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AUSCERT External Security Bulletin Redistribution
ESB-2019.0346.3
A vulnerability has been identified in F5 products
6 January 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: F5 Products
Publisher: F5 Networks
Operating System: Network Appliance
Impact/Access: Modify Arbitrary Files -- Remote with User Interaction
Provide Misleading Information -- Remote with User Interaction
Resolution: Mitigation
CVE Names: CVE-2019-6110
Reference: ESB-2019.0164.2
Original Bulletin:
https://support.f5.com/csp/article/K42531048
Revision History: January 6 2021: Additional vulnerable versions added by vendor
April 23 2020: Confirmed Enterprise Manager and F5 iWorkflow are vulnerable
February 6 2019: Initial Release
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K42531048: OpenSSH vulnerability CVE-2019-6110
Original Publication Date: 18 Jan, 2019
Latest Publication Date: 06 Jan, 2021
Security Advisory Description
In OpenSSH 7.9, due to accepting and displaying arbitrary stderr output from
the server, a malicious server (or Man-in-The-Middle attacker) can manipulate
the client output, for example to use ANSI control codes to hide additional
files being transferred. (CVE-2019-6110)
Impact
Acceptance and display of arbitrary stderr allows for spoofing of OpenSSH SCP
client output.
Security Advisory Status
F5 Product Development has assigned ID 757604 (BIG-IP), ID 757604-8 (BIG-IQ),
ID 757604-9 (Enterprise Manager), ID 757604-10 (F5 iWorkflow), and CPF-25054
and CPF-25055 (Traffix) to this vulnerability. Additionally, BIG-IP iHealth may
list Heuristic H42531048 on the Diagnostics > Identified > Low page.
To determine if your product and version have been evaluated for this
vulnerability, refer to the Applies to (see versions) 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| | | | |
+---------------------+------+----------+----------+--------+------+----------+
| |16.x |16.0.0 - |None | | | |
| | |16.0.1 | | | | |
| +------+----------+----------+ | | |
| |15.x |15.1.0 - |None | | | |
| | |15.1.2 | | | | |
|BIG-IP (LTM, AAM, +------+----------+----------+ | | |
|AFM, Analytics, APM, |14.x |14.1.0 - |None | | | |
|ASM, DNS, Edge | |14.1.3 | | | |OpenSSH |
|Gateway, FPS, +------+----------+----------+Low |3.1 |(SCP |
|GTM, Link Controller,|13.x |13.1.0 - |None | | |client) |
|PEM, WebAccelerator) | |13.1.3 | | | | |
| +------+----------+----------+ | | |
| |12.x |12.1.0 - |None | | | |
| | |12.1.5 | | | | |
| +------+----------+----------+ | | |
| |11.x |11.6.1 - |None | | | |
| | |11.6.5 | | | | |
+---------------------+------+----------+----------+--------+------+----------+
| | | | | | |OpenSSH |
|Enterprise Manager |3.x |3.1.1 |None |Low |3.1 |(SCP |
| | | | | | |client) |
+---------------------+------+----------+----------+--------+------+----------+
| |7.x |7.0.0 - |None | | | |
| | |7.1.0 | | | | |
| +------+----------+----------+ | |OpenSSH |
|BIG-IQ Centralized |6.x |6.0.0 - |None |Low |3.1 |(SCP |
|Management | |6.1.0 | | | |client) |
| +------+----------+----------+ | | |
| |5.x |5.0.0 - |None | | | |
| | |5.4.0 | | | | |
+---------------------+------+----------+----------+--------+------+----------+
| | | | | | |OpenSSH |
|F5 iWorkflow |2.x |2.3.0 |None |Low |3.1 |(SCP |
| | | | | | |client) |
+---------------------+------+----------+----------+--------+------+----------+
| |5.x |5.0.0 - |None | | |OpenSSH |
|Traffix SDC | |5.1.0 | |Low |3.1 |(SCP |
| +------+----------+----------+ | |client) |
| |4.x |4.4.0 |None | | | |
+---------------------+------+----------+----------+--------+------+----------+
^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
There is no mitigation for a man-in-the-middle (MITM) attack.
You can mitigate the vulnerability from a malicious server by verifying the
host key fingerprint when connecting to systems with the SCP client.
Supplemental Information
o K51812227: Understanding Security Advisory versioning
o K41942608: Overview of AskF5 Security Advisory articles
o K4602: Overview of the F5 security vulnerability response policy
o K4918: Overview of the F5 critical issue hotfix policy
o K9970: Subscribing to email notifications regarding F5 products
o K9957: Creating a custom RSS feed to view new and updated documents
o K31781390: January 2019 OpenSSH security vulnerabilities
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