallets/flask/security/advisories/GHSA-m2qf-hxjv-5gpq",
          "url": "https://github.com/pallets/flask/security/advisories/GHSA-m2qf-hxjv-5gpq"
        }
      ],
      "release_date": "2023-05-05T00:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2023-06-07T07:46:53+00:00",
          "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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            "7Server-EXTRAS-7.9:python-flask-1:0.10.1-7.el7_9.src"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2023:3525"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
            "version": "3.1"
          },
          "products": [
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            "7Server-EXTRAS-7.9:python-flask-1:0.10.1-7.el7_9.src"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "flask: Possible disclosure of permanent session cookie due to missing Vary: Cookie header"
    }
  ]
}