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.
References
| Link | Resource |
|---|---|
| https://github.com/python/cpython/commit/0ab152c6b5d95caa2dc1a30fa96e10258b5f188e | Patch Third Party Advisory |
| https://access.redhat.com/security/cve/CVE-2021-4189 | Third Party Advisory |
| https://bugzilla.redhat.com/show_bug.cgi?id=2036020 | Issue Tracking Patch Third Party Advisory |
| https://security-tracker.debian.org/tracker/CVE-2021-4189 | Third Party Advisory |
| https://bugs.python.org/issue43285 | Patch Vendor Advisory |
| https://python-security.readthedocs.io/vuln/ftplib-pasv.html | Patch Third Party Advisory |
| https://security.netapp.com/advisory/ntap-20221104-0004/ | Third Party Advisory |
| https://lists.debian.org/debian-lts-announce/2023/05/msg00024.html | |
| https://lists.debian.org/debian-lts-announce/2023/06/msg00039.html |
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History
30 Jun 2023, 23:15
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24 May 2023, 21:15
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Information
Published : 2022-08-24 16:15
Updated : 2023-06-30 23:15
NVD link : CVE-2021-4189
Mitre link : CVE-2021-4189
JSON object : View
Products Affected
debian
- debian_linux
redhat
- enterprise_linux
- software_collections
python
- python
netapp
- ontap_select_deploy_administration_utility
CWE
CWE-252
Unchecked Return Value