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AUSCERT External Security Bulletin Redistribution
ESB-2021.2406
Advisories (icsa-21-194-01 & icsa-21-194-02) Schneider Electric Product
Advisories (C-Bus Toolkit, SCADApack RTU, Modicon
Controllers, and Software)
15 July 2021
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: C-Bus Toolkit
SCADApack RTU
Modicon Controllers
EcoStruxure Control Expert
Publisher: ICS-CERT
Operating System: Network Appliance
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
Provide Misleading Information -- Remote/Unauthenticated
Unauthorised Access -- Remote/Unauthenticated
Reduced Security -- Remote/Unauthenticated
Access Confidential Data -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2021-22784 CVE-2021-22782 CVE-2021-22781
CVE-2021-22780 CVE-2021-22779 CVE-2021-22778
CVE-2020-12525
Original Bulletin:
https://us-cert.cisa.gov/ics/advisories/icsa-21-194-01
https://us-cert.cisa.gov/ics/advisories/icsa-21-194-02
Comment: This bulletin contains two (2) ICS-CERT security advisories.
- --------------------------BEGIN INCLUDED TEXT--------------------
ICS Advisory (ICSA-21-194-01)
Schneider Electric C-Bus Toolkit
Original release date: July 13, 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 6.5
o ATTENTION: Exploitable remotely/low attack complexity
o Vendor: Schneider Electric
o Equipment: C-Bus Toolkit
o Vulnerability: Missing Authentication for Critical Function
2. RISK EVALUATION
Successful exploitation of this vulnerability could allow an attacker to enable
remote access to the system.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following versions of C-Bus Toolkit are affected:
o C-Bus Toolkit Versions 1.15.8 and prior
3.2 VULNERABILITY OVERVIEW
3.2.1 MISSING AUTHENTICATION FOR CRITICAL FUNCTION CWE-306
An improper authentication issue exists and could allow an attacker to use a
crafted webpage that can enable remote access to the system.
CVE-2021-22784 has been assigned to this vulnerability. A CVSS v3 base score of
6.5 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:R/S:U/
C:N/I:H/A:N ).
3.3 BACKGROUND
o CRITICAL INFRASTRUCTURE SECTORS: Commercial Facilities
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: France
3.4 RESEARCHER
rgod working with Trend Micro's Zero Day Initiative reported this vulnerability
to CISA.
4. MITIGATIONS
Schneider Electric recommends users to update to Version 1.15.9 or later. Note:
A reboot will be needed after the update.
If users are unable to update, Schneider Electric recommends the following
workarounds:
o Use an allow list for this application
o Turn on the computer's firewall
o Use an antivirus program
o Secure the computer to prevent unauthorized personnel from accessing the
computer
See Schneider Electric's security notification SEVD-2021-194-04 for more
information.
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 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:
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:
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.
- -------------------------------------------------------------------------------
ICS Advisory (ICSA-21-194-02)
Schneider Electric SCADApack RTU, Modicon Controllers, and Software
Original release date: July 13, 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 8.6
o ATTENTION: Exploitable remotely/low attack complexity
o Vendor : Schneider Electric
o Equipment : EcoStruxure Control Expert, EcoStruxure Process Expert,
SCADAPack RemoteConnect x70, SCADAPack x70 RTUs, and Modicon M580 and M340
control products
o Vulnerabilities : Insufficiently Protected Credentials, Authentication
Bypass by Spoofing, Deserialization of Untrusted Data, Missing Encryption
of Sensitive Data.
2. RISK EVALUATION
Successful exploitation of these vulnerabilities may allow arbitrary code
execution and loss of confidentiality and integrity of the project file.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
Schneider Electric reports these vulnerabilities affect the following control
products:
o EcoStruxure Control Expert, all versions prior to v15.0 SP1
Including all versions of Unity Pro (former name of EcoStruxure Control
Expert)
o EcoStruxure Control Expert v15.0 SP1
o EcoStruxure Process Expert, all versions
Including all versions of EcoStruxure Hybrid DCS (former name of
EcoStruxure Process Expert)
o SCADAPack RemoteConnect for x70, all versions
o SCADAPack 470, 474, 570, 574, and 575 RTUs, all versions
o Modicon M580 CPU (part numbers BMEP* and BMEH*), all versions
o Modicon M340 CPU (part numbers BMXP34*), all versions
Please note not all the vulnerabilities listed below affect all the products
above. See SEVD-2021-194-01 to see how they correlate.
