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Siemens SINEMA Remote Connect Server Cross-site Scripting Vulnerability

Monitor4.7ICS-CERT ICSA-16-208-03Apr 29, 2016
Attack VectorNetwork
Auth RequiredNone
ComplexityLow
User InteractionRequired
Summary

Siemens SINEMA Remote Connect Server versions prior to 1.2 contain a cross-site scripting (XSS) vulnerability that allows attackers to inject malicious scripts into the web interface. When an engineer or administrator visits a malicious URL or affected page, the script executes in their browser context. The vulnerability requires user interaction and does not directly impact connected industrial devices, but could compromise the credentials or session of the person using the remote access tool. No patch is planned for versions before 1.2, and version 1.2 availability/status is not confirmed in the advisory.

What this means
What could happen
An attacker could inject malicious scripts into the SINEMA Remote Connect Server web interface that execute when an engineer or administrator accesses it, potentially allowing theft of session credentials or unauthorized actions on connected industrial equipment.
Who's at risk
Plant engineers and IT administrators who use Siemens SINEMA Remote Connect Server to remotely access and manage industrial automation systems (PLCs, drives, HMIs, SCADA) should be aware that the server itself does not receive patches for this vulnerability.
How it could be exploited
An attacker crafts a malicious URL or email containing embedded JavaScript code and sends it to an engineer or administrator who uses SINEMA Remote Connect Server. When the user clicks the link or visits the affected page, the script runs in their browser with their privileges, allowing credential theft or session hijacking.
Prerequisites
  • User interaction required: engineer or administrator must click malicious link or visit attacker-controlled page
  • Network access to the SINEMA Remote Connect Server web interface (port 443 typically)
  • No special credentials needed from the attacker
remotely exploitableno authentication required from attackerlow complexityuser interaction requiredno patch availableaffects administrative access to critical industrial systems
Exploitability
Low exploit probability (EPSS 0.2%)
Affected products (1)
ProductAffected VersionsFix Status
SINEMA Remote Connect Server: <1.2<1.2No fix (EOL)
Remediation & Mitigation
0/4
Do now
0/2
HARDENINGRestrict network access to the SINEMA Remote Connect Server web interface using a firewall or IP allowlist—only permit connections from trusted engineering workstations and offices
WORKAROUNDTrain engineering and administrative staff not to click links or visit external websites while logged into SINEMA Remote Connect Server
Mitigations - no patch available
0/2
SINEMA Remote Connect Server: <1.2 has reached End of Life. The vendor will not release a patch. Apply the following compensating controls:
HARDENINGConsider using a VPN or jump host for all remote connections to the SINEMA server to add a layer of isolation
HARDENINGMonitor web server logs for suspicious URLs or script payloads in browser requests to the SINEMA server
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