CVE-2023-43804: `Cookie` HTTP header isn't stripped on cross-origin redirects

CVE-2023-43804 · Severity: low · CVSS 3.1 · Published 2023-10-04

urllib3 is a user-friendly HTTP client library for Python. 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. This issue has been patched in urllib3 version 1.26.17 or 2.0.5.

Technologies: urllib3 (PyPI). Vendors: PyPI.

Quick answers

Is CVE-2023-43804 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2023-43804 being exploited in the wild.
How severe is CVE-2023-43804?
Low severity, with a CVSS score of 3.1, published 4 October 2023.
Which products and versions are affected?
urllib3 (PyPI) ECOSYSTEM:introduced=2.0.0,fixed=2.0.6, GIT:introduced=0,fixed=644124ecd0b6e417c527191f866daa05a5a2056d,fixed=01220354d389cd05474713f8c982d05c9b17aafb|ECOSYSTEM:introduced=2.0.0,fixed=2.0.6,introduced=0,fixed=1.26.17.
Is there a fix for CVE-2023-43804?
Yes. urllib3 (PyPI): upgrade to 1.26.17, 2.0.6 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
Am I affected by CVE-2023-43804?
Check whether you run urllib3 (PyPI) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • urllib3 (PyPI): upgrade to 1.26.17, 2.0.6 or later
    pip install "urllib3>=2.0.6"

Affected products

  • urllib3 (PyPI) ECOSYSTEM:introduced=2.0.0,fixed=2.0.6, GIT:introduced=0,fixed=644124ecd0b6e417c527191f866daa05a5a2056d,fixed=01220354d389cd05474713f8c982d05c9b17aafb|ECOSYSTEM:introduced=2.0.0,fixed=2.0.6,introduced=0,fixed=1.26.17

Identifiers

  • CVE-2023-43804
  • GHSA-v845-jxx5-vc9f
  • PYSEC-2023-192

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