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AUSCERT External Security Bulletin Redistribution
ESB-2020.4268
Advisory (icsa-20-336-01) Schneider Electric EcoStruxure
Operator Terminal Expert runtime (Vijeo XD)
2 December 2020
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AusCERT Security Bulletin Summary
---------------------------------
Product: Schneider Electric EcoStruxure Operator Terminal Expert
Publisher: ICS-CERT
Operating System: Windows
Impact/Access: Increased Privileges -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2020-7544
Original Bulletin:
https://us-cert.cisa.gov/ics/advisories/icsa-20-336-01
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ICS Advisory (ICSA-20-336-01)
Schneider Electric EcoStruxure Operator Terminal Expert runtime (Vijeo XD)
Original release date: December 01, 2020
1. EXECUTIVE SUMMARY
* CVSS v3 7.4
* Vendor: Schneider Electric
* Equipment: EcoStruxure Operator Terminal Expert
* Vulnerability: Improper Privilege Management
2. RISK EVALUATION
Successful exploitation of this vulnerability may allow unauthorized command
execution by a local user of the Windows engineering workstation, which could
result in loss of availability, confidentiality, and integrity of the
workstation where EcoStruxure Operator Terminal Expert runtime is installed.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
Schneider Electric reports the vulnerability affects the following EcoStruxure
Operator Terminal Expert products:
* EcoStruxure Operator Terminal Expert Runtime 3.1 Service Pack 1A and prior
installed on:
+ Windows PC using legacy BIOS
+ Harmony iPC (HMIG5U, HMIG5U2) using legacy BIOS
NOTE: Windows PCs using UEFI are not impacted by this vulnerability.
3.2 VULNERABILITY OVERVIEW
3.2.1 IMPROPER PRIVILEGE MANAGEMENT CWE-269
An improper privilege management vulnerability exists that could cause
privilege escalation on the workstation when interacting directly with a driver
installed by the runtime software of EcoStruxure Operator Terminal Expert.
CVE-2020-7544 has been assigned to this vulnerability. A CVSS v3 base score of
7.4 has been calculated; the CVSS vector string is (AV:L/AC:H/PR:N/UI:N/S:U/C:H
/I:H/A:H).
3.3 BACKGROUND
* CRITICAL INFRASTRUCTURE SECTORS: Commercial Facilities, Energy, Food and
Agriculture, Government Facilities, Transportation Systems, Water and W
astewater Systems
* COUNTRIES/AREAS DEPLOYED: Worldwide
* COMPANY HEADQUARTERS LOCATION: France
3.4 RESEARCHER
Lasse Trolle Borup (Danish Cyber Defence) reported this vulnerability to
Schneider Electric.
4. MITIGATIONS
Schneider Electric has prepared Version 3.1 Service Pack 1B of the EcoStruxure
Operator Terminal Expert product with a fix for this vulnerability. This fix is
also available through Schneider Electric Software Update (SESU)
If users choose not to apply the remediation provided above, they should
immediately apply the following mitigations to reduce the risk of exploit:
* Use EcoStruxure Operator Terminal Expert runtime software only on a trusted
workstation.
* Harden workstation following the best cybersecurity practices (antivirus,
updated operating systems, strong password policies, application white
listing software, etc.) by following Schneider Electric?s best practices
guidelines.
* Use Windows PC with UEFI technology. Users can identify if their PC uses
the UEFI technology by using the following system command: msinfo32.exe
provided by Microsoft Windows. This command provides the system
information. The section BIOS mode displays either ?UEFI? or ?LEGACY?.
+ If the value is UEFI, the PC is not vulnerable, if the value is LEGACY
then the PC is vulnerable.
For further information please refer to SEVD-2020-315-02.
CISA recommends users take defensive measures to minimize the risk of
exploitation of this vulnerability. Specifically, users should:
* Minimize network exposure for all control system devices and/or systems,
and ensure that they are not accessible from the Internet.
* Locate control system networks and remote devices behind firewalls, and
isolate them from the business network.
* When remote access is required, use secure methods, such as Virtual Private
Networks (VPNs), recognizing that VPNs may have vulnerabilities and should
be updated to the most current version available. Also recognize that VPN
is only as secure as the 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.
CISA also recommends users take the following measures to protect themselves
from social engineering attacks:
* Do not click web links or open unsolicited attachments in email messages.
* Refer to Recognizing and Avoiding Email Scams for more information on
avoiding email scams.
* 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. High skill level is needed to
exploit.
Contact Information
For any questions related to this report, please contact the CISA at:
Email: CISAservicedesk@cisa.dhs.gov
Toll Free: 1-888-282-0870
For industrial control systems cybersecurity information: https://
us-cert.cisa.gov/ics
or incident reporting: https://us-cert.cisa.gov/report
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.
This product is provided subject to this Notification and this Privacy & Use
policy.
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