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AUSCERT External Security Bulletin Redistribution
Advisory (icsa-21-159-05) Schneider Electric Modicon X80
9 June 2021
AusCERT Security Bulletin Summary
Product: Schneider Electric Modicon X80
Operating System: Network Appliance
Impact/Access: Access Confidential Data -- Remote/Unauthenticated
CVE Names: CVE-2021-22749
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ICS Advisory (ICSA-21-159-05)
Schneider Electric Modicon X80
Original release date: June 08, 2021
All information products included in https://us-cert.cisa.gov/ics are provided
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1. EXECUTIVE SUMMARY
o CVSS v3 5.3
o ATTENTION: Exploitable remotely/low attack complexity
o Vendor: Schneider Electric
o Equipment: Modicon X80
o Vulnerability: Exposure of Sensitive Information to an Unauthorized Actor
2. RISK EVALUATION
Successful exploitation of this vulnerability may result in information
disclosure to an unauthenticated remote user, which could result in an
understanding of the network architecture.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following versions of Modicon X80 are affected:
o Modicon X80 BMXNOR0200H RTU SV1.70 IR22 and prior
3.2 VULNERABILITY OVERVIEW
3.2.1 EXPOSURE OF SENSITIVE INFORMATION TO AN UNAUTHORIZED ACTOR CWE-200
This vulnerability could cause an information leak concerning the current RTU
configuration including communication parameters dedicated to telemetry when a
specially crafted HTTP request is sent to the web server of the module.
CVE-2021-22749 has been assigned to this vulnerability. A CVSS v3 base score of
5.3 has been assigned; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U/C:L/
o CRITICAL INFRASTRUCTURE SECTORS: Commercial Facilities, Critical
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: France
Chizuru Toyama, TXOne IoT/ICS Security Research Labs of Trend Micro, reported
this vulnerability to CISA.
Schneider Electric recommends users immediately apply the following mitigations
to reduce the risk of exploitation until a remediation plan is available:
o Web access service is disabled by default. Because the web server is only
necessary for specific maintenance and configuration activities, it is
advised users disable the web (HTTP) service when it is not needed through
the Ecostruxure Control Expert application.
o Set up network segmentation and implement a firewall to block all
unauthorized access to HTTP Port 80/TCP on the controllers.
o When used in an architecture including a BMXNOC module, configure the
Access Control Lists following the recommendation in the Modicon
Controllers Platform Cyber Security Reference Manual .
Additional recommended best practice:
o Change the default password used to access the device web server. Update
username and password for HTTP access rights with the "Security" link on
the Setup page. See the Modicon X80 BMXNOR0200H RTU Module User Manual .
Please see Schneider Electric's publication SEVD-2021-159-05 for more
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.
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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