Siemens SINEMA Server & SINEC NMS
Plan Patch8.8ICS-CERT ICSA-21-040-03Feb 9, 2021
Attack VectorNetwork
Auth RequiredLow
ComplexityLow
User InteractionNone needed
Summary
A path traversal vulnerability (CWE-22) in SINEMA Server (all versions before 14.0 SP2 Update 2) and SINEC NMS (all versions before 1.0 SP1 Update 1) allows an authenticated user to read, write, or delete arbitrary files on the affected system. An attacker with valid web interface credentials could exploit this to access sensitive configuration files, modify system behavior, or disrupt network management functions. Siemens has released security advisory SSA-156833 with detailed information. No public exploits are currently known.
What this means
What could happen
An authenticated attacker could read, write, or delete files on the SINEMA Server or SINEC NMS system, potentially compromising network management functions and configuration integrity for your Siemens industrial network.
Who's at risk
Water utilities, electric utilities, and other critical infrastructure operators using Siemens SINEMA Server or SINEC NMS for network management and monitoring. This impacts personnel who manage industrial control system networks and rely on these management platforms for device configuration and visibility.
How it could be exploited
An attacker with valid credentials to the web interface can exploit a path traversal vulnerability (CWE-22) to access files outside intended directories. The attacker sends crafted requests to read sensitive files, modify configurations, or delete critical data that the management server relies on.
Prerequisites
- Valid login credentials for SINEMA Server or SINEC NMS web interface
- Network access to the management server (port 443 or configured web service port)
- Knowledge of the path traversal payload format
Remotely exploitable via web interfaceRequires valid credentialsLow complexity attackAffects network management and configuration integrityPath traversal allows unauthorized file access
Exploitability
Moderate exploit probability (EPSS 1.9%)
Affected products (2)
2 with fix
ProductAffected VersionsFix Status
SINEC NMS: All<V1.0 SP1 Update 11.0 SP1 Update 1
SINEMA Server: All<V14.0 SP2 Update 214.0 SP2 Update 2
Remediation & Mitigation
0/5
Do now
0/1WORKAROUNDRestrict administrative and web interface access to SINEMA Server and SINEC NMS to trusted engineering and operations personnel only
Schedule — requires maintenance window
0/2Patching may require device reboot — plan for process interruption
HOTFIXUpdate SINEC NMS to version 1.0 SP1 Update 1 or later
HOTFIXUpdate SINEMA Server to version 14.0 SP2 Update 2 or later
Long-term hardening
0/2HARDENINGImplement firewall rules to limit network access to management servers from trusted subnets; isolate them from the business network and prevent direct Internet exposure
HARDENINGIf remote access is required, use VPN with current security updates and strong authentication
CVEs (1)
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