Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256
===========================================================================
AUSCERT External Security Bulletin Redistribution
ESB-2020.1410.2
OpenSSH vulnerability CVE-2018-20685
6 January 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: Modify Permissions -- Remote with User Interaction
Resolution: Mitigation
CVE Names: CVE-2018-20685
Reference: ESB-2019.4117
Original Bulletin:
https://support.f5.com/csp/article/K11315080
Revision History: January 6 2021: Additional vulnerable versions added by vendor
April 23 2020: Initial Release
- --------------------------BEGIN INCLUDED TEXT--------------------
K11315080: OpenSSH vulnerability CVE-2018-20685
Original Publication Date: 18 Jan, 2019
Latest Publication Date: 06 Jan, 2021
Security Advisory Description
In OpenSSH 7.9, scp.c in the scp client allows remote SSH servers to bypass
intended access restrictions via the filename of . or an empty filename. The
impact is modifying the permissions of the target directory on the client side.
(CVE-2018-20685)
Impact
The OpenSSH SCP client is vulnerable to a malicious SCP server performing
unauthorized changes to the target directory.
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 H11315080 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 | | | |
| | |15.1.2 | | | | |
|BIG-IP (LTM, AAM, +------+----------+----------+ | | |
|AFM, Analytics, APM, |14.x |14.1.0 - |None | | | |
|ASM, DNS, Edge | |14.1.3 | | | |OpenSSH |
|Gateway, FPS, +------+----------+----------+Medium |5.3 |(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 |Medium |5.3 |(SCP |
| | | | | | |client) |
+---------------------+------+----------+----------+--------+------+----------+
| |7.x |7.0.0 - |None | | | |
| | |7.1.0 | | | | |
| +------+----------+----------+ | |OpenSSH |
|BIG-IQ Centralized |6.x |6.0.0 - |None |Medium |5.3 |(SCP |
|Management | |6.1.0 | | | |client) |
| +------+----------+----------+ | | |
| |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.
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
- --------------------------END INCLUDED TEXT--------------------
You have received this e-mail bulletin as a result of your organisation's
registration with AusCERT. The mailing list you are subscribed to is
maintained within your organisation, so if you do not wish to continue
receiving these bulletins you should contact your local IT manager. If
you do not know who that is, please send an email to auscert@auscert.org.au
and we will forward your request to the appropriate person.
NOTE: Third Party Rights
This security bulletin is provided as a service to AusCERT's members. As
AusCERT did not write the document quoted above, AusCERT has had no control
over its content. The decision to follow or act on information or advice
contained in this security bulletin is the responsibility of each user or
organisation, and should be considered in accordance with your organisation's
site policies and procedures. AusCERT takes no responsibility for consequences
which may arise from following or acting on information or advice contained in
this security bulletin.
NOTE: This is only the original release of the security bulletin. It may
not be updated when updates to the original are made. If downloading at
a later date, it is recommended that the bulletin is retrieved directly
from the author's website to ensure that the information is still current.
Contact information for the authors of the original document is included
in the Security Bulletin above. If you have any questions or need further
information, please contact them directly.
Previous advisories and external security bulletins can be retrieved from:
https://www.auscert.org.au/bulletins/
===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072
Internet Email: auscert@auscert.org.au
Facsimile: (07) 3365 7031
Telephone: (07) 3365 4417 (International: +61 7 3365 4417)
AusCERT personnel answer during Queensland business hours
which are GMT+10:00 (AEST).
On call after hours for member emergencies only.
===========================================================================
-----BEGIN PGP SIGNATURE-----
Comment: http://www.auscert.org.au/render.html?it=1967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=3If/
-----END PGP SIGNATURE-----