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Missing HTTP headers in SINEMA Remote Connect Server before V3.0 SP2

Monitor4.2SSA-911567Jun 14, 2022
Attack VectorNetwork
Auth RequiredNone
ComplexityHigh
User InteractionRequired
Summary

SINEMA Remote Connect Server is missing HTTP security headers on the web server. This could make the servers more prone to clickjacking, channel downgrade attacks, and other client-based attack vectors.

What this means
What could happen
An attacker could trick users into clicking malicious links on the SINEMA Remote Connect Server interface or force their browser to downgrade to less secure connections, potentially compromising credentials or session integrity for remote access to industrial networks.
Who's at risk
Organizations running SINEMA Remote Connect Server (versions before 3.0 SP2) should care about this vulnerability. SINEMA Remote Connect is typically used by system integrators, automation engineers, and IT/OT staff to securely manage access to industrial automation equipment and PLCs from remote locations. The vulnerability primarily affects users accessing the server through a web browser.
How it could be exploited
An attacker would craft a malicious webpage or use a man-in-the-middle position to perform a clickjacking attack (overlaying a transparent frame of the SINEMA server) or force a channel downgrade. This requires the target user to visit a compromised site and interact with the SINEMA server interface, but does not require direct access to the server itself.
Prerequisites
  • User must be tricked into visiting an attacker-controlled or compromised webpage
  • User must be authenticated or visiting the SINEMA Remote Connect Server web interface
  • Attacker must be able to perform network interception (for channel downgrade attacks) or control a webpage visited by the target user
remotely exploitableuser interaction requiredlow complexity attackaffects remote access management for industrial control systems
Exploitability
Low exploit probability (EPSS 0.2%)
Affected products (1)
ProductAffected VersionsFix Status
SINEMA Remote Connect Server< V3.0 SP23.0 SP2
Remediation & Mitigation
0/4
Do now
0/3
HARDENINGImplement a Web Application Firewall (WAF) or reverse proxy configured to add missing HTTP security headers (X-Frame-Options, X-Content-Type-Options, Strict-Transport-Security) to the SINEMA server responses
HARDENINGRestrict web access to the SINEMA Remote Connect Server to trusted networks only using firewall rules or network segmentation
WORKAROUNDEducate users not to click suspicious links while using the SINEMA Remote Connect Server interface, especially if directed from untrusted sources
Schedule — requires maintenance window
0/1

Patching may require device reboot — plan for process interruption

HOTFIXUpdate SINEMA Remote Connect Server to version 3.0 SP2 or later
View full Siemens ProductCERT advisory
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Missing HTTP headers in SINEMA Remote Connect Server before V3.0 SP2 | CVSS 4.2 - OTPulse