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Siemens WinCC WebNavigator Multiple Vulnerabilities

Low RiskICS-CERT ICSA-12-256-01Jun 16, 2012
Summary

Siemens WinCC WebNavigator component versions 7.0 SP3 and earlier contain multiple security vulnerabilities including SQL injection (CWE-89), cross-site scripting (CWE-79), cross-site request forgery (CWE-352), and improper input validation (CWE-425, CWE-618). These vulnerabilities allow an attacker with network access to the web interface to inject malicious commands, execute arbitrary code, or redirect operators to untrusted content. No patch is currently available from Siemens.

What this means
What could happen
An attacker could inject malicious commands or scripts into WinCC WebNavigator to manipulate industrial processes, view sensitive process data, or disrupt operator control of critical infrastructure equipment.
Who's at risk
Water utilities, electric power systems, and other critical infrastructure operators running Siemens WinCC versions 7.0 SP3 or earlier who rely on the WebNavigator component for remote process monitoring or engineering access. This affects any facility using WinCC SCADA systems with web-based operator interfaces.
How it could be exploited
An attacker with network access to the WinCC WebNavigator web interface could exploit command injection (CWE-89) or cross-site scripting (CWE-79) vulnerabilities to inject payloads. These could be delivered through web requests to manipulate process setpoints, steal credentials, or redirect operators to malicious content, bypassing normal authentication controls (CWE-352).
Prerequisites
  • Network access to the WinCC WebNavigator web interface (typically HTTP/HTTPS port)
  • WinCC version 7.0_SP3 or earlier
  • No special authentication required for some attack vectors (cross-site request forgery)
remotely exploitablelow complexityno patch availablecross-site scripting (XSS)SQL injectioncross-site request forgery (CSRF)
Exploitability
Low exploit probability (EPSS 0.6%)
Affected products (1)
ProductAffected VersionsFix Status
WebNavigator component of WinCC: <=7.0_SP3≤ 7.0 SP3No fix yet
Remediation & Mitigation
0/5
Do now
0/3
HARDENINGImplement network segmentation: isolate WinCC systems on a dedicated VLAN with firewall rules that restrict web access to authorized engineering workstations only
WORKAROUNDDisable or restrict access to WinCC WebNavigator if not actively in use for remote monitoring or engineering
WORKAROUNDDeploy a reverse proxy or web application firewall (WAF) in front of WebNavigator to filter for SQL injection and cross-site scripting payloads
Schedule — requires maintenance window
0/2

Patching may require device reboot — plan for process interruption

HARDENINGEnforce strong HTTP security headers (Content-Security-Policy, X-Frame-Options) to mitigate XSS and clickjacking
HOTFIXPlan upgrade to a newer WinCC version that includes patches for these vulnerabilities
View full CISA ICS-CERT advisory
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Siemens WinCC WebNavigator Multiple Vulnerabilities - OTPulse