Siemens SINEMA Remote Connect Server
Monitor6.5ICS-CERT ICSA-25-072-02Mar 11, 2025
Attack VectorNetwork
Auth RequiredLow
ComplexityLow
User InteractionNone needed
Summary
SINEMA Remote Connect Server before V3.2 SP3 contains improper logging and resource management vulnerabilities (CWE-117, CWE-772). An authenticated user could modify server settings or user accounts, potentially enabling unauthorized remote access or persistence. Siemens has released version 3.2 SP3 to address these issues.
What this means
What could happen
An authenticated attacker could modify administrative settings or user accounts on the Remote Connect Server, potentially gaining persistent access to remote engineering workstations and the connected industrial networks they manage.
Who's at risk
Water utilities, electric utilities, and other industrial facilities that use Siemens SINEMA Remote Connect Server for centralized remote access management to engineering workstations and field devices. This includes any organization that remotely manages PLCs, RTUs, or other control systems through a centralized remote access point.
How it could be exploited
An attacker with valid credentials to the SINEMA Remote Connect Server web interface could exploit improper logging or resource management to escalate privileges, create backdoor accounts, or alter authentication controls. This would allow the attacker to maintain access to the server and potentially pivot to connected engineering networks or remote sites.
Prerequisites
- Valid credentials for SINEMA Remote Connect Server web interface (engineering account or administrative account)
- Network access to the Remote Connect Server web interface (typically port 443 HTTPS)
- Server running version before 3.2 SP3
Requires valid credentials to exploitNetwork-reachable over HTTPSAffects remote access infrastructure used by engineering staffLow exploit complexity once credentials obtainedMedium CVSS (6.5) - integrity impact only
Exploitability
Low exploit probability (EPSS 0.4%)
Affected products (1)
ProductAffected VersionsFix Status
SINEMA Remote Connect Server<V3.2 SP33.2 SP3
Remediation & Mitigation
0/4
Do now
0/1WORKAROUNDRestrict network access to the Remote Connect Server to authorized engineering workstations and management systems using firewall rules or network segmentation
Schedule — requires maintenance window
0/1Patching may require device reboot — plan for process interruption
HOTFIXUpdate SINEMA Remote Connect Server to version 3.2 SP3 or later
Long-term hardening
0/2HARDENINGImplement network segmentation to isolate the Remote Connect Server and connected engineering networks from business networks and the Internet
HARDENINGUse VPN for any required remote access to the Remote Connect Server; ensure VPN is current with the latest security updates
CVEs (2)
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