GHSA-V845-JXX5-VC9F

Vulnerability from github – Published: 2023-10-02 23:27 – Updated: 2025-11-04 16:45
VLAI?
Summary
`Cookie` HTTP header isn't stripped on cross-origin redirects
Details

urllib3 doesn't treat the Cookie HTTP header special or provide any helpers for managing cookies over HTTP, that is the responsibility of the user. However, it is possible for a user to specify a Cookie header and unknowingly leak information via HTTP redirects to a different origin if that user doesn't disable redirects explicitly.

Users must handle redirects themselves instead of relying on urllib3's automatic redirects to achieve safe processing of the Cookie header, thus we decided to strip the header by default in order to further protect users who aren't using the correct approach.

Affected usages

We believe the number of usages affected by this advisory is low. It requires all of the following to be true to be exploited:

  • Using an affected version of urllib3 (patched in v1.26.17 and v2.0.6)
  • Using the Cookie header on requests, which is mostly typical for impersonating a browser.
  • Not disabling HTTP redirects
  • Either not using HTTPS or for the origin server to redirect to a malicious origin.

Remediation

  • Upgrading to at least urllib3 v1.26.17 or v2.0.6
  • Disabling HTTP redirects using redirects=False when sending requests.
  • Not using the Cookie header.
Severity ?
5.9 (Medium)
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:N
7.4 (High)
CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
Show details on source website
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{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "urllib3"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.0.0"
            },
            {
              "fixed": "2.0.6"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "urllib3"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.26.17"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2023-43804"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-200"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2023-10-02T23:27:05Z",
    "nvd_published_at": "2023-10-04T17:15:10Z",
    "severity": "HIGH"
  },
  "details": "urllib3 doesn\u0027t treat the `Cookie` HTTP header special or provide any helpers for managing cookies over HTTP, that is the responsibility of the user. However, it is possible for a user to specify a `Cookie` header and unknowingly leak information via HTTP redirects to a different origin if that user doesn\u0027t disable redirects explicitly.\n\nUsers **must** handle redirects themselves instead of relying on urllib3\u0027s automatic redirects to achieve safe processing of the `Cookie` header, thus we decided to strip the header by default in order to further protect users who aren\u0027t using the correct approach.\n\n## Affected usages\n\nWe believe the number of usages affected by this advisory is low. It requires all of the following to be true to be exploited:\n\n* Using an affected version of urllib3 (patched in v1.26.17 and v2.0.6)\n* Using the `Cookie` header on requests, which is mostly typical for impersonating a browser.\n* Not disabling HTTP redirects\n* Either not using HTTPS or for the origin server to redirect to a malicious origin.\n\n## Remediation\n\n* Upgrading to at least urllib3 v1.26.17 or v2.0.6\n* Disabling HTTP redirects using `redirects=False` when sending requests.\n* Not using the `Cookie` header.",
  "id": "GHSA-v845-jxx5-vc9f",
  "modified": "2025-11-04T16:45:50Z",
  "published": "2023-10-02T23:27:05Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/urllib3/urllib3/security/advisories/GHSA-v845-jxx5-vc9f"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-43804"
    },
    {
      "type": "WEB",
      "url": "https://github.com/urllib3/urllib3/commit/01220354d389cd05474713f8c982d05c9b17aafb"
    },
    {
      "type": "WEB",
      "url": "https://github.com/urllib3/urllib3/commit/644124ecd0b6e417c527191f866daa05a5a2056d"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pypa/advisory-database/tree/main/vulns/urllib3/PYSEC-2023-192.yaml"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/urllib3/urllib3"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2023/10/msg00012.html"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2024/12/msg00020.html"
    },
    {
      "type": "WEB",
      "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/5F5CUBAN5XMEBVBZPHFITBLMJV5FIJJ5"
    },
    {
      "type": "WEB",
      "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/I3PR7C6RJ6JUBQKIJ644DMIJSUP36VDY"
    },
    {
      "type": "WEB",
      "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/NDAGZXYJ7H2G3SB47M453VQVNAWKAEJJ"
    },
    {
      "type": "WEB",
      "url": "https://security.netapp.com/advisory/ntap-20241213-0007"
    },
    {
      "type": "WEB",
      "url": "https://www.vicarius.io/vsociety/posts/cve-2023-43804-urllib3-vulnerability-3"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "`Cookie` HTTP header isn\u0027t stripped on cross-origin redirects"
}


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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
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  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.