Schneider Electric Security Notification
Embedded TCP/IP Stacks Vulnerabilities (AMNESIA:33) in Modicon
TM5 modules
12 October 2021

Overview
Schneider Electric is aware of multiple embedded TCP/IP stacks vulnerabilities, known as“AMNESIA:33”. The Modicon TM5 modules are affected by two of these vulnerabilities. The
complete details of the AMNESIA:33 vulnerabilities can be found in the Forescout report.
Modicon TM5 are I/O configuration modules for automation solutions based on Modicon andPacDrive 3 controllers.
Failure to apply the remediations provided below may risk network attacks which could result inDenial of Service or arbitrary code execution on the modules.

Affected Products and Versions
ProductVersion

TM5CSLC100FS: safety logic controller

Firmware V2.56 and prior

TM5CSLC200FS: safety logic controller

Firmware V2.56 and prior

TM5NS31: sercos III communication module

Firmware V2.78 and prior

TM5NEIP1: EtherNet/IP module

Firmware V3.10 and prior

TM5NEIP1K: EtherNet/IP FieldBus KIT

Firmware V3.10 and priorVulnerability Details
CVE ID: CVE-2020-13987
CVSS v3.1 Base Score 7.5 | High | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Original description: An Out-of-Bounds Read vulnerability exists in the uIP TCP/IP Stackcomponent when calculating the checksums for IP packets in upper_layer_cheksum in
net/ipv4/uip.c.
CVE ID: CVE-2020-17438
CVSS v3.1 Base Score 9.8 | Critical | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Original description: An issue was discovered in uIP 1.0, as used in Contiki 3.0 and otherproducts. The code that reassembles fragmented packets fails to properly validate the total
length of an incoming packet specified in its IP header, as well as the fragmentation offset value

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Schneider Electric Security Notification
specified in the IP header. By crafting a packet with specific values of the IP header length andthe fragmentation offset, attackers can write into the .bss section of the program (past thestatically allocated buffer that is used for storing the fragmented data) and cause a denial ofservice in uip_reass() in uip.c, or possibly execute arbitrary code on some target architectures.

Remediation
The Modicon TM5 modules below have a fix for these vulnerabilities.
Affected Product & Version

Remediation

TM5CSLC100FS
Firmware V2.56 and prior

1. On the engineering workstation, update toEcoStruxure Machine Expert v2.0.1 or above:
https://www.se.com/ww/en/product-rangedownload/2226-ecostruxure-machine-expert%28somachine%29/?selected-nodeid=14435955187#/software-firmware-tab
2. Use device assistant tool provided with EcoStruxure
Machine Expert and upgrade TM5CSLC100FS
firmware version v2.57. A reboot of the module isneeded.

TM5CSLC200FS
Firmware V2.56 and prior

1. On the engineering workstation, update to
EcoStruxure Machine Expert v2.0.1 or above:
https://www.se.com/ww/en/product-rangedownload/2226-ecostruxure-machine-expert%28somachine%29/?selected-nodeid=14435955187#/software-firmware-tab
2. Use device assistant tool provided with EcoStruxure
Machine Expert and upgrade TM5CSLC200FS
firmware version v2.57. A reboot of the module isneeded.

TM5NS31
Firmware V2.78 and prior

1. On the engineering workstation, update to
EcoStruxure Machine Expert v2.0.1 or above:
https://www.se.com/ww/en/product-rangedownload/2226-ecostruxure-machine-expert%28somachine%29/?selected-nodeid=14435955187#/software-firmware-tab
2. Use device assistant tool provided with EcoStruxure
Machine Expert and upgrade TM5NS31 firmware
version v2.79. A reboot of the module is needed.

TM5NEIP1
Firmware V3.10 and prior

Please contact your local Schneider Electric technicalsupport for more information on how to upgrade firmware toversion v3.12

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Schneider Electric Security Notification
TM5NEIP1K
Firmware V3.10 and prior

Please contact your local Schneider Electric technicalsupport for more information on how to upgrade firmware toversion v3.12

Customers should use appropriate patching methodologies when applying these patches totheir systems. We strongly recommend the use of back-ups and evaluating the impact of thesepatches 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 customers choose not to apply the remediation provided above, they should immediately
apply the following mitigations to reduce the risk of exploit:
Restrict network access to the controller connected to the TM5 module via network
segmentation and network access controls
To ensure you are informed of all updates, including details on affected products andremediation plans, subscribe to Schneider Electric’s security notification service here:
https://www.se.com/en/work/support/cybersecurity/security-notifications.jsp

General Security Recommendations
We strongly recommend the following industry cybersecurity best practices.
••••••••

Locate control and safety system networks and remote devices behind firewalls andisolate 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 forthat 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 theintended network to connect to the safety or control networks without proper sanitation.
Minimize network exposure for all control system devices and systems and ensure thatthey 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 themost current version available. Also, understand that VPNs are only as secure as theconnected devices.

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

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For More Information
This document provides an overview of the identified vulnerability or vulnerabilities and actions
required to mitigate. For more details and assistance on how to protect your installation, contact
your local Schneider Electric representative or Schneider Electric Industrial Cybersecurity
Services: https://www.se.com/ww/en/work/solutions/cybersecurity/. These organizations will befully aware of this situation and can support you through the process.
For further information related to cybersecurity in Schneider Electric’s products, visit thecompany’s cybersecurity support portal page:https://www.se.com/ww/en/work/support/cybersecurity/overview.jsp
LEGAL DISCLAIMER
THIS NOTIFICATION DOCUMENT, THE INFORMATION CONTAINED HEREIN, AND ANY MATERIALSLINKED FROM IT (COLLECTIVELY, THIS “NOTIFICATION”) ARE INTENDED TO HELP PROVIDE AN
OVERVIEW OF THE IDENTIFIED SITUATION AND SUGGESTED MITIGATION ACTIONS,REMEDIATION, FIX, AND/OR GENERAL SECURITY RECOMMENDATIONS AND IS PROVIDED ON AN“AS-IS” BASIS WITHOUT WARRANTY OR GUARANTEE OF ANY KIND. SCHNEIDER ELECTRICDISCLAIMS ALL WARRANTIES RELATING TO THIS NOTIFICATION, EITHER EXPRESS OR IMPLIED,INCLUDING WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
SCHNEIDER ELECTRIC MAKES NO WARRANTY THAT THE NOTIFICATION WILL RESOLVE THEIDENTIFIED SITUATION. IN NO EVENT SHALL SCHNEIDER ELECTRIC BE LIABLE FOR ANYDAMAGES OR LOSSES WHATSOEVER IN CONNECTION WITH THIS NOTIFICATION, INCLUDINGDIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIALDAMAGES, EVEN IF SCHNEIDER ELECTRIC HAS BEEN ADVISED OF THE POSSIBILITY OF SUCHDAMAGES. YOUR USE OF THIS NOTIFICATION IS AT YOUR OWN RISK, AND YOU ARE SOLELYLIABLE FOR ANY DAMAGES TO YOUR SYSTEMS OR ASSETS OR OTHER LOSSES THAT MAY
RESULT FROM YOUR USE OF THIS NOTIFICATION. SCHNEIDER ELECTRIC RESERVES THE RIGHTTO UPDATE OR CHANGE THIS NOTIFICATION AT ANY TIME AND IN ITS SOLE DISCRETION
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Revision Control
Version 1.0
12 October 2021

Original Releasesigned by Product Security Office
Product Security Office DigitallyDate: 2021.10.08 23:22:08 -04'00'
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