GHSA-PJC4-3W99-J7V4

Vulnerability from github – Published: 2021-06-15 15:56 – Updated: 2024-09-20 20:01
VLAI?
Summary
Open redirect in Flask-Unchained
Details

This affects the package Flask-Unchained before 0.9.0. When using the the _validate_redirect_url function, it is possible to bypass URL validation and redirect a user to an arbitrary URL by providing multiple back slashes such as \\evil.com/path. This vulnerability is only exploitable if an alternative WSGI server other than Werkzeug is used, or the default behaviour of Werkzeug is modified using 'autocorrect_location_header=False.

Severity ?
5.4 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
5.3 (Medium)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
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{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "Flask-Unchained"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.9.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2021-23393"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-601"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2021-06-14T19:36:47Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
  },
  "details": "This affects the package Flask-Unchained before 0.9.0. When using the the _validate_redirect_url function, it is possible to bypass URL validation and redirect a user to an arbitrary URL by providing multiple back slashes such as \\\\\\evil.com/path. This vulnerability is only exploitable if an alternative WSGI server other than Werkzeug is used, or the default behaviour of Werkzeug is modified using \u0027autocorrect_location_header=False.",
  "id": "GHSA-pjc4-3w99-j7v4",
  "modified": "2024-09-20T20:01:50Z",
  "published": "2021-06-15T15:56:59Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-23393"
    },
    {
      "type": "WEB",
      "url": "https://github.com/briancappello/flask-unchained/commit/2bfeedf1bc31df851cab8c66df0c432b10406aad"
    },
    {
      "type": "WEB",
      "url": "https://github.com/briancappello/flask-unchained/commit/71e36b28166f9ffbe0a991f51127f0984f7e6a40"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/advisories/GHSA-pjc4-3w99-j7v4"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pypa/advisory-database/tree/main/vulns/flask-unchained/PYSEC-2021-96.yaml"
    },
    {
      "type": "WEB",
      "url": "https://snyk.io/vuln/SNYK-PYTHON-FLASKUNCHAINED-1293189"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Open redirect in Flask-Unchained"
}


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