OTPulse

Siemens SINEMA Remote Connect Server

MonitorCVSS 4.3ICS-CERT ICSA-24-256-01Sep 10, 2024
Siemens
Attack path
Attack VectorNetwork
Auth RequiredLow
ComplexityLow
User InteractionNone needed
Summary

SINEMA Remote Connect Server before V3.2 SP2 is affected by a session handling vulnerability (CWE-384) that could allow authenticated attackers to manipulate session data or bypass authorization controls. This could potentially enable unauthorized access to remote connections or escalation of privileges within the remote access infrastructure.

What this means
What could happen
An attacker with valid credentials could modify session data or manipulate the remote connection setup, potentially allowing unauthorized access to industrial control networks or disruption of remote monitoring and maintenance operations.
Who's at risk
Organizations using Siemens SINEMA Remote Connect Server for remote access to industrial systems—common in water utilities, electric utilities, and manufacturing facilities for remote maintenance and monitoring of PLCs, RTUs, and SCADA systems.
How it could be exploited
An attacker with valid login credentials accesses the SINEMA Remote Connect Server management interface. By exploiting a session handling weakness (CWE-384), the attacker could manipulate session tokens or bypass authorization checks to gain elevated privileges or access remote connections they should not have, potentially pivoting into connected OT networks.
Prerequisites
  • Valid user credentials for SINEMA Remote Connect Server
  • Network access to the SINEMA Remote Connect Server administrative interface (typically port 443)
  • Authentication required; vulnerability is not remotely exploitable without valid login
Remotely accessible via networkAuthentication required, reducing riskLow EPSS score (0.2%)Session handling vulnerability could enable privilege escalation
Exploitability
Unlikely to be exploited — EPSS score 0.2%
Affected products (1)
ProductAffected VersionsFix Status
SINEMA Remote Connect Server<V3.2 SP23.2 SP2
Remediation & Mitigation
0/3
Do now
0/2
WORKAROUNDRestrict network access to SINEMA Remote Connect Server to authorized users and networks only, using firewall rules to limit exposure
HARDENINGUse a VPN for all remote access to SINEMA Remote Connect Server instead of direct internet exposure
Schedule — requires maintenance window
0/1

Patching may require device reboot — plan for process interruption

HOTFIXUpdate SINEMA Remote Connect Server to version 3.2 SP2 or later
View full CISA ICS-CERT advisory
API: /api/v1/advisories/d9c1f730-0e30-478c-a695-1a182b38a048

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Siemens SINEMA Remote Connect Server | CVSS 4.3 - OTPulse