Advantech WebAccess Cross-Site Scripting
Low RiskICS-CERT ICSA-13-225-01May 16, 2013
Summary
Advantech WebAccess versions 7.0 and earlier are vulnerable to Cross-Site Scripting (CWE-79) attacks. An attacker can inject malicious JavaScript code into the web interface that executes in the browsers of operators and engineers who access the system. This could allow unauthorized access to plant control functions or theft of session credentials used to interact with SCADA/HMI systems.
What this means
What could happen
An attacker could inject malicious scripts into the WebAccess web interface that execute in the browsers of plant operators or engineers, potentially allowing theft of credentials or unauthorized modification of process parameters through the operator's session.
Who's at risk
Organizations operating Advantech WebAccess for remote plant monitoring and control should be concerned. This includes water utilities using WebAccess for SCADA/HMI dashboards, electric utilities for power system visualization, and industrial manufacturers relying on WebAccess for multi-site supervisory control. Engineering workstations and operator terminals are the entry points.
How it could be exploited
An attacker with network access to the WebAccess web interface could craft a malicious URL or form input containing JavaScript code. When an operator or engineer visits the compromised page or clicks the malicious link, the script executes in their browser with their session privileges, allowing the attacker to steal credentials or manipulate process settings.
Prerequisites
- Network access to WebAccess web interface (typically HTTP/HTTPS port 80 or 443)
- A user (operator or engineer) must visit the attacker-controlled URL or interact with injected content while logged in
remotely exploitableno authentication required for injectionlow complexityno patch availableaffects web-based control interface
Exploitability
Low exploit probability (EPSS 0.5%)
Affected products (1)
ProductAffected VersionsFix Status
WebAccess: <=7.0≤ 7.0No fix (EOL)
Remediation & Mitigation
0/7
Do now
0/2HARDENINGImplement network segmentation and firewall rules to restrict access to the WebAccess web interface to authorized engineering networks only
WORKAROUNDDisable or isolate the WebAccess web interface if not actively required for operations
Schedule — requires maintenance window
0/3Patching may require device reboot — plan for process interruption
HARDENINGEnforce the use of a Web Application Firewall (WAF) configured to block or sanitize suspicious script patterns and input
HARDENINGImplement Content Security Policy (CSP) headers to restrict script execution on the WebAccess domain
HARDENINGRequire operators and engineers to use separate credentials for WebAccess access and rotate passwords regularly
Long-term hardening
0/1HOTFIXMigrate to a patched or newer version of Advantech WebAccess if available from the vendor
Mitigations - no patch available
0/1WebAccess: <=7.0 has reached End of Life. The vendor will not release a patch. Apply the following compensating controls:
HARDENINGMonitor WebAccess access logs for suspicious URLs or encoded script patterns
CVEs (1)
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