Unchecked Return Value Affecting python3-libs package, versions <0:3.6.8-45.el8
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Test your applications- Snyk ID SNYK-RHEL8-PYTHON3LIBS-4268569
- published 30 Dec 2021
- disclosed 21 Dec 2021
Introduced: 21 Dec 2021
CVE-2021-4189 Open this link in a new tabHow to fix?
Upgrade RHEL:8 python3-libs to version 0:3.6.8-45.el8 or higher.
This issue was patched in RHSA-2022:1986.
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 RHEL.
See How to fix? for RHEL:8 relevant fixed versions and status.
A flaw was found in Python, specifically in the FTP (File Transfer Protocol) client library in PASV (passive) mode. The issue is how the FTP client trusts the host from the PASV response by default. This flaw allows an attacker to set up a malicious FTP server that can trick FTP clients into connecting back to a given IP address and port. This vulnerability could lead to FTP client scanning ports, which otherwise would not have been possible.
References
- https://access.redhat.com/security/cve/CVE-2021-4189
- https://access.redhat.com/errata/RHSA-2022:1986
- https://bugs.python.org/issue43285
- https://bugzilla.redhat.com/show_bug.cgi?id=2036020
- https://github.com/python/cpython/commit/0ab152c6b5d95caa2dc1a30fa96e10258b5f188e
- https://lists.debian.org/debian-lts-announce/2023/05/msg00024.html
- https://lists.debian.org/debian-lts-announce/2023/06/msg00039.html
- https://python-security.readthedocs.io/vuln/ftplib-pasv.html
- https://security-tracker.debian.org/tracker/CVE-2021-4189
- https://security.netapp.com/advisory/ntap-20221104-0004/