Resource Exhaustion Affecting python-urllib3 package, versions <0:1.25.9-1.amzn2.0.2


Severity

Recommended
medium

Based on Amazon Linux security rating.

Threat Intelligence

EPSS
3.27% (88th percentile)

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  • Snyk IDSNYK-AMZN2-PYTHONURLLIB3-1702502
  • published27 Sept 2021
  • disclosed29 Jun 2021

Introduced: 29 Jun 2021

CVE-2021-33503  (opens in a new tab)
CWE-400  (opens in a new tab)

How to fix?

Upgrade Amazon-Linux:2 python-urllib3 to version 0:1.25.9-1.amzn2.0.2 or higher.
This issue was patched in ALAS2-2021-1688.

NVD Description

Note: Versions mentioned in the description apply only to the upstream python-urllib3 package and not the python-urllib3 package as distributed by Amazon-Linux. See How to fix? for Amazon-Linux:2 relevant fixed versions and status.

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.

CVSS Base Scores

version 3.1