OTPulse

ICSA-19-260-02 Siemens SINEMA Remote Connect Server

Plan PatchCVSS 8.1ICS-CERT ICSA-19-260-02Sep 10, 2019
Siemens
Attack path
Attack VectorNetwork
Auth RequiredNone
ComplexityHigh
User InteractionNone needed
Summary

SINEMA Remote Connect Server (versions before 2.0 SP1) contains multiple vulnerabilities in authentication, access control, CSRF protection, and encryption (CWE-307, CWE-284, CWE-352, CWE-311). These vulnerabilities allow unauthenticated or low-privilege attackers to bypass authentication, access sensitive information, or perform unauthorized actions via the web interface. The affected product is used to provide secure remote access from engineering workstations and remote operation centers to industrial control devices at distributed sites. No public exploit code is currently available, and exploitation requires high technical skill.

What this means
What could happen
An attacker who gains access to the SINEMA Remote Connect Server web interface could execute commands on the server or manipulate remote connections to industrial sites, potentially disrupting VPN access to critical control systems and allowing unauthorized access to plant networks.
Who's at risk
Water utilities and electric utilities that use Siemens SINEMA Remote Connect Server for VPN access to remote substations, water treatment plants, or pump stations should care about this vulnerability. Anyone managing remote access to PLCs, RTUs, and SCADA systems via SINEMA is at risk.
How it could be exploited
An attacker with network access to the SINEMA Remote Connect Server web interface could exploit authentication bypass, CSRF, or information disclosure vulnerabilities (CWE-307, CWE-284, CWE-352, CWE-311) to gain control of the server. The attacker could then manipulate remote connections used by operators to access PLCs and other control devices at distant facilities, or intercept credentials transmitted to those devices.
Prerequisites
  • Network access to the SINEMA Remote Connect Server web interface (port 443 or configured HTTPS port)
  • Server version prior to 2.0 SP1
  • No authentication required for some vulnerability paths
remotely exploitableauthentication bypass possibleaffects remote access infrastructureCVSS 8.1 (high)requires high skill to exploit
Exploitability
Unlikely to be exploited — EPSS score 0.5%
Affected products (1)
ProductAffected VersionsFix Status
SINEMA Remote Connect Server<V2.0 SP12.0 SP1+
Remediation & Mitigation
0/4
Do now
0/2
WORKAROUNDRestrict network access to the SINEMA Remote Connect Server web interface using firewall rules—only allow connections from authorized operator workstations and network ranges
WORKAROUNDInstruct operators not to click links from untrusted sources while logged into SINEMA Remote Connect (prevents CSRF attacks)
Schedule — requires maintenance window
0/1

Patching may require device reboot — plan for process interruption

HOTFIXUpgrade SINEMA Remote Connect Server to version 2.0 SP1 or later
Long-term hardening
0/1
HARDENINGPlace the SINEMA Remote Connect Server behind a firewall and isolate it from the business network; restrict internet-facing exposure
View full CISA ICS-CERT advisory
API: /api/v1/advisories/46556a0c-112b-48bf-a978-7b6dc5982f98

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ICSA-19-260-02 Siemens SINEMA Remote Connect Server | CVSS 8.1 - OTPulse