Schneider Electric Modicon M340 and BMXNOE0100/0110, BMXNOR0200H Exposure of Sensitive Information to an Unauthorized Actor (CVE-2024-12142)

high Tenable OT Security Plugin ID 502859

Synopsis

The remote OT asset is affected by a vulnerability.

Description

CWE-200: Exposure of Sensitive Information to an Unauthorized Actor vulnerability exists that could cause information disclosure of restricted web page, modification of web page and denial of service when specific web pages are modified and restricted functions are invoked.

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Solution

The following text was originally created by the Cybersecurity and Infrastructure Security Agency (CISA). The original can be found at CISA.gov.

Schneider Electric has identified the following specific workarounds and mitigations users can apply to reduce risk:

BMXNOR0200H: Version SV1.70IR26 of BMXNOR0200H includes a fix for this vulnerability and is available for download.

BMXNOE0100 (Modbus/TCP Ethernet Modicon M340 module): Version SV3.60 of BMXNOE0100 includes a fix for this vulnerability and is available for download.

BMXNOE0110 (Modbus/TCP Ethernet Modicon M340 FactoryCast module): Version SV6.80 of BMXNOE0110 includes a fix for this vulnerability and is available for download.

Users should use appropriate patching methodologies when applying these patches to their systems. Schneider Electric strongly recommends 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 for assistance removing a patch.

Schneider Electric is establishing a remediation plan for all future versions of Modicon M340 processors BMXP34* that will include a fix for this vulnerability. They will provide an update when the remediation is available. Until then, users should immediately apply the following mitigations to reduce the risk of exploit:

- Set up network segmentation and implement a firewall to block all unauthorized access to FTP Port 21/TCP on the devices.
- Disable FTP service via EcoStruxureTM Control Expert. This is disabled by default when a new application is created.
- Disable Web server service via EcoStruxureTM Control Expert. This is disabled by default when a new application is created.
- Configure the Access Control List following the recommendation on the "Modicon Controllers System Cybersecurity"

Schneider Electric strongly recommends the following industry cybersecurity best practices.

- Locate control and safety system networks and remote devices behind firewalls and isolate them from the business network.
- Install physical controls so no unauthorized personnel can access your industrial control and safety systems, components, peripheral equipment, and networks.
- Place all controllers in locked cabinets and never leave them in the "Program" mode.
- Never connect programming software to any network other than the network intended for that device.
- Scan all methods of mobile data exchange with the isolated network such as CDs, USB drives, etc. before use in the terminals or any node connected to these networks.
- Never allow mobile devices that have connected to any other network besides the intended network to connect to the safety or control networks without proper sanitation.
- Minimize network exposure for all control system devices and systems and ensure that they are not accessible from the Internet.
- When remote access is required, use secure methods, such as virtual private networks (VPNs). Recognize that VPNs may have vulnerabilities and should be updated to the most current version available. Also, understand that VPNs are only as secure as the connected devices.

For more information refer to the Schneider Electric Recommended Cybersecurity Best Practices document.

For more information, see Schneider Electric security notification "SEVD-2025-014-05 Web Server on Modicon M340 and BMXNOE0100/0110, BMXNOR0200H communication modules"

Plugin Details

Severity: High

ID: 502859

Version: 1.3

Type: remote

Family: Tenable.ot

Published: 2/18/2025

Updated: 9/15/2025

Supported Sensors: Tenable OT Security

Risk Information

VPR

Risk Factor: Medium

Score: 4.7

CVSS v3

Risk Factor: High

Base Score: 8.6

Temporal Score: 7.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

CVSS v4

Risk Factor: High

Base Score: 8.8

Threat Score: 6.8

Threat Vector: CVSS:4.0/E:U

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N

Vulnerability Information

CPE: cpe:/o:schneider-electric:bmxnoe0100_firmware, cpe:/o:schneider-electric:bmxnoe0110_firmware, cpe:/o:schneider-electric:bmxnor0200h_firmware, cpe:/o:schneider-electric:modicon_m340_series_firmware

Required KB Items: Tenable.ot/Schneider

Exploit Ease: No known exploits are available

Patch Publication Date: 1/14/2025

Vulnerability Publication Date: 1/14/2025

Reference Information

CVE: CVE-2024-12142

CWE: 200

ICSA: 25-035-06

Detections

Analytics