Bug 2036020 (CVE-2021-4189) - CVE-2021-4189 python: ftplib should not use the host from the PASV response
Summary: CVE-2021-4189 python: ftplib should not use the host from the PASV response
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2021-4189
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 2036021 2036345 2036346 2036347 2036349 2036350 2036351 2036352 2036353 2036354 2036355 2064444 2064445
Blocks: 2034737 2036048
TreeView+ depends on / blocked
 
Reported: 2021-12-29 10:28 UTC by Dhananjay Arunesh
Modified: 2023-09-26 18:39 UTC (History)
24 users (show)

Fixed In Version: python 3.6.14, python 3.7.11, python 3.8.9, python 3.9.3, python 3.10.0
Clone Of:
Environment:
Last Closed: 2022-05-11 14:15:25 UTC
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2022:1663 0 None None None 2022-05-02 08:05:19 UTC
Red Hat Product Errata RHSA-2022:1821 0 None None None 2022-05-10 13:39:35 UTC
Red Hat Product Errata RHSA-2022:1986 0 None None None 2022-05-10 14:44:12 UTC

Description Dhananjay Arunesh 2021-12-29 10:28:46 UTC 
The problem is ftp client trust the host from PASV response by default, A malicious server can trick ftp client into connecting back to a given IP address and port. This may make ftp client scan ports and extract service banner from private network.

References:
https://bugs.python.org/issue43285
Comment 1 Dhananjay Arunesh 2021-12-29 10:29:27 UTC 
Created python34 tracking bugs for this issue:

Affects: epel-7 [bug 2036021]
Comment 9 Tomas Hoger 2022-03-24 21:04:25 UTC 
Upstream vulnerability page:

https://python-security.readthedocs.io/vuln/ftplib-pasv.html

Fixed upstream in 3.6.14, 3.7.11, 3.8.9, 3.9.3, and 3.10.0.

Upstream fix:

https://github.com/python/cpython/commit/0ab152c6b5d95caa2dc1a30fa96e10258b5f188e
Comment 10 errata-xmlrpc 2022-05-02 08:05:16 UTC 
This issue has been addressed in the following products:

  Red Hat Software Collections for Red Hat Enterprise Linux 7

Via RHSA-2022:1663 https://access.redhat.com/errata/RHSA-2022:1663
Comment 11 errata-xmlrpc 2022-05-10 13:39:32 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2022:1821 https://access.redhat.com/errata/RHSA-2022:1821
Comment 12 errata-xmlrpc 2022-05-10 14:44:10 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2022:1986 https://access.redhat.com/errata/RHSA-2022:1986
Comment 13 Product Security DevOps Team 2022-05-11 14:15:22 UTC 
This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):

https://access.redhat.com/security/cve/cve-2021-4189
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