Unchecked Return Value Affecting python27 package, versions <0:2.7.18-2.142.amzn1
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Test your applications- Snyk ID SNYK-AMZN201803-PYTHON27-2866056
- published 10 Jun 2022
- disclosed 24 Aug 2022
Introduced: 10 Jun 2022
CVE-2021-4189 Open this link in a new tabHow to fix?
Upgrade Amazon-Linux:2018.03
python27
to version 0:2.7.18-2.142.amzn1 or higher.
This issue was patched in ALAS-2022-1593
.
NVD Description
Note: Versions mentioned in the description apply only to the upstream python27
package and not the python27
package as distributed by Amazon-Linux
.
See How to fix?
for Amazon-Linux:2018.03
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://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-4189
- https://github.com/python/cpython/commit/0ab152c6b5d95caa2dc1a30fa96e10258b5f188e
- https://access.redhat.com/security/cve/CVE-2021-4189
- https://bugzilla.redhat.com/show_bug.cgi?id=2036020
- https://security-tracker.debian.org/tracker/CVE-2021-4189
- https://bugs.python.org/issue43285
- https://python-security.readthedocs.io/vuln/ftplib-pasv.html
- 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