Improper Input Validation Affecting python39:3.9/python39-cryptography package, versions <0:3.3.1-2.module+el8.4.0+9822+20bf1249


Severity

Recommended
medium

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.91% (83rd percentile)

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  • Snyk IDSNYK-RHEL8-PYTHON39-4145391
  • published26 Jul 2021
  • disclosed30 Apr 2021

Introduced: 30 Apr 2021

CVE-2021-29921  (opens in a new tab)
CWE-20  (opens in a new tab)

How to fix?

Upgrade RHEL:8 python39:3.9/python39-cryptography to version 0:3.3.1-2.module+el8.4.0+9822+20bf1249 or higher.
This issue was patched in RHSA-2021:4160.

NVD Description

Note: Versions mentioned in the description apply only to the upstream python39:3.9/python39-cryptography package and not the python39:3.9/python39-cryptography package as distributed by RHEL. See How to fix? for RHEL:8 relevant fixed versions and status.

In Python before 3,9,5, the ipaddress library mishandles leading zero characters in the octets of an IP address string. This (in some situations) allows attackers to bypass access control that is based on IP addresses.

CVSS Scores

version 3.1