CWE
252
Advisory Published
CVE Published
Updated

CVE-2021-4189

First published: Tue Dec 21 2021(Updated: )

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.

Credit: secalert@redhat.com secalert@redhat.com

Affected SoftwareAffected VersionHow to fix
redhat/python3<0:3.6.8-45.el8
0:3.6.8-45.el8
redhat/rh-python38-babel<0:2.7.0-12.el7
0:2.7.0-12.el7
redhat/rh-python38-python<0:3.8.11-2.el7
0:3.8.11-2.el7
redhat/rh-python38-python-cryptography<0:2.8-5.el7
0:2.8-5.el7
redhat/rh-python38-python-jinja2<0:2.10.3-6.el7
0:2.10.3-6.el7
redhat/rh-python38-python-lxml<0:4.4.1-7.el7
0:4.4.1-7.el7
redhat/rh-python38-python-pip<0:19.3.1-2.el7
0:19.3.1-2.el7
redhat/rh-python38-python-urllib3<0:1.25.7-7.el7
0:1.25.7-7.el7
redhat/python27-python<0:2.7.18-4.el7
0:2.7.18-4.el7
Python Python>=3.6.0<3.6.14
Python Python>=3.7.0<3.7.11
Python Python>=3.8.0<3.8.9
Python Python>=3.9.0<3.9.3
Python Python=3.10.0
Debian Debian Linux=10.0
Debian Debian Linux=11.0
Redhat Software Collections
Redhat Enterprise Linux=8.0
NetApp ONTAP Select Deploy administration utility
redhat/python<3.6.14
3.6.14
redhat/python<3.7.11
3.7.11
redhat/python<3.8.9
3.8.9
redhat/python<3.9.3
3.9.3
redhat/python<3.10.0
3.10.0
IBM Cloud Pak for Security<=1.10.0.0 - 1.10.11.0
IBM QRadar Suite Software<=1.10.12.0 - 1.10.16.0
debian/pypy3<=7.3.5+dfsg-2+deb11u2
7.3.11+dfsg-2+deb12u2
7.3.17+dfsg-2
debian/python2.7<=2.7.18-8+deb11u1
debian/python3.9<=3.9.2-1

Never miss a vulnerability like this again

Sign up to SecAlerts for real-time vulnerability data matched to your software, aggregated from hundreds of sources.

Reference Links

Parent vulnerabilities

(Appears in the following advisories)

Frequently Asked Questions

  • What is CVE-2021-4189?

    CVE-2021-4189 is a vulnerability found in Python's FTP (File Transfer Protocol) client library in PASV (passive) mode.

  • How does the vulnerability in CVE-2021-4189 affect Python?

    The vulnerability in CVE-2021-4189 allows an attacker to set up a malicious FTP server that can trick FTP clients into connecting to it.

  • What is the severity level of CVE-2021-4189?

    The severity level of CVE-2021-4189 is medium, with a CVSS score of 5.3.

  • Which versions of Python are affected by CVE-2021-4189?

    The versions affected by CVE-2021-4189 are Python 3.6.14, Python 3.7.11, Python 3.8.9, Python 3.9.3, and Python 3.10.0.

  • How can I fix the vulnerability in Python identified as CVE-2021-4189?

    To fix the vulnerability in Python identified as CVE-2021-4189, you should update to Python versions 3.6.14, 3.7.11, 3.8.9, 3.9.3, or 3.10.0, depending on the version you are currently using.

Contact

SecAlerts Pty Ltd.
132 Wickham Terrace
Fortitude Valley,
QLD 4006, Australia
info@secalerts.co
By using SecAlerts services, you agree to our services end-user license agreement. This website is safeguarded by reCAPTCHA and governed by the Google Privacy Policy and Terms of Service. All names, logos, and brands of products are owned by their respective owners, and any usage of these names, logos, and brands for identification purposes only does not imply endorsement. If you possess any content that requires removal, please get in touch with us.
© 2024 SecAlerts Pty Ltd.
ABN: 70 645 966 203, ACN: 645 966 203