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AUSCERT External Security Bulletin Redistribution
ESB-2021.3829
Advisory (icsa-21-313-04) mySCADA myDESIGNER
10 November 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: mySCADA myDESIGNER
Publisher: ICS-CERT
Operating System: Windows
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
Modify Arbitrary Files -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2021-3091
Original Bulletin:
https://us-cert.cisa.gov/ics/advisories/icsa-21-313-04
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ICS Advisory (ICSA-21-313-04)
mySCADA myDESIGNER
Original release date: November 09, 2021
Legal Notice
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
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://us-cert.cisa.gov/tlp/ .
1. EXECUTIVE SUMMARY
o CVSS v3 7.3
o ATTENTION: Low attack complexity
o Vendor: mySCADA
o Equipment: myDESIGNER
o Vulnerability: Relative Path Traversal
2. RISK EVALUATION
Successful exploitation of this vulnerability could allow for remote code
execution.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following versions of mySCADA myDESIGNER project creation software are
affected:
o myDESIGNER: Versions 8.20.0 and prior
3.2 VULNERABILITY OVERVIEW
3.2.1 RELATIVE PATH TRAVERSAL CWE-23
The affected product fails to properly validate contents of an imported project
file, which may make the product vulnerable to a path traversal payload. This
vulnerability may allow an attacker to plant files on the file system in
arbitrary locations or overwrite existing files, resulting in remote code
execution.
CVE-2021-3091 has been assigned to this vulnerability. A CVSS v3 base score of
7.3 has been assigned; the CVSS vector string is ( AV:L/AC:L/PR:N/UI:R/S:U/C:L/
I:H/A:H ).
3.3 BACKGROUND
o CRITICAL INFRASTRUCTURE SECTORS: Energy, Food and Agriculture,
Transportation Systems, Water and Wastewater Systems
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: Czech Republic
3.4 RESEARCHER
Michael Heinzl reported this vulnerability to CISA.
4. MITIGATIONS
mySCADA recommends users apply update v8.22.0 or later .
Upgrade note: RFID card access has been redesigned. If a user uses an RFID card
to login, the user will need to re-enter the password for all RFID users in the
project after the update is applied.
CISA recommends users take the following measures to protect themselves from
social engineering attacks:
o Do not click web links or open unsolicited attachments in email messages.
o Refer to Recognizing and Avoiding Email Scams for more information on
avoiding email scams.
o Refer to Avoiding Social Engineering and Phishing Attacks for more
information on social engineering attacks.
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 VPNs may have vulnerabilities and should be
updated to the most current version available. Also recognize VPN is only
as secure as its 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.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
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. This
vulnerability is 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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