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AUSCERT External Security Bulletin Redistribution
ESB-2020.1411.3
OpenSSH vulnerability CVE-2019-6111
17 August 2021
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: BIG-IP
Enterprise Manager
BIG-IQ Centralized Management
F5 iWorkflow
Traffix SDC
Publisher: F5 Networks
Operating System: Network Appliance
Impact/Access: Overwrite Arbitrary Files -- Remote with User Interaction
Provide Misleading Information -- Remote with User Interaction
Resolution: Mitigation
CVE Names: CVE-2019-6111
Reference: ESB-2019.4117
Original Bulletin:
https://support.f5.com/csp/article/K21350967
Revision History: August 17 2021: Vendor issues branch updates
January 6 2021: Additional vulnerable versions added by vendor
April 23 2020: Initial Release
- --------------------------BEGIN INCLUDED TEXT--------------------
K21350967: OpenSSH vulnerability CVE-2019-6111
Original Publication Date: 18 Jan, 2019
Latest Publication Date: 17 Aug, 2021
Security Advisory Description
An issue was discovered in OpenSSH 7.9. Due to the scp implementation being
derived from 1983 rcp, the server chooses which files/directories are sent to
the client. However, the scp client only performs cursory validation of the
object name returned (only directory traversal attacks are prevented). A
malicious scp server (or Man-in-The-Middle attacker) can overwrite arbitrary
files in the scp client target directory. If recursive operation (-r) is
performed, the server can manipulate subdirectories as well (for example, to
overwrite the .ssh/authorized_keys file). (CVE-2019-6111)
Impact
Improper validation of object names allows a malicious server to overwrite
files through the OpenSSH SCP client.
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 H21350967 on the Diagnostics > Identified > Medium 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 | | | |
| | |15.1.3 | | | | |
|BIG-IP (LTM, AAM, +------+----------+----------+ | | |
|AFM, Analytics, APM, |14.x |14.1.0 - |None | | | |
|ASM, DNS, Edge | |14.1.4 | | | |OpenSSH |
|Gateway, FPS, +------+----------+----------+Medium |5.3 |(SCP |
|GTM, Link Controller,|13.x |13.1.0 - |Will not | | |client) |
|PEM, WebAccelerator) | |13.1.4 |fix | | | |
| +------+----------+----------+ | | |
| |12.x |12.1.0 - |Will not | | | |
| | |12.1.6 |fix | | | |
| +------+----------+----------+ | | |
| |11.x |11.6.1 - |Will not | | | |
| | |11.6.5 |fix | | | |
+---------------------+------+----------+----------+--------+------+----------+
| | | | | | |OpenSSH |
|Enterprise Manager |3.x |3.1.1 |None |Medium |5.3 |(SCP |
| | | | | | |client) |
+---------------------+------+----------+----------+--------+------+----------+
| |8.x |8.0.0 - |None | | | |
| | |8.1.0 | | | | |
| +------+----------+----------+ | | |
| |7.x |7.0.0 - |None | | | |
|BIG-IQ Centralized | |7.1.0 | | | |OpenSSH |
|Management +------+----------+----------+Medium |5.3 |(SCP |
| |6.x |6.0.0 - |None | | |client) |
| | |6.1.0 | | | | |
| +------+----------+----------+ | | |
| |5.x |5.0.0 - |None | | | |
| | |5.4.0 | | | | |
+---------------------+------+----------+----------+--------+------+----------+
| | | | | | |OpenSSH |
|F5 iWorkflow |2.x |2.3.0 |None |Medium |5.3 |(SCP |
| | | | | | |client) |
+---------------------+------+----------+----------+--------+------+----------+
| |5.x |5.0.0 - |None | | |OpenSSH |
|Traffix SDC | |5.1.0 | |Medium |5.3 |(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.
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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