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AUSCERT External Security Bulletin Redistribution
ESB-2020.1921
Advisory (icsa-20-154-01) ABB System 800xA
3 June 2020
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AusCERT Security Bulletin Summary
---------------------------------
Product: ABB System 800xA
Publisher: ICS-CERT
Operating System: Network Appliance
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
Increased Privileges -- Existing Account
Modify Arbitrary Files -- Existing Account
Reduced Security -- Existing Account
Resolution: Mitigation
CVE Names: CVE-2020-8473 CVE-2020-8472
Original Bulletin:
https://www.us-cert.gov/ics/advisories/icsa-20-154-01
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ICS Advisory (ICSA-20-154-01)
ABB System 800xA
Original release date: June 02, 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 7.3
o ATTENTION: Low skill level to exploit
o Vendor: ABB
o Equipment: System 800xA
o Vulnerabilities: Incorrect Default Permissions
2. RISK EVALUATION
Successful exploitation of these vulnerabilities could allow an attacker to
escalate privileges, cause system functions to stop, and corrupt user
applications.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following products of System 800xA are affected:
o OPC Server for AC 800M: Versions 6.0 and prior
o Control Builder M Professional: Versions 6.1 and prior
o MMS Server for AC 800M: Versions 6.1 and prior
o Base Software for SoftControl: Versions 6.1 and prior
o ABB System 800xA Base: Versions 6.1 and prior
3.2 VULNERABILITY OVERVIEW
3.2.1 INCORRECT DEFAULT PERMISSIONS CWE-276
Weak access control lists for system folders could allow low privileged users
to modify system and application files.
CVE-2020-8472 has been assigned to this vulnerability. A CVSS v3 base score of
5.5 has been calculated; the CVSS vector string is ( AV:L/AC:L/PR:L/UI:N/S:U/
C:N/I:N/A:H ).
3.2.2 INCORRECT DEFAULT PERMISSIONS CWE-276
An attacker who successfully exploits the weak file permissions in one of the
ABB System 800xA functions could corrupt applications by escalating privileges,
executing arbitrary code, and affecting various engineering functions.
CVE-2020-8473 has been assigned to this vulnerability. A CVSS v3 base score of
7.3 has been calculated; the CVSS vector string is ( AV:L/AC:L/PR:L/UI:R/S:U/
C:H/I:H/A:H ).
3.3 BACKGROUND
o CRITICAL INFRASTRUCTURE SECTORS: Chemical, Critical Manufacturing, Dams,
Energy, Food and Agriculture, Water and Wastewater Systems
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: Switzerland
3.4 RESEARCHER
William Knowles of Applied Risk reported these vulnerabilities to ABB.
4. MITIGATIONS
ABB recommends changing any user account passwords suspected to be known by an
unauthorized person. Interactive logon (both local and remote) is recommended
to be disabled for the service account.
The vulnerabilities in the OPC Server for AC 800M was corrected in System 800xA
6.1
In the Control Builder M Professional, MMS Server for AC 800M and Base Software
for SoftControl and ABB System 800xA Base, the vulnerabilities will be
corrected in future releases of System 800xA. These vulnerabilities are planned
to be corrected in the next release on the 6.0.3 LTS track following 6.0.3.3
Please note these vulnerabilities can only be exploited by authenticated users,
so users are recommended to ensure only authorized persons have access to user
accounts in System 800xA.
For more information please refer to ABB's Cybersecurity Advisory .
CISA recommends users take defensive measures to minimize the risk of
exploitation of these vulnerabilities. Specifically, users should:
o Follow the principle of least privilege.
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 these vulnerabilities. These
vulnerabilities are 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.
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