Siemens SINUMERIK Edge
Plan Patch7.4ICS-CERT ICSA-21-350-09Dec 14, 2021
Attack VectorNetwork
Auth RequiredNone
ComplexityHigh
User InteractionNone needed
Summary
A certificate validation vulnerability in SINUMERIK Edge (CWE-295) allows an attacker to spoof a trusted server by intercepting the communication path between client and server. The issue affects SINUMERIK Edge versions prior to 3.2. The attack requires network access to the communication path and has high complexity.
What this means
What could happen
An attacker could intercept and impersonate trusted communication between SINUMERIK Edge controllers and client devices, potentially injecting malicious commands into the machine tool control path or disrupting CNC operations through man-in-the-middle attacks.
Who's at risk
Machine tool operators and manufacturers using SINUMERIK Edge CNC controllers should be concerned. This affects any facility using Siemens SINUMERIK Edge for numerically controlled machining operations where the edge controller communicates with client devices over a network.
How it could be exploited
An attacker positioned on the network between a SINUMERIK Edge client and the controller could intercept the communication channel and present a forged certificate. Without proper certificate validation, the client would trust the attacker's connection, allowing command injection or data manipulation. This requires the attacker to intercept network traffic and perform TLS/SSL spoofing.
Prerequisites
- Network access to the communication path between SINUMERIK Edge client and controller (man-in-the-middle position)
- Ability to intercept and forge TLS/SSL certificates
- SINUMERIK Edge version prior to 3.2 deployed
Remotely exploitableHigh attack complexity (reduces immediate risk)Certificate/TLS validation bypassPatch available from vendor
Exploitability
Low exploit probability (EPSS 0.1%)
Affected products (1)
ProductAffected VersionsFix Status
SINUMERIK Edge<V3.23.2
Remediation & Mitigation
0/4
Do now
0/1HARDENINGRestrict network access to SINUMERIK Edge devices using firewall rules to limit exposure to potential man-in-the-middle attacks
Schedule — requires maintenance window
0/1Patching may require device reboot — plan for process interruption
HOTFIXUpdate SINUMERIK Edge to version 3.2 or later using the device's internal update mechanism
Long-term hardening
0/2HARDENINGImplement network segmentation to isolate SINUMERIK Edge controllers and clients from untrusted networks
HARDENINGFollow Siemens operational guidelines for industrial security and configure the environment according to product manuals
CVEs (1)
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