3.2 VULNERABILITY OVERVIEW
3.2.1 INSUFFICIENTLY PROTECTED CREDENTIALS CWE-522
An insufficiently protected credentials vulnerability exists that could cause
protected derived function blocks to be read or modified by unauthorized users
when accessing a project file.
CVE-2021-22778 has been assigned to this vulnerability. A CVSS v3 base score of
8.6 has been calculated; the CVSS vector string is ( AV:L/AC:L/PR:N/UI:R/S:C/
C:H/I:H/A:H ).
3.2.2 AUTHENTICATION BYPASS BY SPOOFING CWE-290
An authentication bypass by spoofing vulnerability exists that could cause
unauthorized access in read and write mode to the controller by spoofing the
Modbus communication between the engineering software and the controller.
CVE-2021-22779 has been assigned to this vulnerability. A CVSS v3 base score of
8.1 has been calculated; the CVSS vector string is ( AV:N/AC:H/PR:N/UI:N/S:U/
C:H/I:H/A:H ).
3.2.3 DESERIALIZATION OF UNTRUSTED DATA CWE-502
M&M Software fdtCONTAINER component in versions below 3.5.20304.x and between
3.6 and 3.6.20304.x is vulnerable to deserialization of untrusted data in its
project storage.
Note: This vulnerability could cause local code execution on the engineering
workstation when a malicious project file is loaded into the engineering
software.
CVE-2020-12525 has been assigned to this vulnerability. A CVSS v3 base score of
7.3 has been calculated; the CVSS vector string is ( AV:L/AC:L/PR:L/UI:R/S:U/
C:H/I:H/A:H ).
3.2.4 INSUFFICIENTLY PROTECTED CREDENTIALS CWE-522
An insufficiently protected credentials vulnerability exists that could cause
unauthorized access to a project file protected by a password when this file is
shared with untrusted sources. An attacker may bypass the password protection
and be able to view and modify a project file.
CVE-2021-22780 has been assigned to this vulnerability. A CVSS v3 base score of
7.1 has been calculated; the CVSS vector string is ( AV:L/AC:L/PR:L/UI:N/S:U/
C:H/I:H/A:N ).
3.2.5 INSUFFICIENTLY PROTECTED CREDENTIALS CWE-522
An insufficiently protected credentials vulnerability exists that could cause a
leak of SMTP credentials used for mailbox authentication when an attacker can
access a project file.
CVE-2021-22781 has been assigned to this vulnerability. A CVSS v3 base score of
6.2 has been calculated; the CVSS vector string is ( AV:L/AC:L/PR:N/UI:N/S:U/
C:H/I:N/A:N ).
3.2.6 MISSING ENCRYPTION OF SENSITIVE DATA CWE-311
A missing encryption of sensitive data vulnerability exists that could cause an
information leak allowing disclosure of network and process information,
credentials, or intellectual property when an attacker can access a project
file.
CVE-2021-22782 has been assigned to this vulnerability. A CVSS v3 base score of
6.2 has been calculated; the CVSS vector string is ( AV:L/AC:L/PR:N/UI:N/S:U/
C:H/I:N/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
Kai Wang (Fortinet's FortiGuard Labs), Andrey Muravitsky (Kaspersky), Gal
Kauffman (Armis), Nicholas Miles (Tenable), Li Wei (Friday Lab - Bolean Tech),
Maxim Tumakov (Kaspersky), Kai Wang (Codesafe Team of Legendsec at Qi'anxin
Group), and Artem Zinenko (Kaspersky) reported these vulnerabilities to
Schneider Electric.
4. MITIGATIONS
Schneider Electric provides detailed mitigation information for each of the
affected products in their own advisory, for more information about these
issues, please refer to the original Schneider Electric publication
SEVD-2021-194-01 .
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 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 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 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 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.
- --------------------------END INCLUDED TEXT--------------------
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