CVE-2021-4189
First published: Tue Dec 21 2021(Updated: )
Python could allow a remote attacker to obtain sensitive information, caused by a flaw when using the FTP client library in PASV (passive) mode. By using a specially-crafted FTP server, an attacker could exploit this vulnerability to obtain service banner information from private network., and use this information to launch further attacks against the affected system.
Credit: secalert@redhat.com
| Affected Software | Affected Version | How 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 | ||
| 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/python2.7 | <=2.7.16-2+deb10u1<=2.7.18-8+deb11u1 | 2.7.16-2+deb10u3 |
| debian/python3.10 | 3.10.13-1 | |
| debian/python3.7 | <=3.7.3-2+deb10u3 | 3.7.3-2+deb10u6 |
| debian/python3.9 | <=3.9.2-1 |
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Reference Links
- https://exchange.xforce.ibmcloud.com/vulnerabilities/227269
- https://www.ibm.com/support/pages/node/7080058 (Advisory)
- 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://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/
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2036021
- https://access.redhat.com/errata/RHSA-2022:1663
- https://access.redhat.com/errata/RHSA-2022:1821
- https://access.redhat.com/errata/RHSA-2022:1986
- https://access.redhat.com/security/cve/cve-2021-4189
- https://www.cve.org/CVERecord?id=CVE-2021-4189 https://nvd.nist.gov/vuln/detail/CVE-2021-4189 https://bugs.python.org/issue43285
- https://access.redhat.com/errata/RHSA-2021:3254
- https://github.com/python/cpython/commit/7dcb4baa4f0fde3aef5122a8e9f6a41853ec9335
- https://github.com/python/cpython/commit/79373951b3eab585d42e0f0ab83718cbe1d0ee33
- https://github.com/python/cpython/commit/4134f154ae2f621f25c5d698cc0f1748035a1b88
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.
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