Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256
===========================================================================
AUSCERT External Security Bulletin Redistribution
ESB-2020.0776
ICS Advisory (ICSA-20-063-01)
4 March 2020
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: ValveLink
Publisher: ICS-CERT
Operating System: Network Appliance
Impact/Access: Increased Privileges -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2020-6971
Original Bulletin:
https://www.us-cert.gov/ics/advisories/icsa-20-063-01
- --------------------------BEGIN INCLUDED TEXT--------------------
ICS Advisory (ICSA-20-063-01)
Emerson ValveLink
Original release date: March 03, 2020
Legal Notice
All information products included in https://us-cert.gov/ics are provided"as
is" for informational purposes only. The Department of Homeland Security (DHS)
does not provide any warranties of any kind regarding any information contained
within. DHS does not endorse any commercial product or service, referenced in
this product or otherwise. Further dissemination of this product is governed by
the Traffic Light Protocol (TLP) marking in the header. For more information
about TLP, see https://www.us-cert.gov/tlp/ .
1. EXECUTIVE SUMMARY
o CVSS v3 7.8
o ATTENTION: Low skill level to exploit
o Vendor: Emerson
o Equipment: ValveLink
o Vulnerability: Improper Access Control
2. RISK EVALUATION
Successful exploitation of this vulnerability could allow arbitrary code
execution.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following versions of ValveLink digital valve controller software are
affected:
o ValveLink, v12.0.264 to v13.4.118
3.2 VULNERABILITY OVERVIEW
3.2.1 IMPROPER ACCESS CONTROL CWE-284
A vulnerability in the ValveLink software may allow a local, unprivileged,
trusted insider to escalate privileges due to insecure configuration
parameters.
CVE-2020-6971 has been assigned to this vulnerability. A CVSS v3 base score of
7.8 has been calculated; the CVSS vector string is ( AV:L/AC:L/PR:L/UI:N/S:U/
C:H/I:H/A:H ).
3.3 BACKGROUND
o CRITICAL INFRASTRUCTURE SECTORS: Chemical, Critical Manufacturing, Dams,
Energy, Food and Agriculture, Healthcare and Public Health, Nuclear
Reactors, Materials and Waste, Transportation Systems, Water
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: United States
3.4 RESEARCHER
Emerson Cybersecurity reported this vulnerability to CISA.
4. MITIGATIONS
Emerson recommends users upgrade the affected products listed below:
ValveLink, v12.0.264 to v13.4.118: Apply upgrade for ValveLink v13.4.123 or
higher.
Software upgrades are available to users by contacting an Emerson Impact
Partner. AMS, Ovation, and DeltaV users with ValveLink can download the update
through the Guardian Support Portal .
To limit exposure to this vulnerability, Emerson recommends immediately
deploying and configuring the latest version of ValveLink as described in the
ValveLink installation guide .
CISA recommends users take defensive measures to minimize the risk of
exploitation of this vulnerability. Specifically, users should:
o Practice principle of least privilege .
o Minimize network exposure for all control system devices and/or systems,
and ensure that they are not accessible from the Internet .
o Locate control system networks and remote devices behind firewalls, and
isolate them from the business network.
o When remote access is required, use secure methods, such as Virtual Private
Networks (VPNs), recognizing that VPNs may have vulnerabilities and should
be updated to the most current version available. Also recognize that VPN
is only as secure as the connected devices.
CISA reminds organizations to perform proper impact analysis and risk
assessment prior to deploying defensive measures.
CISA also provides a section for control systems security recommended practices
on the ICS webpage on us-cert.gov . Several recommended practices are available
for reading and download, including Improving Industrial Control Systems
Cybersecurity with Defense-in-Depth Strategies .
Additional mitigation guidance and recommended practices are publicly available
on the ICS webpage on us-cert.gov in the Technical Information Paper,
ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation
Strategies .
Organizations observing any suspected malicious activity should follow their
established internal procedures and report their findings to CISA for tracking
and correlation against other incidents.
No known public exploits specifically target this vulnerability. This
vulnerability is not exploitable remotely.
For any questions related to this report, please contact the CISA at:
Email: CISAservicedesk@cisa.dhs.gov
Toll Free: 1-888-282-0870
CISA continuously strives to improve its products and services. You can help by
choosing one of the links below to provide feedback about this product.
- --------------------------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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=8Yvk
-----END PGP SIGNATURE-----