CVE-2018-8845
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary code on affected Advantech WebAccess systems through a heap-based buffer overflow. It affects multiple WebAccess products and versions, primarily in industrial control systems. Successful exploitation could lead to 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
Complete system takeover with attacker gaining full control over the industrial control system, potentially enabling physical damage, production disruption, or data exfiltration.
Likely Case
Remote code execution allowing attackers to install malware, pivot to other systems, or disrupt industrial operations.
If Mitigated
Limited impact if systems are isolated, patched, or protected by network segmentation and intrusion prevention systems.
🎯 Exploit Status
The vulnerability is remotely exploitable without authentication and has public proof-of-concept code available, making exploitation relatively straightforward for attackers.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: WebAccess 8.3.1 or later, Dashboard 2.0.16 or later, NMS 2.0.4 or later
Vendor Advisory: https://ics-cert.us-cert.gov/advisories/ICSA-18-135-01
Restart Required: Yes
Instructions:
1. Download the latest version from Advantech's official website. 2. Backup current configuration and data. 3. Install the update following vendor instructions. 4. Restart the system. 5. Verify the update was successful.
🔧 Temporary Workarounds
Network Segmentation
allIsolate WebAccess systems from untrusted networks and the internet
Firewall Restrictions
allRestrict network access to WebAccess systems to only trusted IP addresses
🧯 If You Can't Patch
- Implement strict network segmentation to isolate vulnerable systems
- Deploy intrusion prevention systems with signatures for this CVE
🔍 How to Verify
Check if Vulnerable:
Check the installed version of Advantech WebAccess components against the affected version listCheck Version:
Check version through WebAccess interface or consult system documentationVerify Fix Applied:
Verify that WebAccess version is 8.3.1 or later, Dashboard is 2.0.16 or later, or NMS is 2.0.4 or later📡 Detection & Monitoring
Log Indicators:
- Unusual process creation, unexpected network connections from WebAccess processes
- Buffer overflow error messages in application logs
Network Indicators:
- Unusual traffic patterns to WebAccess ports
- Exploit attempts against WebAccess services
SIEM Query:
source="webaccess" AND (event_type="buffer_overflow" OR process_name="cmd.exe" OR process_name="powershell.exe")