Siemens SINUMERIK Integrate and SINUMERIK Operate

MonitorCVSS 7.4ICS-CERT ICSA-17-061-03Mar 2, 2017

Siemens

Attack path

Attack VectorNetwork

Auth RequiredNone

ComplexityHigh

User InteractionNone needed

Summary

A certificate validation weakness (CWE-300) in Siemens SINUMERIK Integrate and SINUMERIK Operate allows remote exploitation. The vulnerability affects SINUMERIK Integrate Operate Client versions 3.0.4 through 3.0.6 and 2.0.3 through 2.0.6, and Operate releases 4.5 SP6 through 4.5 SP6 Hotfix 8 and 4.7 SP2 Hotfix 1 through 4.7 SP4. An unauthenticated attacker on the network can intercept communications between the client and machine control system by presenting a fraudulent certificate, potentially allowing unauthorized machine control or data manipulation. Siemens states no patch is planned for affected versions.

What this means

What could happen

An attacker could exploit certificate validation weaknesses to impersonate a legitimate Siemens server and intercept or modify communications with SINUMERIK machine control systems. This could allow unauthorized control of CNC machines or falsification of operational data.

Who's at risk

Manufacturing facilities operating Siemens SINUMERIK CNC machines should care, particularly those with Operate Client versions 3.0.4 through 3.0.6 or 2.0.3 through 2.0.6, or Operate releases 4.5 SP6 through 4.5 SP6 Hotfix 8 or 4.7 SP2 Hotfix 1 through 4.7 SP4. This includes machine tool operators, maintenance engineers, and remote monitoring systems accessing CNC machine control via Siemens Operate software.

How it could be exploited

An attacker with network access to the connection between a SINUMERIK Operate client and the machine control system could perform a man-in-the-middle attack. By exploiting improper certificate validation (CWE-300), the attacker could present a fraudulent certificate and intercept the connection, allowing them to read commands sent to the machine or inject malicious control signals.

Prerequisites

Network access between SINUMERIK client and machine control system (can be local network or remote if client exposed to internet)
Client or Operate software running with vulnerable versions installed
No mutual certificate pinning or strict certificate validation in use

remotely exploitableno authentication required for exploitlow complexity exploitationno patch available for affected versionsdefault configurations vulnerable

Exploitability

Unlikely to be exploited — EPSS score 0.2%

Affected products (5)

5 EOL

ProductAffected VersionsFix Status

SINUMERIK Integrate Operate Client: All3.0.4.00.032 (including) and 3.0.6 (excluding)No fix (EOL)

Affected SINUMERIK Integrate Operate clients are included in the following Operate releases: All4.5 | SP6 (including) and V4.5 SP6 Hotfix 8 (excluding)No fix (EOL)

SINUMERIK Integrate Access MyMachine/Ethernet with AMM Service Engineer Client (ActiveX): All versionsAll versionsNo fix (EOL)

SINUMERIK Integrate Operate Client: All2.0.3.00.016 (including) and 2.0.6 (excluding)No fix (EOL)

Affected SINUMERIK Integrate Operate clients are included in the following Operate releases: All4.7 | SP2 Hotfix 1 (including) and V4.7 SP4 (excluding)No fix (EOL)

Remediation & Mitigation

0/4

Do now

0/1

HARDENINGRestrict network access to SINUMERIK Operate clients; isolate CNC machine networks from general IT or internet-facing networks using firewalls or network segmentation

Schedule — requires maintenance window

0/1

Patching may require device reboot — plan for process interruption

HOTFIXContact local Siemens service organization to obtain available updates for affected Operate releases (v4.5 SP6 or v4.7 SP2 Hotfix 1 and later)

Mitigations - no patch available

0/2

The following products have reached End of Life with no planned fix: SINUMERIK Integrate Operate Client: All, Affected SINUMERIK Integrate Operate clients are included in the following Operate releases: All, SINUMERIK Integrate Access MyMachine/Ethernet with AMM Service Engineer Client (ActiveX): All versions, SINUMERIK Integrate Operate Client: All, Affected SINUMERIK Integrate Operate clients are included in the following Operate releases: All. Apply the following compensating controls:

HARDENINGConfigure environment according to Siemens operational guidelines: https://www.industry.siemens.com/topics/global/en/industrial-security/Documents/operational_guidelines_industrial_security_en.pdf

HARDENINGMonitor and log all connections between Operate clients and machine control systems to detect unauthorized or anomalous communication

CVEs (1)

CVE-2017-2685

View full CISA ICS-CERT advisory

↑↓ Navigate · Esc Close

API: /api/v1/advisories/1cb6948d-8414-4fb9-9705-b116aaae0f29

Get OT security insights every Tuesday

Advisory breakdowns, a weekly summary, and incident analyses for the people actually defending OT environments. Free, no account required.