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Siemens SINEMA Remote Connect Server

Plan Patch7.4ICS-CERT ICSA-21-257-19Sep 14, 2021
Attack VectorAdjacent
Auth RequiredNone
ComplexityLow
User InteractionNone needed
Summary

Multiple vulnerabilities in SINEMA Remote Connect Server (versions before 3.0 SP2) allow an unauthenticated remote attacker to retrieve or modify sensitive information and cause denial-of-service conditions affecting devices managed through this remote access platform. The vulnerabilities stem from improper access controls (CWE-284), information exposure (CWE-200), and uncontrolled resource consumption (CWE-799). Siemens has released version 3.0 SP2 as a fix. No known public exploits are currently circulating.

What this means
What could happen
An attacker could retrieve sensitive configuration or operational data from the SINEMA Remote Connect Server or manipulate it, and could trigger a denial-of-service condition affecting devices managed through this remote access platform.
Who's at risk
Water utilities and municipalities using Siemens SINEMA Remote Connect Server for remote management of industrial control devices, PLCs, and field equipment. Any organization relying on this platform for remote diagnostics, configuration, or monitoring of critical infrastructure.
How it could be exploited
An attacker on the network segment where SINEMA Remote Connect Server is accessible could send crafted requests to exploit information disclosure or access control weaknesses, potentially gaining visibility into device configurations or disrupting remote management capabilities.
Prerequisites
  • Network access to SINEMA Remote Connect Server
  • No authentication required (based on CWE-284 and CWE-200 indicating authorization bypass or improper access control)
  • Server must be running version prior to 3.0 SP2
remotely exploitableno authentication requiredlow complexityaffects remote management of ICS devicesinformation disclosure and denial-of-service capability
Exploitability
Low exploit probability (EPSS 0.1%)
Affected products (1)
ProductAffected VersionsFix Status
SINEMA Remote Connect Server<V3.0 SP23.0 SP2
Remediation & Mitigation
0/4
Do now
0/2
HARDENINGRestrict network access to SINEMA Remote Connect Server using firewall rules; isolate the server from the business network and Internet
HARDENINGIf remote access is required, implement a VPN or other secure tunnel and ensure it is kept current with security updates
Schedule — requires maintenance window
0/1

Patching may require device reboot — plan for process interruption

HOTFIXUpdate SINEMA Remote Connect Server to version 3.0 SP2 or later
Long-term hardening
0/1
HARDENINGReview and follow Siemens operational security guidelines for industrial environments
View full CISA ICS-CERT advisory
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Siemens SINEMA Remote Connect Server | CVSS 7.4 - OTPulse