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ICSA-18-345-02 Siemens SINUMERIK Controllers (Update A)

Act Now10ICS-CERT ICSA-18-345-02Dec 11, 2018
Attack VectorNetwork
Auth RequiredNone
ComplexityLow
User InteractionNone needed
Summary

Multiple buffer overflow and memory handling vulnerabilities in Siemens SINUMERIK controller firmware allow remote code execution without authentication. The vulnerabilities exist in the service daemon listening on default ports 4842/TCP and 5900/TCP. Exploitation could allow an attacker to gain full system control of the CNC controller. Affected versions: SINUMERIK 808D v4.7 and v4.8 (prior to v4.91), SINUMERIK 828D v4.7 (prior to v4.7 SP6 HF1), SINUMERIK 840D sl v4.7 (prior to v4.7 SP6 HF5), and SINUMERIK 840D sl v4.8 (prior to v4.8 SP3).

What this means
What could happen
An attacker with network access to a SINUMERIK controller could execute arbitrary code with full system privileges, potentially altering machine tool operations, disabling safety systems, or corrupting production programs. The CVSS score of 10 (critical) reflects the severity of unrestricted remote code execution on industrial machinery.
Who's at risk
Machine shops, job shops, manufacturing facilities, and OEMs operating Siemens SINUMERIK CNC controllers for machining centers and multi-axis lathes. This affects any site using SINUMERIK 808D, 828D, or 840D sl controllers for production operations where loss of control or malicious code execution could halt production or compromise part quality and safety.
How it could be exploited
An attacker on the network can send a specially crafted packet to the affected SINUMERIK controller on its default service ports (4842/TCP or 5900/TCP) without credentials. The vulnerability allows the attacker to bypass memory protections and execute arbitrary code directly on the controller, gaining full control of the machine tool.
Prerequisites
  • Network access to the SINUMERIK controller on ports 4842/TCP or 5900/TCP
  • No authentication required
  • Controller must be running an affected firmware version
remotely exploitableno authentication requiredlow complexityhigh CVSS score (10/10)high EPSS score (10.5%)affects safety systemsno patch available for some versionsdefault service ports exposed
Exploitability
High exploit probability (EPSS 10.5%)
Affected products (5)
5 with fix
ProductAffected VersionsFix Status
SINUMERIK 808D V4.7<V4.914.91
SINUMERIK 808D V4.8<V4.914.91
SINUMERIK 828D V4.7<V4.7 SP6 HF14.7 SP6 HF1
SINUMERIK 840D sl V4.7<V4.7 SP6 HF54.7 SP6 HF5
SINUMERIK 840D sl V4.8<V4.8 SP34.8 SP3
Remediation & Mitigation
0/8
Do now
0/2
WORKAROUNDBlock inbound traffic to ports 4842/TCP and 5900/TCP on the network interface (Port X130) at the firewall or network switch
HARDENINGRestrict administrative access to the controller to authorized engineering personnel only
Schedule — requires maintenance window
0/6

Patching may require device reboot — plan for process interruption

SINUMERIK 828D V4.7
HOTFIXUpdate SINUMERIK 828D v4.7 to version 4.7 SP6 HF1
SINUMERIK 840D sl V4.7
HOTFIXUpdate SINUMERIK 840D sl v4.7 to version 4.7 SP6 HF5
SINUMERIK 840D sl V4.8
HOTFIXUpdate SINUMERIK 840D sl v4.8 to version 4.8 SP3
All products
HOTFIXUpdate SINUMERIK 808D to firmware version 4.91 or later
HARDENINGSegment SINUMERIK controllers from the business network and place behind firewalls; isolate cells with restricted network access
HARDENINGImplement VPN encryption for any remote access to SINUMERIK controllers for maintenance or diagnostics
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ICSA-18-345-02 Siemens SINUMERIK Controllers (Update A) | CVSS 10 - OTPulse