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AUSCERT External Security Bulletin Redistribution
ICS Advisory (ICSA-20-063-01)
4 March 2020
AusCERT Security Bulletin Summary
Operating System: Network Appliance
Impact/Access: Increased Privileges -- Existing Account
CVE Names: CVE-2020-6971
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ICS Advisory (ICSA-20-063-01)
Original release date: March 03, 2020
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
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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
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following versions of ValveLink digital valve controller software are
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
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/
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
Emerson Cybersecurity reported this vulnerability to CISA.
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
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
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:
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.
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