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AUSCERT External Security Bulletin Redistribution
Advisory (icsa-21-259-02) Schneider Electric EcoStruxure and SCADAPack
17 September 2021
AusCERT Security Bulletin Summary
Product: Schneider Electric EcoStruxure
Operating System: Network Appliance
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
CVE Names: CVE-2021-22796
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ICS Advisory (ICSA-21-259-02)
Schneider Electric EcoStruxure and SCADAPack
Original release date: September 16, 2021
All information products included in https://us-cert.cisa.gov/ics are provided
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1. EXECUTIVE SUMMARY
o CVSS v3 7.8
o ATTENTION: Low attack complexity
o Vendor: Schneider Electric
o Equipment: EcoStruxure Control Expert, EcoStruxure Process Expert,
SCADAPack RemoteConnect for x70
o Vulnerability: Path Traversal
2. RISK EVALUATION
Successful exploitation of this vulnerability could result in code execution on
the engineering workstation.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following products and versions are affected:
o EcoStruxure Control Expert: All versions, including former Unity Pro
o EcoStruxure Process Expert: All versions, including former HDCS
o SCADAPack RemoteConnect for x70: All versions
3.2 VULNERABILITY OVERVIEW
3.2.1 IMPROPER LIMITATION OF A PATHNAME TO A RESTRICTED DIRECTORY ('PATH
When a malicious project file is loaded on the engineering workstation
software, it deploys a malicious script to execute arbitrary code in
CVE-2021-22796 has been assigned to this vulnerability. A CVSS v3 base score of
7.8 has been calculated; the CVSS vector string is ( AV:L/AC:L/PR:N/UI:R/S:U/
o CRITICAL INFRASTRUCTURE SECTORS: Commercial Facilities, Energy, Food and
Agriculture, Government Facilities, Transportation Systems, Water and
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: France
kimiya, working with Trend Micro Zero's Day Initiative, reported this
vulnerability to CISA.
Schneider Electric is establishing a remediation plan for future versions of
the affected products that will include a fix for this vulnerability. CISA will
update this document when the remediations are available.
Schneider Electric recommends users immediately apply the following mitigations
to reduce the risk of exploitation:
o Store project files in a secure storage location and limit access to the
files to only trusted users.
o When exchanging the files over the network, use secure communication
o Harden the workstations running EcoStruxure Control Expert, EcoStruxure
Process Expert, or SCADAPack RemoteConnect.
o Compute a checksum on all project files and check the consistency of the
checksum to verify the integrity before usage.
o Start the software without administrator rights to prevent the copying of
extracted files in critical system folders.
Users still using Unity Pro should strongly consider migrating to EcoStruxure
Control Expert. Please contact the local Schneider Electric technical support
for more information.
To stay informed of all updates, including details on affected products and
remediation plans, subscribe to Schneider Electric's security notification
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
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.
CISA also 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.
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:
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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