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AUSCERT External Security Bulletin Redistribution
ESB-2021.3442
Advisory (icsa-21-287-01) Schneider Electric CNM
15 October 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: Schneider Electric CNM
Publisher: ICS-CERT
Operating System: Windows
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
Resolution: Mitigation
CVE Names: CVE-2021-22801
Original Bulletin:
https://us-cert.cisa.gov/ics/advisories/icsa-21-287-01
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ICS Advisory (ICSA-21-287-01)
Schneider Electric CNM
Original release date: October 14, 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 7.8
o ATTENTION: Low attack complexity
o Vendor: Schneider Electric
o Equipment: ConneXium Network Manager (CNM) Software
o Vulnerability: Improper Privilege Management
2. RISK EVALUATION
Successful exploitation of this vulnerability could allow an attacker to
execute arbitrary commands.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following versions of CNM, ethernet network management software, are
affected:
o ConneXium Network Manager: All versions
3.2 VULNERABILITY OVERVIEW
3.2.1 IMPROPER PRIVILEGE MANAGEMENT CWE-269
The affected product has an issue with privilege management, which could cause
an arbitrary command execution when the software is configured with specially
crafted event actions.
CVE-2021-22801 has been assigned to this vulnerability. A CVSS v3 base score of
7.8 has been calculated; the CVSS vector string is ( AV:L/AC:L/PR:N/UI:R/S:U/
C:H/I:H/A:H ).
3.3 BACKGROUND
o CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing, Energy
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: France
3.4 RESEARCHER
David Yesland, working with Trend Micro's Zero Day Initiative, reported this
vulnerability to CISA.
4. MITIGATIONS
Schneider Electric recommends users protect their installation with the
following:
STEP 1: Download and run the CNM Alarms Disabler Tool .
Usage: Place the disabler tool and the .cxn project file in the same directory.
In a shell prompt, and in the chosen directory, execute the following command:
o disabler -projectfile {source project filename} -resultfile {converted
project filename}
Important: The converter secures and modifies the CNM database and stores it in
a new project file. Before a database coming from an untrusted source is loaded
into CNM, users must run the converter. Note the original database is not
modified. Therefore, if the original database needs to be loaded once more, it
must be converted first.
STEP 2: Set up the "Edit Password" in the CNM software. The "Edit Mode" is
enabled by default. Users must activate the edit protection by switching to
"Run mode" before exiting the application. Please refer to the chapter "Edit
Mode" of the CNM user manual (packaged in the .iso file).
Schneider Electric also recommends users should use appropriate patching
methodologies when applying these patches to their systems. We strongly
recommend the use of back-ups and evaluating the impact of these patches in a
Test and Development environment or on an offline infrastructure. Contact
Schneider Electric's Customer Care Center if you need assistance removing a
patch.
If users choose not to apply the remediation provided above, they should
immediately apply the following mitigations to reduce the risk of exploit:
o Harden the workstation running ConneXium Network Manager (CNM) Software.
o Do not load .cxn files received from untrusted sources.
o Use session without administrator rights when it is not necessary.
For more information see Schneider Electric's security notification:
SEVD-2021-285-02
CISA recommends users take the following measures to protect themselves from
social engineering attacks:
o Only uses project files from trusted sources.
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 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.
No known public exploits specifically target this vulnerability. This
vulnerability is not exploitable remotely.
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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