Unchecked Return Value Affecting python3.5 package, versions <3.5.2-2ubuntu0~16.04.13+esm2
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Test your applications- Snyk ID SNYK-UBUNTU1604-PYTHON35-2329927
- published 5 Jan 2022
- disclosed 24 Aug 2022
Introduced: 5 Jan 2022
CVE-2021-4189 Open this link in a new tabHow to fix?
Upgrade Ubuntu:16.04 python3.5 to version 3.5.2-2ubuntu0~16.04.13+esm2 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream python3.5 package and not the python3.5 package as distributed by Ubuntu.
See How to fix? for Ubuntu:16.04 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
- http://people.ubuntu.com/~ubuntu-security/cve/CVE-2021-4189
- https://access.redhat.com/security/cve/CVE-2021-4189
- https://bugs.python.org/issue43285
- https://bugzilla.redhat.com/show_bug.cgi?id=2036020
- https://github.com/python/cpython/commit/0ab152c6b5d95caa2dc1a30fa96e10258b5f188e
- 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/
- https://lists.debian.org/debian-lts-announce/2023/05/msg00024.html
- https://lists.debian.org/debian-lts-announce/2023/06/msg00039.html