Multiple Vulnerabilities in User Management Component (UMC) Before V2.11.2
Plan Patch7.5SSA-999588Dec 12, 2023
Attack VectorNetwork
Auth RequiredNone
ComplexityLow
User InteractionNone needed
Summary
Siemens User Management Component (UMC) before V2.11.2 contains multiple vulnerabilities (CWE-942, CWE-79, CWE-120, CWE-20) affecting user management functionality in Siemens engineering and automation products. The most severe vulnerability could lead to a restart of the UMC server, resulting in denial of service. Affected components include TIA Portal, SINEC NMS, SIMATIC PCS neo, Opcenter Execution Foundation, and Opcenter Quality across multiple versions.
What this means
What could happen
An attacker could trigger a denial of service by restarting the User Management Component server, disrupting access to engineering workstations and potentially interrupting configuration or monitoring activities for automation systems. For products without available fixes, the UMC remains vulnerable to denial of service attacks.
Who's at risk
Engineering teams using Siemens TIA Portal (V14, V15.1, V16, V17, V18), automation engineers using SIMATIC PCS neo, quality system operators using Opcenter Quality, plant automation teams using Opcenter Execution Foundation, and network management staff using SINEC NMS. This affects any organization running these engineering environments with embedded User Management Component functionality.
How it could be exploited
An attacker with network access to the UMC server could exploit one of the input validation or processing flaws (CWE-20, CWE-120, CWE-79, CWE-942) to craft a malicious request that triggers an unhandled condition in the UMC, causing the service to restart and become unavailable.
Prerequisites
- Network access to the UMC server on its service port
- No authentication required (CVSS vector shows PR:N)
remotely exploitableno authentication requiredlow complexityaffects engineering workstations and automation systemsmultiple Siemens products affectedsome products have no patch available
Exploitability
Low exploit probability (EPSS 0.2%)
Affected products (9)
6 with fix3 pending
ProductAffected VersionsFix Status
Opcenter Execution Foundation< V24072407
Opcenter Quality< V23122312
SIMATIC PCS neo< V4.14.1
SINEC NMSAll versions < V2.0 SP12.0 SP1
Totally Integrated Automation Portal (TIA Portal) V14All versionsNo fix yet
Totally Integrated Automation Portal (TIA Portal) V15.1All versionsNo fix yet
Totally Integrated Automation Portal (TIA Portal) V16All versionsNo fix yet
Totally Integrated Automation Portal (TIA Portal) V17All versions < V17 Update 817 Update 8
Remediation & Mitigation
0/8
Do now
0/1Totally Integrated Automation Portal (TIA Portal) V14
WORKAROUNDFor TIA Portal V14, V15.1, and V16 where no fix is available, implement network-level access controls to restrict connections to the UMC server to trusted engineering workstations only
Schedule — requires maintenance window
0/6Patching may require device reboot — plan for process interruption
Opcenter Execution Foundation
HOTFIXUpdate Opcenter Execution Foundation to version 2407 or later
Opcenter Quality
HOTFIXUpdate Opcenter Quality to version 2312 or later
SIMATIC PCS neo
HOTFIXUpdate SIMATIC PCS neo to version 4.1 or later
SINEC NMS
HOTFIXUpdate SINEC NMS to version 2.0 SP1 or later
Totally Integrated Automation Portal (TIA Portal) V14
HOTFIXUpdate TIA Portal V17 to Update 8 or later
HOTFIXUpdate TIA Portal V18 to Update 3 or later
Long-term hardening
0/1HARDENINGSegment User Management Component servers from general IT network traffic and limit inbound access to known engineering workstations
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