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Siemens SINEMA Remote Connect Server

Monitor4.3ICS-CERT ICSA-24-256-01Sep 10, 2024
Attack VectorNetwork
Auth RequiredLow
ComplexityLow
User InteractionNone needed
Summary

SINEMA Remote Connect Server versions prior to V3.2 SP2 contain a cache validation vulnerability (CWE-384) that allows an authenticated attacker to modify data or configuration. The vulnerability affects the integrity of remote access sessions to industrial devices. Siemens recommends updating to version 3.2 SP2 or later.

What this means
What could happen
An authenticated attacker could modify data or configuration in transit on the SINEMA Remote Connect Server, potentially affecting the integrity of remote access sessions and connected industrial devices.
Who's at risk
Organizations using Siemens SINEMA Remote Connect Server for remote management of industrial devices and PLCs should prioritize this update. This affects utilities and facilities using Siemens remote access infrastructure for distributed control system management.
How it could be exploited
An attacker with valid credentials to the SINEMA Remote Connect Server could send crafted requests over the network to manipulate session data or configuration settings, exploiting a cache validation weakness (CWE-384).
Prerequisites
  • Valid user credentials for SINEMA Remote Connect Server
  • Network access to the server on its management port
  • Server version prior to V3.2 SP2
Requires valid authenticationRemotely exploitableLow complexity attackAffects data integrity of remote sessions
Exploitability
Low exploit probability (EPSS 0.2%)
Affected products (1)
ProductAffected VersionsFix Status
SINEMA Remote Connect Server<V3.2 SP23.2 SP2
Remediation & Mitigation
0/4
Do now
0/2
HARDENINGRestrict network access to the SINEMA Remote Connect Server using firewall rules; do not expose the server to the internet
HARDENINGUse VPN or other secure remote access methods when remote connectivity to SINEMA is required
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
Long-term hardening
0/1
HARDENINGSegment the SINEMA Remote Connect Server behind a firewall, isolated from business networks
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