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AUSCERT External Security Bulletin Redistribution
ESB-2021.0798
(icsa-21-063-02) Schneider Electric EcoStruxure Building
Operation (EBO) Security Update
5 March 2021
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: Schneider Electric EcoStruxure Building Operation (EBO)
Publisher: ICS-CERT
Operating System: Windows
Network Appliance
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
Modify Arbitrary Files -- Existing Account
Cross-site Scripting -- Remote with User Interaction
Denial of Service -- Existing Account
Access Confidential Data -- Remote with User Interaction
Unauthorised Access -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2020-28210 CVE-2020-28209 CVE-2020-7573
CVE-2020-7572 CVE-2020-7571 CVE-2020-7570
CVE-2020-7569
Original Bulletin:
https://us-cert.cisa.gov/ics/advisories/icsa-21-063-02
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ICS Advisory (ICSA-21-063-02)
Schneider Electric EcoStruxure Building Operation (EBO)
Original release date: March 04, 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 6.7
o ATTENTION: Exploitable remotely/low skill level to exploit
o Vendor: Schneider Electric
o Equipment: EcoStruxure Building Operation
o Vulnerabilities: Unrestricted Upload of File with Dangerous Type,
Cross-site Scripting, Improper Restriction of XML External Entity
Reference, Improper Access Control, Windows Unquoted Search Path
2. RISK EVALUATION
Successful exploitation of these vulnerabilities may allow unauthorized file
uploads and command execution by a remote user, which could result in loss of
availability, confidentiality, and integrity of the workstation.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
Schneider Electric reports these vulnerabilities affect the following
EcoStruxure Building Operation products:
o WebReports v1.9 - v3.1
o WebStation v2.0 - v3.1
o Enterprise Server installer v1.9 - v3.1
o Enterprise Central installer v2.0 - v3.1
Note: Please see SEVD-2020-315-04 to see which vulnerabilities affect each
specific product.
3.2 VULNERABILITY OVERVIEW
3.2.1 UNRESTRICTED UPLOAD OF FILE WITH DANGEROUS TYPE CWE-434
An unrestricted upload of a file with dangerous type vulnerability could allow
an authenticated remote user to upload arbitrary files due to incorrect
verification of user supplied files and achieve remote code execution.
CVE-2020-7569 has been assigned to this vulnerability. A CVSS v3 base score of
4.6 has been calculated; the CVSS vector string is ( AV:N/AC:H/PR:L/UI:R/S:U/
C:L/I:L/A:L ).
3.2.2 CROSS-SITE SCRIPTING CWE-79
An improper neutralization of an input during webpage generation vulnerability
could allow an authenticated remote user to inject arbitrary web script or HTML
due to incorrect sanitization of user-supplied data and achieve a stored
cross-site scripting attack against other WebReport users.
CVE-2020-7570 has been assigned to this vulnerability. A CVSS v3 base score of
6.4 has been calculated; the CVSS vector string is ( AV:N/AC:H/PR:L/UI:N/S:U/
C:H/I:L/A:L ).
3.2.3 CROSS-SITE SCRIPTING CWE-79
Multiple improper neutralizations of an input during webpage generation
vulnerabilities could allow a remote attacker to inject arbitrary web script or
HTML due to incorrect sanitization of user supplied data and achieve a
reflected cross-site scripting attack against other WebReport users.
CVE-2020-7571 has been assigned to this vulnerability. A CVSS v3 base score of
6.1 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:R/S:C/
C:L/I:L/A:N ).
3.2.4 IMPROPER RESTRICTION OF XML EXTERNAL ENTITY REFERENCE CWE-611
An improper restriction of XML external entity reference vulnerability could
allow an authenticated remote user to inject arbitrary XML code and obtain
disclosure of confidential data, cause a denial-of-service condition, or
execute server-side request forgery due to improper configuration of the XML
parser.
CVE-2020-7572 has been assigned to this vulnerability. A CVSS v3 base score of
6.7 has been calculated; the CVSS vector string is ( AV:N/AC:H/PR:L/UI:R/S:U/
C:H/I:L/A:H ).
3.2.5 IMPROPER ACCESS CONTROL CWE-284
An improper access control vulnerability could allow a remote attacker access
to restricted web resources due to improper access control.
CVE-2020-7573 has been assigned to this vulnerability. A CVSS v3 base score of
5.0 has been calculated; the CVSS vector string is ( AV:N/AC:H/PR:N/UI:R/S:U/
C:L/I:L/A:L ).
3.2.6 UNQUOTED SEARCH PATH OR ELEMENT CWE-428
An unquoted search path vulnerability could allow any local Windows user with
write permissions on at least one of the subfolders of the connect agent
service binary path to gain the privilege of the user who started the service.
By default, the Enterprise Server and Enterprise Central is always installed at
a location requiring Administrator privileges, so this vulnerability is only
valid if the application has been installed on a non-secure location.
CVE-2020-28209 has been assigned to this vulnerability. A CVSS v3 base score of
2.0 has been calculated; the CVSS vector string is ( AV:L/AC:L/PR:H/UI:R/S:U/
C:L/I:N/A:N ).
3.2.7 CROSS-SITE SCRIPTING CWE-79
An improper neutralization of an input during webpage generation vulnerability
could allow an attacker to inject HTML and JavaScript code into the user's
browser.
CVE-2020-28210 has been assigned to this vulnerability. A CVSS v3 base score of
4.3 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:R/S:U/
C:N/I:L/A:N ).
3.3 BACKGROUND
o CRITICAL INFRASTRUCTURE SECTORS: Commercial Facilities, Energy, Food and
Agriculture, Government Facilities, Transportation Systems, Water and
Wastewater Systems
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: France
3.4 RESEARCHER
Luis Vazquez, Francisco Palma, and Diego Leon of Zerolynx in coordination with
INCIBE and Alessandro Bosco, Luca Di Giuseppe, Alessandro Sabetta, and
Massimiliano Brolli of TIM Security Red Team Research reported these
vulnerabilities to Schneider Electric.
4. MITIGATIONS
Schneider Electric recommends users upgrade to Version 3.2 of EBO as it is not
impacted by any of these vulnerabilities. For assistance in upgrading, contact
Schneider Electric Customer Care Center or your Schneider Electric
representative.
For versions prior to 3.2, fixes are now available in the form of a hotfix
patch. Please refer to SEVD-2020-315-02 for specific information about how to
apply the patch.
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 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:
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 these vulnerabilities.
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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