CVE-2021-4189
Published: 31 December 2021
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.
Priority
Medium
CVSS 3 base score: 5.3
Status
| Package | Release | Status |
|---|---|---|
|
python2.7 Launchpad, Ubuntu, Debian |
bionic |
Released
(2.7.17-1~18.04ubuntu1.7)
|
| focal |
Needed
|
|
| hirsute |
Ignored
(reached end-of-life)
|
|
| impish |
Ignored
(reached end-of-life)
|
|
| jammy |
Needed
|
|
| kinetic |
Needed
|
|
| trusty |
Released
(2.7.6-8ubuntu0.6+esm12)
|
|
| upstream |
Needs triage
|
|
| xenial |
Released
(2.7.12-1ubuntu0~16.04.18+esm1)
|
|
|
python3.10 Launchpad, Ubuntu, Debian |
bionic |
Does not exist
|
| focal |
Does not exist
|
|
| hirsute |
Ignored
(reached end-of-life)
|
|
| impish |
Not vulnerable
(3.10.0-2)
|
|
| jammy |
Not vulnerable
(3.10.0-2)
|
|
| kinetic |
Not vulnerable
(3.10.0-2)
|
|
| trusty |
Does not exist
|
|
| upstream |
Needs triage
|
|
| xenial |
Does not exist
|
|
|
Patches: upstream: https://github.com/python/cpython/commit/0ab152c6b5d95caa2dc1a30fa96e10258b5f188e |
||
|
python3.4 Launchpad, Ubuntu, Debian |
bionic |
Does not exist
|
| focal |
Does not exist
|
|
| hirsute |
Does not exist
|
|
| impish |
Does not exist
|
|
| jammy |
Does not exist
|
|
| kinetic |
Does not exist
|
|
| trusty |
Released
(3.4.3-1ubuntu1~14.04.7+esm12)
|
|
| upstream |
Needed
|
|
| xenial |
Does not exist
|
|
|
python3.5 Launchpad, Ubuntu, Debian |
bionic |
Does not exist
|
| focal |
Does not exist
|
|
| hirsute |
Does not exist
|
|
| impish |
Does not exist
|
|
| jammy |
Does not exist
|
|
| kinetic |
Does not exist
|
|
| trusty |
Needed
|
|
| upstream |
Needed
|
|
| xenial |
Released
(3.5.2-2ubuntu0~16.04.13+esm2)
|
|
|
python3.6 Launchpad, Ubuntu, Debian |
bionic |
Released
(3.6.9-1~18.04ubuntu1.7)
|
| focal |
Does not exist
|
|
| hirsute |
Does not exist
|
|
| impish |
Does not exist
|
|
| jammy |
Does not exist
|
|
| kinetic |
Does not exist
|
|
| trusty |
Does not exist
|
|
| upstream |
Released
(3.6.14)
|
|
| xenial |
Does not exist
|
|
|
Patches: upstream: https://github.com/python/cpython/commit/4134f154ae2f621f25c5d698cc0f1748035a1b88 |
||
|
python3.7 Launchpad, Ubuntu, Debian |
bionic |
Needed
|
| focal |
Does not exist
|
|
| hirsute |
Does not exist
|
|
| impish |
Does not exist
|
|
| jammy |
Does not exist
|
|
| kinetic |
Does not exist
|
|
| trusty |
Does not exist
|
|
| upstream |
Released
(3.7.11)
|
|
| xenial |
Does not exist
|
|
|
Patches: upstream: https://github.com/python/cpython/commit/79373951b3eab585d42e0f0ab83718cbe1d0ee33 |
||
|
python3.8 Launchpad, Ubuntu, Debian |
bionic |
Needed
|
| focal |
Not vulnerable
|
|
| hirsute |
Does not exist
|
|
| impish |
Does not exist
|
|
| jammy |
Does not exist
|
|
| kinetic |
Does not exist
|
|
| trusty |
Does not exist
|
|
| upstream |
Needed
|
|
| xenial |
Does not exist
|
|
|
python3.9 Launchpad, Ubuntu, Debian |
bionic |
Does not exist
|
| focal |
Needed
|
|
| hirsute |
Ignored
(reached end-of-life)
|
|
| impish |
Not vulnerable
(3.9.7-2build1)
|
|
| jammy |
Does not exist
|
|
| kinetic |
Does not exist
|
|
| trusty |
Does not exist
|
|
| upstream |
Released
(3.9.7-1)
|
|
| xenial |
Does not exist
|
|
|
Patches: upstream: https://github.com/python/cpython/commit/7dcb4baa4f0fde3aef5122a8e9f6a41853ec9335 |
||
References
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-4189
- https://bugs.python.org/issue43285
- https://github.com/python/cpython/commit/0ab152c6b5d95caa2dc1a30fa96e10258b5f188e (master)
- https://github.com/python/cpython/commit/7dcb4baa4f0fde3aef5122a8e9f6a41853ec9335 (v3.9.3)
- https://github.com/python/cpython/commit/79373951b3eab585d42e0f0ab83718cbe1d0ee33 (v3.7.11)
- https://github.com/python/cpython/commit/4134f154ae2f621f25c5d698cc0f1748035a1b88 (v3.6.14)
- https://bugzilla.redhat.com/show_bug.cgi?id=2036020
- https://ubuntu.com/security/notices/USN-5342-1
- NVD
- Launchpad
- Debian