HTTP Request Smuggling Affecting python3-libs package, versions <0:3.7.9-1.amzn2.0.3


Severity

Recommended
0.0
medium
0
10

Based on Amazon Linux security rating.

Threat Intelligence

EPSS
0.14% (52nd percentile)

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  • Snyk IDSNYK-AMZN2-PYTHON3LIBS-1698996
  • published27 Sept 2021
  • disclosed15 Feb 2021

Introduced: 15 Feb 2021

CVE-2021-23336  (opens in a new tab)
CWE-444  (opens in a new tab)

How to fix?

Upgrade Amazon-Linux:2 python3-libs to version 0:3.7.9-1.amzn2.0.3 or higher.
This issue was patched in ALAS2-2021-1640.

NVD Description

Note: Versions mentioned in the description apply only to the upstream python3-libs package and not the python3-libs package as distributed by Amazon-Linux. See How to fix? for Amazon-Linux:2 relevant fixed versions and status.

The package python/cpython from 0 and before 3.6.13, from 3.7.0 and before 3.7.10, from 3.8.0 and before 3.8.8, from 3.9.0 and before 3.9.2 are vulnerable to Web Cache Poisoning via urllib.parse.parse_qsl and urllib.parse.parse_qs by using a vector called parameter cloaking. When the attacker can separate query parameters using a semicolon (;), they can cause a difference in the interpretation of the request between the proxy (running with default configuration) and the server. This can result in malicious requests being cached as completely safe ones, as the proxy would usually not see the semicolon as a separator, and therefore would not include it in a cache key of an unkeyed parameter.

References

CVSS Scores

version 3.1