CVE-2021-33503 (High) detected in urllib3-1.25.11-py2.py3-none-any.whl

[simin-xia]

CVE-2021-33503 - High Severity Vulnerability

Vulnerable Library - urllib3-1.25.11-py2.py3-none-any.whl

HTTP library with thread-safe connection pooling, file post, and more.

Library home page: https://files.pythonhosted.org/packages/56/aa/4ef5aa67a9a62505db124a5cb5262332d1d4153462eb8fd89c9fa41e5d92/urllib3-1.25.11-py2.py3-none-any.whl

Vulnerability Details

An issue was discovered in urllib3 before 1.26.5. When provided with a URL containing many @ characters in the authority component, the authority regular expression exhibits catastrophic backtracking, causing a denial of service if a URL were passed as a parameter or redirected to via an HTTP redirect.

Publish Date: 2021-06-29

URL: CVE-2021-33503

CVSS 3 Score Details (7.5)

Base Score Metrics:

• Exploitability Metrics:
  • Attack Vector: Network
  • Attack Complexity: Low
  • Privileges Required: None
  • User Interaction: None
  • Scope: Unchanged
• Impact Metrics:
  • Confidentiality Impact: None
  • Integrity Impact: None
  • Availability Impact: High

For more information on CVSS3 Scores, click here.

Suggested Fix

Type: Upgrade version

Origin: https://github.com/urllib3/urllib3/security/advisories/GHSA-q2q7-5pp4-w6pg

Release Date: 2021-06-29

Fix Resolution: urllib3 - 1.26.5

[cjin62]

@adammike @tachyonknave @colin-pm I see 0.11.3 will include the fix to resolve this vulnerability if I am correct. You know when 0.11.3 will be released? I see the change log states "0.11.3 (May 6th, 2022)" but latest release on the HVAC site is still 0.11.2: https://pypi.org/project/hvac/#files

[briantist]

Resolved by #854