Heap-based Buffer Overflow Vulnerability in User Management Component (UMC)
Act Now9.8SSA-928984Dec 16, 2024
Attack VectorNetwork
Auth RequiredNone
ComplexityLow
User InteractionNone needed
Summary
The User Management Component (UMC) in affected Siemens products contains a heap-based buffer overflow vulnerability that allows an unauthenticated remote attacker to execute arbitrary code. The vulnerability exists in the memory handling of the UMC when processing untrusted input, enabling code injection attacks without prior authentication or user interaction. Siemens has released patches for Opcenter Execution Foundation, Opcenter Intelligence, Opcenter Quality, Opcenter RDnL, SIMATIC PCS neo V4.1, and SIMATIC PCS neo V5.0. However, SIMATIC PCS neo V4.0, SINEC NMS, and all versions of TIA Portal (V16–V19) have no fixes available from the vendor.
What this means
What could happen
An unauthenticated attacker on your network could exploit this heap-based buffer overflow to run arbitrary code on affected Siemens systems, potentially taking control of manufacturing execution systems, process control platforms, or engineering workstations and altering production schedules, process parameters, or system configurations.
Who's at risk
Manufacturing execution system operators and plant engineers using Siemens Opcenter suite, SIMATIC PCS neo, SINEC Network Management System, or TIA Portal engineering workstations need to address this vulnerability. Organizations running production scheduling, batch management, MES-level operations, or engineering workstations are affected.
How it could be exploited
An attacker sends a specially crafted network request to the User Management Component on an affected system without needing credentials. The oversized input overflows a buffer in memory, allowing the attacker to inject and execute malicious code that runs with the privileges of the UMC service.
Prerequisites
- Network access to the affected Siemens product on port used by User Management Component (typically port 4801 or similar, depending on product)
- No authentication required
- Vulnerable version of UMC must be installed and running
remotely exploitableno authentication requiredlow complexity attackcritical CVSS score (9.8)heap-based buffer overflow allows arbitrary code executionseveral Siemens products have no fix available
Exploitability
Moderate exploit probability (EPSS 2.6%)
Affected products (12)
6 with fix4 pending2 EOL
ProductAffected VersionsFix Status
SIMATIC PCS neo V4.0All versionsNo fix (EOL)
Opcenter Execution Foundation< 2501.00012501.0001
Opcenter Intelligence< 2501.00012501.0001
Opcenter Quality< 25122512
Opcenter RDnL< 24102410
SIMATIC PCS neo V4.1All versions < V4.1 Update 34.1 Update 3
SIMATIC PCS neo V5.0All versions < V5.0 Update 15.0 Update 1
Totally Integrated Automation Portal (TIA Portal) V16All versionsNo fix yet
Remediation & Mitigation
0/8
Do now
0/1SIMATIC PCS neo V4.0
HARDENINGFor SIMATIC PCS neo V4.0, SINEC NMS, and TIA Portal (all versions), implement network segmentation to restrict access to the User Management Component to only authorized engineering workstations and restrict inbound traffic on UMC service ports
Schedule — requires maintenance window
0/6Patching may require device reboot — plan for process interruption
Opcenter Execution Foundation
HOTFIXUpdate Opcenter Execution Foundation to version 2501.0001 or later
Opcenter Intelligence
HOTFIXUpdate Opcenter Intelligence to version 2501.0001 or later
Opcenter Quality
HOTFIXUpdate Opcenter Quality to version 2512 or later
Opcenter RDnL
HOTFIXUpdate Opcenter RDnL to version 2410 or later
SIMATIC PCS neo V4.1
HOTFIXUpdate SIMATIC PCS neo V4.1 to Update 3 or later
SIMATIC PCS neo V5.0
HOTFIXUpdate SIMATIC PCS neo V5.0 to Update 1 or later
Long-term hardening
0/1WORKAROUNDFor products with no fix available, monitor Siemens SecurityAdvisories for future mitigation guidance and plan migration to patched versions when available
CVEs (1)
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