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AUSCERT External Security Bulletin Redistribution
ESB-2023.2257
ICS Advisory | ICSA-23-108-02 Schneider Electric Easy UPS
Online Monitoring Software
20 April 2023
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AusCERT Security Bulletin Summary
---------------------------------
Product: Schneider Electric Easy UPS Online Monitoring Software
Publisher: ICS-CERT
Operating System: Windows
Resolution: Patch/Upgrade
CVE Names: CVE-2023-29413 CVE-2023-29412 CVE-2023-29411
Original Bulletin:
https://www.cisa.gov/news-events/ics-advisories/icsa-23-108-02
Comment: CVSS (Max): 9.8 CVE-2023-29412 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
CVSS Source: ICS-CERT
Calculator: https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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ICS Advisory (ICSA-23-108-02)
Schneider Electric Easy UPS Online Monitoring Software
Release Date
April 18, 2023
1. EXECUTIVE SUMMARY
o CVSS v3 9.8
o ATTENTION: Exploitable remotely/low attack complexity
o Vendor: Schneider Electric
o Equipment: APC Easy UPS Online Monitoring Software, Schneider Electric Easy
UPS Online Monitoring Software
o Vulnerabilities: Missing Authentication for Critical Function, Improper
Handling of Case Sensitivity
2. RISK EVALUATION
Successful exploitation of these vulnerabilities could result in remote code
execution, escalation of privileges, or authentication bypass, which then
result in malicious web code execution or loss of device functionality.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following versions of Easy UPS Online Monitoring Software for Windows 10,
11, Windows Server 2016, 2019, 2022 are affected:
o APC Easy UPS Online Monitoring Software: Version V2.5-GA-01-22320 and prior
o Schneider Electric Easy UPS Online Monitoring Software: Version
V2.5-GA-01-22320 and prior
3.2 VULNERABILITY OVERVIEW
3.2.1 MISSING AUTHENTICATION FOR CRITICAL FUNCTION CWE-306
A vulnerability exists that could allow changes to administrative credentials,
leading to potential remote code execution without requiring prior
authentication on the Java RMI interface.
CVE-2023-29411 has been assigned to this vulnerability. A CVSS v3 base score of
9.8 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U/
C:H/I:H/A:H ).
3.2.2 IMPROPER HANDLING OF CASE SENSITIVITY CWE-78
A vulnerability exists that could cause remote code execution when manipulating
internal methods through Java RMI interface.
CVE-2023-29412 has been assigned to this vulnerability. A CVSS v3 base score of
9.8 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U/
C:H/I:H/A:H ).
3.2.3 MISSING AUTHENTICATION FOR CRITICAL FUNCITON CWE-306
A vulnerability exists that could cause a denial-of-service condition when
accessed by an unauthenticated user on the Schneider UPS Monitor service.
CVE-2023-29413 has been assigned to this vulnerability. A CVSS v3 base score of
7.5 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U/
C:N/I:N/A:H ).
3.3 BACKGROUND
o CRITICAL INFRASTRUCTURE SECTORS: Multiple
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: France
3.4 RESEARCHER
Esjay, working with Trend Micro Zero Day Initiative, and Nicholas Miles,
working with Tenable, reported these vulnerabilities to Schneider Electric and
CISA.
4. MITIGATIONS
Schneider Electric recommends users update their affected devices to the
following versions:
o APC Easy UPS Online Monitoring Software: Version 2.6-GA
o Schneider Electric Easy UPS Online Monitoring Software: Version 2.6-GS
Schneider Electric recommends that users use appropriate patching methodologies
when applying these patches to their systems and impact evaluate these patches
in a test, development, or offline infrastructure environment. Schneider
Electric strongly recommends the use of backups.
Users can contact Schneider Electric's Customer Care Center for additional
assistance.
Schneider Electric strongly recommends users follow cybersecurity industry best
practices, including:
o Locating control and safety system networks and remote devices behind
firewalls and isolating them from the business network.
o Installing physical controls to help prevent unauthorized users from
accessing industrial control and safety systems, components, peripheral
equipment, and networks.
o Placing all controllers in locked cabinets, and do not leave them in the
"Program" mode.
o Only connecting programming software to the network intended for that
device.
o Scanning all methods of mobile data exchange with the isolated network
before use in the terminals or nodes connected to these networks.
o Properly sanitizing mobile devices that have connected to another network
before connecting to the intended network.
o Minimizing network exposure for all control system devices and systems and
ensure that they are not accessible from the internet.
o Using secure methods, such as virtual private networks (VPNs), when remote
access is required.
o For more information, refer to the Schneider Electric Recommended
Cybersecurity Best Practices document.
For more information, see Schneider Electric security notification
SEVD-2023-101-04 .
CISA recommends users take defensive measures to minimize the risk of
exploitation of these vulnerabilities.
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 at cisa.gov/ics . Several CISA products detailing cyber
defense best 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 at cisa.gov/ics in the technical information paper,
ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation
Strategies .
Organizations observing suspected malicious activity should follow established
internal procedures and report findings to CISA for tracking and correlation
against other incidents.
No known public exploits specifically target these vulnerabilities.
Related Advisories
Apr 18, 2023
ICS Advisory | ICSA-23-108-01
Omron CS/CJ Series
Apr 13, 2023
ICS Advisory | ICSA-23-103-06
Siemens SIPROTEC 5 Devices
Apr 13, 2023
ICS Advisory | ICSA-23-103-09
Siemens SCALANCE XCM332
Apr 13, 2023
ICS Advisory | ICSA-23-103-12
Siemens Polarion ALM
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