Siemens SINUMERIK Integrate Operate Client
Plan Patch7.4ICS-CERT ICSA-21-194-04Jul 13, 2021
Attack VectorNetwork
Auth RequiredNone
ComplexityHigh
User InteractionNone needed
Summary
A vulnerability in SINUMERIK Integrate Client and included clients in certain SINUMERIK Operate versions allows an attacker to spoof SSL server certificates. Due to improper certificate validation (CWE-295), a man-in-the-middle attacker could forge credentials, intercept encrypted client-server communications, and potentially modify CNC machine configurations, programs, or control parameters without detection. The vulnerability affects Integrate Client versions 02, 03, and 04 (specific build ranges), Operate v4.8 (before SP8), v4.93 (before HF7), and v4.94 (before HF5). Multiple other SINUMERIK products (Manage, Analyze, Optimize) bundle Integrate Client and inherit this vulnerability; Siemens has not provided fixes for these products as of the advisory date.
What this means
What could happen
An attacker could intercept encrypted communications between SINUMERIK clients and servers by spoofing SSL certificates, potentially eavesdropping on or modifying CNC machine configuration and program data. This could compromise the integrity of machine control commands and manufacturing parameters.
Who's at risk
Manufacturing organizations operating Siemens SINUMERIK CNC machine control systems are affected. This includes the Operate, Manage, Analyze, Integrate, and Optimize families of SINUMERIK software used to program, monitor, and remotely manage CNC machines and production lines. Any organization using SINUMERIK Integrate Client or bundled clients in Operate versions v4.8, v4.93, or v4.94 (before the patched versions) should prioritize assessment.
How it could be exploited
An attacker positioned on the network between a SINUMERIK Integrate or Operate client and its server could present a forged SSL certificate. The vulnerable client would accept the invalid certificate and establish a connection, allowing the attacker to intercept, decrypt, and modify traffic containing machine configurations, programs, or control commands.
Prerequisites
- Network access to communication path between SINUMERIK client and server (man-in-the-middle position)
- SINUMERIK client version affected by the SSL certificate validation flaw
- Client must initiate connection to a server (passive listening attack)
No authentication required for exploitationLow attack complexityAffects multiple product familiesSSL/TLS certificate validation flawMan-in-the-middle attack vectorNo fix available for many SINUMERIK Manage, Analyze, and Optimize products
Exploitability
Low exploit probability (EPSS 0.1%)
Affected products (20)
3 with fix17 pending
ProductAffected VersionsFix Status
SINUMERIK Manage MyMachinesAll versionsNo fix yet
SINUMERIK Manage MyMachines /RemoteAll versionsNo fix yet
SINUMERIK Manage MyMachines /Spindel MonitorAll versionsNo fix yet
SINUMERIK Manage MyProgramsAll versionsNo fix yet
SINUMERIK Manage MyResources /ProgramsAll versionsNo fix yet
Remediation & Mitigation
0/8
Schedule — requires maintenance window
0/6Patching may require device reboot — plan for process interruption
SINUMERIK Integrate Client 02
HOTFIXUpdate SINUMERIK Integrate Client 02 to version 02.00.18
SINUMERIK Integrate Client 03
HOTFIXUpdate SINUMERIK Integrate Client 03 to version 03.00.18
SINUMERIK Integrate Client 04
HOTFIXUpdate SINUMERIK Integrate Client 04 to version 04.00.18
All products
HOTFIXUpdate SINUMERIK Operate to v4.8 SP8 (or update included SINUMERIK Integrate Client)
HOTFIXUpdate SINUMERIK Operate to v4.93 HF7 (or update included SINUMERIK Integrate Client)
HOTFIXUpdate SINUMERIK Operate to v4.94 HF5 (or update included SINUMERIK Integrate Client)
Long-term hardening
0/2HARDENINGIsolate SINUMERIK management and operate client workstations from untrusted networks; restrict network access to CNC control servers to authorized engineering workstations only
HARDENINGDeploy network segmentation to separate manufacturing control network from corporate business network; block unnecessary network paths between client and server
CVEs (1)
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API:
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