Rapid7 Vulnerability & Exploit Database

Amazon Linux AMI: CVE-2021-23336: Security patch for python27 ((Multiple Advisories))

Back to Search

Amazon Linux AMI: CVE-2021-23336: Security patch for python27 ((Multiple Advisories))

Severity
4
CVSS
(AV:N/AC:H/Au:N/C:N/I:P/A:P)
Published
02/15/2021
Created
05/13/2021
Added
05/11/2021
Modified
06/10/2022

Description

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.

Solution(s)

  • amazon-linux-upgrade-python27
  • amazon-linux-upgrade-python34
  • amazon-linux-upgrade-python35
  • amazon-linux-upgrade-python36

With Rapid7 live dashboards, I have a clear view of all the assets on my network, which ones can be exploited, and what I need to do in order to reduce the risk in my environment in real-time. No other tool gives us that kind of value and insight.

– Scott Cheney, Manager of Information Security, Sierra View Medical Center

;