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AUSCERT External Security Bulletin Redistribution
Advisory (icsa-21-026-01-0) All Bachmann M1 System Processor Modules
2 July 2021
AusCERT Security Bulletin Summary
Product: Bachmann M1 System Processor Products
Operating System: Network Appliance
Impact/Access: Access Privileged Data -- Existing Account
Reduced Security -- Existing Account
CVE Names: CVE-2020-16231
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ICS Advisory (ICSA-21-026-01)
All Bachmann M1 System Processor Modules
Original release date: July 01, 2021
All information products included in https://us-cert.cisa.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
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is governed by the Traffic Light Protocol (TLP) marking in the header. For more
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1. EXECUTIVE SUMMARY
o CVSS v3 7.2
o ATTENTION: Exploitable remotely/low attack complexity
o Vendor: Bachmann Electronic, GmbH
o Equipment: All M-Base Controllers
o Vulnerability : Use of Password Hash with Insufficient Computational Effort
2. REPOSTED INFORMATION
This updated advisory is a follow-up to the advisory titled ICSA-21-026-01P All
Bachmann M1 System Processor Modules, posted to the HSIN ICS library on January
26, 2021. This advisory is now being released to the ICS webpage on
3. RISK EVALUATION
Successful exploitation of this vulnerability could allow an unauthenticated
remote attacker to gain access to the password hashes of the controller if
Security Level 4 is not in use as recommended. In the recommended Security
Level 4 setting, an authenticated remote attacker could get access to user
4. TECHNICAL DETAILS
4.1 AFFECTED PRODUCTS
o All M-Base Operating Systems and Middleware versions since MSYS v1.06.14
are affected, which include the following M1 Hardware Controllers:
MX207, MX213, MX220, MC206, MC212, MC220, MH230. This list indicates
actively supported controllers.
o MC205, MC210, MH212, ME203, CS200, MP213, MP226, MPC240, MPC265, MPC270,
MPC293, MPE270, CPC210. This list indicates End-of-Life controllers.
4.2 VULNERABILITY OVERVIEW
4.2.1 USE OF PASSWORD HASH WITH INSUFFICIENT COMPUTATIONAL EFFORT CWE-916
The affected M-Base Controllers use weak cryptography to protect device
passwords. Security Level 0 is set at default from the manufacturer, which
could allow an unauthenticated remote attacker to gain access to the password
hashes. Security Level 4 is susceptible if an authenticated remote attacker or
an unauthenticated person with physical access to the device reads and decrypts
the password to conduct further attacks.
CVE-2020-16231 has been assigned to this vulnerability. A CVSS v3 base score of
7.2 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:H/UI:N/S:U/
o CRITICAL INFRASTRUCTURE SECTORS: Energy, Transportation Systems
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: Austria
Bachmann recommends its direct users and original equipment manufacturers (OEM)
update to Version 4.49-P1, which is available under item number 00036634-90. To
obtain Version 3.95R-P8 the end user is required to contact their key account
manager or technical support agent at Bachmann. Asset owners should contact
their OEM or reseller for patches. Bachmann does not provide support directly
to asset owners. Please refer to the Bachmann Customer Information Note for
more details. The password "_pC5#3fS@Y8s" is required to access.
If asset owners are unable to update to the latest version or a patch is not
available from the OEM or reseller, Bachmann recommends the following
mitigations to be put in place:
o Update the default username and password in the default Bachmann login
handler for field operations.
o Direct users or OEMs may utilize their own login handler (e.g., LDAP,
Radius, etc.) to circumvent the default authentication handler. Security
Level 4 is still recommended for field operations.
o Restrict physical access to the device to authorized personnel only.
Default Security Level 0 within Bachmann controllers is inherently insecure and
should not be used in field operations. Security Levels 1, 2, and 3 are also
not recommended for field operations. The use of Telnet, FTP, and Console
access during field operations may result in the exploitation of inherent
vulnerabilities such as unauthenticated access or exposure of sensitive
information. Bachmann strongly recommends users apply Security Level 4, where
communication with the device is limited to TLS protected services and all
insecure services are disabled.
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.cisa.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.cisa.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.
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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