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AUSCERT External Security Bulletin Redistribution
ESB-2020.0930
ICS Advisory (ICSA-20-072-02)
16 March 2020
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AusCERT Security Bulletin Summary
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Product: ABB Asset Suite
Publisher: ICS-CERT
Operating System: Network Appliance
Impact/Access: Reduced Security -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2019-18998
Original Bulletin:
https://www.us-cert.gov/ics/advisories/icsa-20-072-02
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ICS Advisory (ICSA-20-072-02)
ABB Asset Suite
Original release date: March 12, 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 7.1
o ATTENTION: Exploitable remotely/low skill level to exploit
o Vendor: ABB
o Equipment: Asset Suite
o Vulnerability: Authorization Bypass Through User-Controlled Key
2. RISK EVALUATION
Successful exploitation of this vulnerability could allow an attacker access to
unauthorized information in the application by direct resource access.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following versions of Asset Suite are affected:
o Asset Suite Versions 9.6 and prior, excluding 9.4.2.6 and 9.5.3.2
3.2 VULNERABILITY OVERVIEW
3.2.1 AUTHORIZATION BYPASS THROUGH USER-CONTROLLED KEY CWE-639
There is a flaw in the access controls used to limit user access to resources.
If an attacker knows, or were to discover, the URL for a resource they do not
have permissions to, they would be able to access the resource by browsing
directly to the URL.
CVE-2019-18998 has been assigned to this vulnerability. A CVSS v3 base score of
7.1 has been assigned; the CVSS vector string is ( AV:N/AC:L/PR:L/UI:N/S:U/C:H/
I:L/A:N ).
3.3 BACKGROUND
o CRITICAL INFRASTRUCTURE SECTORS: Energy
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: Switzerland
3.4 RESEARCHER
ABB reported this vulnerability to CISA.
4. MITIGATIONS
ABB recommends users apply the update as soon as they are able. The following
updates mitigate this vulnerability:
o Versions 9.4.2.6, 9.5.3.2, and 9.6.1
For additional information and support, please contact your local ABB service
organization. For contact information, see https://new.abb.com/contact-centers
or visit http://www.abb.com/cybersecurity
CISA recommends users take defensive measures to minimize the risk of
exploitation of this vulnerability. Specifically, users should:
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.
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.
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