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Siemens SINEMA Remote Connect Server

Plan Patch8.8ICS-CERT ICSA-24-193-09Jul 9, 2024
Attack VectorNetwork
Auth RequiredLow
ComplexityLow
User InteractionNone needed
Summary

SINEMA Remote Connect Server before V3.2 HF1 is affected by multiple vulnerabilities that could allow an authenticated attacker to execute commands or perform unauthorized actions on the server. The vulnerabilities are related to improper input validation (CWE-77).

What this means
What could happen
An authenticated attacker could execute arbitrary commands on the SINEMA Remote Connect Server, potentially compromising remote access to industrial control systems and disrupting secure connections between engineering workstations and field devices.
Who's at risk
Organizations operating Siemens SINEMA Remote Connect Server, including water utilities, electric utilities, and manufacturing facilities that use remote engineering access to Siemens PLCs, gateways, and control systems. This affects any facility using SINEMA for secure remote maintenance and engineering connections.
How it could be exploited
An attacker with valid login credentials (engineering user or administrator account) can send specially crafted input to the SINEMA server over the network, exploiting improper input validation to execute system commands or bypass security controls. This allows the attacker to compromise the server and potentially escalate access to connected ICS networks.
Prerequisites
  • Valid SINEMA Remote Connect Server user credentials (engineering workstation account or administrator account)
  • Network access to the SINEMA Remote Connect Server port
  • SINEMA Remote Connect Server version prior to V3.2 HF1
["Remotely exploitable", "Authentication required but likely to be available in typical deployments", "High CVSS score (8.8)", "Affects secure remote access infrastructure", "No public exploitation reported but marked as "expected" in EPSS"]
Exploitability
Moderate exploit probability (EPSS 2.0%)
Affected products (1)
ProductAffected VersionsFix Status
SINEMA Remote Connect Server<V3.2 HF13.2 HF1
Remediation & Mitigation
0/5
Do now
0/2
WORKAROUNDRestrict network access to SINEMA Remote Connect Server using firewall rules to allow only authorized engineering workstations and networks
HARDENINGEnsure SINEMA Remote Connect Server is not accessible from the internet and is located behind firewalls, isolated from business networks
Schedule — requires maintenance window
0/1

Patching may require device reboot — plan for process interruption

HOTFIXUpdate SINEMA Remote Connect Server to version 3.2 HF1 or later
Long-term hardening
0/2
HARDENINGUse VPN with multi-factor authentication for any required remote access to SINEMA; keep VPN systems patched to current versions
HARDENINGImplement network segmentation to isolate the SINEMA server and connected ICS networks from general IT infrastructure
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