-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

===========================================================================
             AUSCERT External Security Bulletin Redistribution

                               ESB-2020.1921
                Advisory (icsa-20-154-01) ABB System 800xA
                                3 June 2020

===========================================================================

        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

- --------------------------BEGIN INCLUDED TEXT--------------------

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.

- --------------------------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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=Ua4y
-----END PGP SIGNATURE-----