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
Status
| Package | Release | Status |
|---|---|---|
|
python2.7 Launchpad, Ubuntu, Debian |
bionic |
Released
(2.7.17-1~18.04ubuntu1.7)
|
| focal |
Released
(2.7.18-1~20.04.3+esm1)
Available with Ubuntu Pro |
|
| hirsute |
Ignored
(end of life)
|
|
| impish |
Ignored
(end of life)
|
|
| jammy |
Released
(2.7.18-13ubuntu1.1+esm2)
Available with Ubuntu Pro |
|
| kinetic |
Ignored
(end of life, was needed)
|
|
| lunar |
Does not exist
|
|
| mantic |
Does not exist
|
|
| trusty |
Released
(2.7.6-8ubuntu0.6+esm12)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only) |
|
| upstream |
Needs triage
|
|
| xenial |
Released
(2.7.12-1ubuntu0~16.04.18+esm1)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only) |
|
|
python3.10 Launchpad, Ubuntu, Debian |
bionic |
Does not exist
|
| focal |
Does not exist
|
|
| hirsute |
Ignored
(end of life)
|
|
| impish |
Not vulnerable
(3.10.0-2)
|
|
| jammy |
Not vulnerable
(3.10.0-2)
|
|
| kinetic |
Not vulnerable
(3.10.0-2)
|
|
| lunar |
Does not exist
|
|
| mantic |
Does not exist
|
|
| 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
|
|
| lunar |
Does not exist
|
|
| mantic |
Does not exist
|
|
| trusty |
Released
(3.4.3-1ubuntu1~14.04.7+esm12)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only) |
|
| 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
|
|
| lunar |
Does not exist
|
|
| mantic |
Does not exist
|
|
| trusty |
Needed
|
|
| upstream |
Needed
|
|
| xenial |
Released
(3.5.2-2ubuntu0~16.04.13+esm2)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only) |
|
|
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
|
|
| lunar |
Does not exist
|
|
| mantic |
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
|
|
| lunar |
Does not exist
|
|
| mantic |
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
|
|
| lunar |
Does not exist
|
|
| mantic |
Does not exist
|
|
| trusty |
Does not exist
|
|
| upstream |
Needed
|
|
| xenial |
Does not exist
|
|
|
python3.9 Launchpad, Ubuntu, Debian |
bionic |
Does not exist
|
| focal |
Not vulnerable
(3.9.5-3ubuntu0~20.04.1)
|
|
| hirsute |
Ignored
(end of life)
|
|
| impish |
Not vulnerable
(3.9.7-2build1)
|
|
| jammy |
Does not exist
|
|
| kinetic |
Does not exist
|
|
| lunar |
Does not exist
|
|
| mantic |
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 |
||
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 5.3 |
| Attack vector | Network |
| Attack complexity | Low |
| Privileges required | None |
| User interaction | None |
| Scope | Unchanged |
| Confidentiality | Low |
| Integrity impact | None |
| Availability impact | None |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N |
References
- 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
- https://ubuntu.com/security/notices/USN-5342-2
- https://www.cve.org/CVERecord?id=CVE-2021-4189
- NVD
- Launchpad
- Debian