CVE-2021-4189
Publication date 31 December 2021
Last updated 24 July 2024
Ubuntu priority
Cvss 3 Severity Score
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.
Status
Package | Ubuntu Release | Status |
---|---|---|
python2.7 | 24.04 LTS noble | Not in release |
22.04 LTS jammy |
Fixed 2.7.18-13ubuntu1.2+esm1
|
|
20.04 LTS focal |
Fixed 2.7.18-1~20.04.4+esm1
|
|
18.04 LTS bionic |
Fixed 2.7.17-1~18.04ubuntu1.7
|
|
16.04 LTS xenial |
Fixed 2.7.12-1ubuntu0~16.04.18+esm1
|
|
14.04 LTS trusty |
Fixed 2.7.6-8ubuntu0.6+esm12
|
|
python3.10 | 24.04 LTS noble | Not in release |
22.04 LTS jammy |
Not affected
|
|
20.04 LTS focal | Not in release | |
18.04 LTS bionic | Not in release | |
16.04 LTS xenial | Not in release | |
14.04 LTS trusty | Not in release | |
python3.4 | 24.04 LTS noble | Not in release |
22.04 LTS jammy | Not in release | |
20.04 LTS focal | Not in release | |
18.04 LTS bionic | Not in release | |
16.04 LTS xenial | Not in release | |
14.04 LTS trusty |
Fixed 3.4.3-1ubuntu1~14.04.7+esm12
|
|
python3.5 | 24.04 LTS noble | Not in release |
22.04 LTS jammy | Not in release | |
20.04 LTS focal | Not in release | |
18.04 LTS bionic | Not in release | |
16.04 LTS xenial |
Fixed 3.5.2-2ubuntu0~16.04.13+esm2
|
|
14.04 LTS trusty |
Fixed 3.5.2-2ubuntu0~16.04.4~14.04.1+esm1
|
|
python3.6 | 24.04 LTS noble | Not in release |
22.04 LTS jammy | Not in release | |
20.04 LTS focal | Not in release | |
18.04 LTS bionic |
Fixed 3.6.9-1~18.04ubuntu1.7
|
|
16.04 LTS xenial | Not in release | |
14.04 LTS trusty | Not in release | |
python3.7 | 24.04 LTS noble | Not in release |
22.04 LTS jammy | Not in release | |
20.04 LTS focal | Not in release | |
18.04 LTS bionic |
Fixed 3.7.5-2ubuntu1~18.04.2+esm3
|
|
16.04 LTS xenial | Not in release | |
14.04 LTS trusty | Not in release | |
python3.8 | 24.04 LTS noble | Not in release |
22.04 LTS jammy | Not in release | |
20.04 LTS focal |
Not affected
|
|
18.04 LTS bionic |
Fixed 3.8.0-3ubuntu1~18.04.2+esm2
|
|
16.04 LTS xenial | Not in release | |
14.04 LTS trusty | Not in release | |
python3.9 | 24.04 LTS noble | Not in release |
22.04 LTS jammy | Not in release | |
20.04 LTS focal |
Not affected
|
|
18.04 LTS bionic | Not in release | |
16.04 LTS xenial | Not in release | |
14.04 LTS trusty | Not in release |
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Package | Patch details |
---|---|
python3.10 |
|
python3.6 |
|
python3.7 |
|
python3.9 |
|
Severity score breakdown
Parameter | Value |
---|---|
Base score | 5.3 · Medium |
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
Related Ubuntu Security Notices (USN)
- USN-5342-1
- Python vulnerabilities
- 28 March 2022
- USN-5342-2
- Python vulnerabilities
- 24 August 2022
- USN-6891-1
- Python vulnerabilities
- 11 July 2024
Other 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://www.cve.org/CVERecord?id=CVE-2021-4189