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AUSCERT External Security Bulletin Redistribution
ESB-2020.3515.4
OpenSSH client vulnerability CVE-2020-14145
5 February 2024
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AusCERT Security Bulletin Summary
---------------------------------
Product: BIG-IP
Publisher: F5 Networks
Operating System: Network Appliance
UNIX variants (UNIX, Linux, OSX)
Windows
Impact/Access: Provide Misleading Information -- Remote/Unauthenticated
Read-only Data Access -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2020-14145
Original Bulletin:
https://support.f5.com/csp/article/K48050136
Comment: CVSS (Max): 5.3 CVE-2020-14145 (CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N)
CVSS Source: F5 Networks
Calculator: https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N
Revision History: February 5 2024: Vendor has introduced fixes, thus, patch/updates are required
January 12 2022: Vendor updated vulnerable product list
January 6 2021: Additional vulnerable versions added by vendor
October 14 2020: Initial Release
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K48050136: OpenSSH client vulnerability CVE-2020-14145
Published Date: Oct 13, 2020
Updated Date: Feb 2, 2024
Security Advisory Description
The client side in OpenSSH 5.7 through 8.4 has an Observable Discrepancy
leading to an information leak in the algorithm negotiation. This allows
man-in-the-middle attackers to target initial connection attempts (where no
host key for the server has been cached by the client). NOTE: some reports
state that 8.5 and 8.6 are also affected. (CVE-2020-14145)
Impact
SSH sessions may be vulnerable to a man-in-the-middle attack.
Security Advisory Status
F5 Product Development has assigned ID 950605 (BIG-IP) and ID 954437 (BIG-IQ)
to this vulnerability.
To determine if your product and version have been evaluated for this
vulnerability, refer to the Evaluated products box. To determine if your
release is known to be vulnerable, the components or features that are affected
by the vulnerability, and for information about releases, point releases, or
hotfixes that address the vulnerability, refer to the following table. For more
information about security advisory versioning, refer to K51812227:
Understanding security advisory versioning.
+-------------------+------+----------+----------+----------+------+----------+
| | |Versions |Fixes | |CVSSv3|Vulnerable|
|Product |Branch|known to |introduced|Severity |score^|component |
| | |be |in | |1 |or feature|
| | |vulnerable| | | | |
+-------------------+------+----------+----------+----------+------+----------+
| |17.x |17.0.0 |17.1.0 | | | |
| +------+----------+----------+ | | |
| |16.x |16.0.0 - |16.1.4 | | | |
| | |16.1.3 | | | | |
| +------+----------+----------+ | | |
| |15.x |15.1.0 - |15.1.9 | | | |
|BIG-IP (LTM, AAM, | |15.1.8 | | | | |
|Advanced WAF, AFM, +------+----------+----------+ | | |
|Analytics, APM, |14.x |14.1.0 - |Will not | | |OpenSSH |
|ASM, DDHD, DNS, | |14.1.5 |fix |Medium |5.3 |Client |
|FPS, GTM, Link +------+----------+----------+ | | |
|Controller, PEM, |13.x |13.1.0 - |Will not | | | |
|SSLO) | |13.1.5 |fix | | | |
| +------+----------+----------+ | | |
| |12.x |None |Not | | | |
| | | |applicable| | | |
| +------+----------+----------+ | | |
| |11.x |None |Not | | | |
| | | |applicable| | | |
+-------------------+------+----------+----------+----------+------+----------+
| |8.x |8.0.0 - |None | | | |
| | |8.3.0 | | | | |
| +------+----------+----------+ | | |
| |7.x |None |Not | | | |
|BIG-IQ Centralized | | |applicable| | |OpenSSH |
|Management +------+----------+----------+Medium |5.3 |Client |
| |6.x |None |Not | | | |
| | | |applicable| | | |
| +------+----------+----------+ | | |
| |5.x |None |Not | | | |
| | | |applicable| | | |
+-------------------+------+----------+----------+----------+------+----------+
|F5OS-A |1.x |None |Not |Not |None |None |
| | | |applicable|vulnerable| | |
+-------------------+------+----------+----------+----------+------+----------+
|F5OS-C |1.x |None |Not |Not |None |None |
| | | |applicable|vulnerable| | |
+-------------------+------+----------+----------+----------+------+----------+
|Traffix SDC |5.x |None |Not |Not |None |None |
| | | |applicable|vulnerable| | |
+-------------------+------+----------+----------+----------+------+----------+
^1The CVSSv3 score link takes you to a resource outside of AskF5, and it is
possible that the document may be removed without our knowledge.
Security Advisory Recommended Actions
If you are running a version listed in the Versions known to be vulnerable
column, you can eliminate this vulnerability by upgrading to a version listed
in the Fixes introduced in column. If the table lists only an older version
than what you are currently running, or does not list a non-vulnerable version,
then no upgrade candidate currently exists.
Mitigation
Connect only to SSH servers with known and trusted host keys.
Related Content
o K41942608: Overview of security advisory articles
o K4602: Overview of the F5 security vulnerability response policy
o K4918: Overview of the F5 critical issue hotfix policy
o K9502: BIG-IP hotfix and point release matrix
o K13123: Managing BIG-IP product hotfixes (11.x - 17.x)
o K15106: Managing BIG-IQ product hotfixes
o K15113: BIG-IQ hotfix and point release matrix
o K48955220: Installing an OPSWAT Endpoint Security update on BIG-IP APM
systems (11.4.x and later)
o K167: Downloading software and firmware from F5
o K9970: Subscribing to email notifications regarding F5 products
o K9957: Creating a custom RSS feed to view new and updated documents
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