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Siemens SIMATIC HMI Basic, SINUMERIK, and Ruggedcom APE GHOST Vulnerability (Update A)

Act NowICS-CERT ICSA-15-064-01ADec 6, 2015
Summary

Siemens SIMATIC HMI Basic Panels 2nd Generation and SINUMERIK CNC controllers (808D, 828D, 840D sl) are affected by an input validation vulnerability (CWE-20). The vulnerability allows improper handling of crafted network packets or commands. SINUMERIK versions through 4.7 and all versions of SIMATIC HMI Basic Panels 2nd Generation are vulnerable. No patch is available for any affected product.

What this means
What could happen
An attacker could send specially crafted network packets to SINUMERIK CNC controllers or SIMATIC HMI panels, potentially causing the devices to malfunction, stop responding, or execute unintended commands. This could halt machining operations or disrupt operator visibility and control of production equipment.
Who's at risk
Manufacturing plants that operate Siemens SINUMERIK CNC machine tools (lathes, mills, machining centers) and facilities using SIMATIC HMI Basic Panels 2nd Generation for operator interfaces. Anyone responsible for automated production environments using these Siemens controllers should treat this as a concern.
How it could be exploited
An attacker with network access to the manufacturing network could send malformed or unexpected input packets to the SINUMERIK controller or HMI panel. The devices do not properly validate these inputs and could crash, become unresponsive, or in some cases execute unintended actions on the controlled machinery.
Prerequisites
  • Network access to SINUMERIK 808D, 828D, or 840D sl controller (TCP/UDP ports used for machine communication)
  • Network access to SIMATIC HMI Basic Panels 2nd Generation (Ethernet connection)
  • No authentication required to send specially crafted packets
remotely exploitableno authentication requiredlow complexityhigh EPSS score (86.7%)no patch availableaffects production machinery control
Exploitability
High exploit probability (EPSS 86.7%)
Affected products (4)
4 EOL
ProductAffected VersionsFix Status
SINUMERIK 808D: <=4.7≤ 4.7No fix (EOL)
SINUMERIK 828D: <=4.7≤ 4.7No fix (EOL)
SINUMERIK 840D sl: <=4.7≤ 4.7No fix (EOL)
SIMATIC HMI Basic Panels 2nd Generation: vers:all/*All versionsNo fix (EOL)
Remediation & Mitigation
0/5
Do now
0/1
WORKAROUNDApply firewall rules to restrict network access to SINUMERIK and HMI devices to only authorized engineering workstations and operator terminals
Mitigations - no patch available
0/4
The following products have reached End of Life with no planned fix: SINUMERIK 808D: <=4.7, SINUMERIK 828D: <=4.7, SINUMERIK 840D sl: <=4.7, SIMATIC HMI Basic Panels 2nd Generation: vers:all/*. Apply the following compensating controls:
HARDENINGImplement network segmentation to isolate SINUMERIK CNC controllers and SIMATIC HMI panels from general IT networks using firewalls or industrial network switches
HARDENINGMonitor network traffic to and from SINUMERIK and SIMATIC devices for unusual patterns or malformed packets; log and alert on suspicious activity
HARDENINGDisable unused network services and ports on SINUMERIK and HMI devices if they support such configuration
HARDENINGMaintain regular backups of CNC program files and machine configurations to enable rapid recovery if operations are disrupted
View full CISA ICS-CERT advisory
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Siemens SIMATIC HMI Basic, SINUMERIK, and Ruggedcom APE GHOST Vulnerability (Update A) - OTPulse