CVE-2018-10589
📋 TL;DR
A path traversal vulnerability in Advantech WebAccess allows attackers to execute arbitrary code by manipulating file paths. This affects multiple WebAccess products including SCADA systems used in industrial control environments. Organizations using vulnerable versions are at risk of complete system compromise.
💻 Affected Systems
- Advantech WebAccess
- Advantech WebAccess Dashboard
- Advantech WebAccess Scada Node
- Advantech WebAccess/NMS
📦 What is this software?
Webaccess by Advantech
Webaccess by Advantech
Webaccess\/nms by Advantech
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise allowing remote code execution, potential ransomware deployment, manipulation of industrial processes, and data exfiltration.
Likely Case
Unauthorized access to sensitive files, privilege escalation, and installation of backdoors for persistent access.
If Mitigated
Limited impact with proper network segmentation, application whitelisting, and minimal privileges.
🎯 Exploit Status
Path traversal vulnerabilities are commonly exploited with simple HTTP requests.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: WebAccess 8.3.1 and later, Dashboard 2.0.16+, NMS 2.0.4+
Vendor Advisory: https://ics-cert.us-cert.gov/advisories/ICSA-18-135-01
Restart Required: Yes
Instructions:
1. Download latest version from Advantech support portal. 2. Backup configuration and data. 3. Install update following vendor documentation. 4. Restart services/systems. 5. Verify patch installation.
🔧 Temporary Workarounds
Network Segmentation
allIsolate WebAccess systems from untrusted networks and internet.
Application Whitelisting
windowsRestrict execution to authorized applications only.
🧯 If You Can't Patch
- Implement strict network access controls and firewall rules to limit exposure
- Deploy intrusion detection systems and monitor for suspicious file access patterns
🔍 How to Verify
Check if Vulnerable:
Check installed version against affected versions list. Review system logs for path traversal attempts.Check Version:
Check WebAccess About dialog or installation directory version files.Verify Fix Applied:
Confirm version is 8.3.1 or later for WebAccess, 2.0.16+ for Dashboard, 2.0.4+ for NMS.📡 Detection & Monitoring
Log Indicators:
- Unusual file path access patterns
- ../ or ..\ sequences in HTTP requests
- Unauthorized file read/write attempts
Network Indicators:
- HTTP requests with directory traversal sequences
- Unexpected outbound connections from WebAccess systems
SIEM Query:
source="webaccess" AND ("..\" OR "../" OR "%2e%2e" OR "%252e%252e")