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Advantech WebAccess Vulnerabilities

Act Now9.8ICS-CERT ICSA-16-014-01Oct 17, 2016
Attack VectorNetwork
Auth RequiredNone
ComplexityLow
User InteractionNone needed
Summary

Advantech WebAccess versions 8.0 and earlier contain multiple critical vulnerabilities including buffer overflows (CWE-121, CWE-122, CWE-119), SQL injection (CWE-89), cross-site scripting (CWE-79), path traversal (CWE-22), unrestricted file upload (CWE-434), missing authentication (CWE-284), and improper input validation (CWE-20). These vulnerabilities allow remote attackers to bypass authentication, execute arbitrary code, access sensitive data, and manipulate industrial device configurations without authentication or user interaction.

What this means
What could happen
An attacker could remotely gain administrative control of Advantech WebAccess and issue arbitrary commands to connected industrial devices, potentially disrupting or altering critical plant operations including SCADA systems, PLCs, and remote terminal units.
Who's at risk
Water utilities, electric utilities, and manufacturing plants using Advantech WebAccess for SCADA monitoring and control of PLCs, RTUs, and other industrial devices. This includes any operation relying on WebAccess for remote monitoring or automated alarming.
How it could be exploited
An attacker with network access to the WebAccess server could exploit multiple input validation and injection vulnerabilities to bypass authentication, upload malicious code, or execute arbitrary SQL commands. The low-complexity attack requires no user interaction and could allow the attacker to modify process parameters or shut down equipment.
Prerequisites
  • Network access to WebAccess application port (typically 80/443)
  • WebAccess version 8.0 or earlier deployed
  • No network segmentation isolating WebAccess from untrusted networks
remotely exploitableno authentication requiredlow complexityhigh EPSS score (72.2%)no patch availableaffects critical industrial control systemsmultiple critical input validation flaws
Exploitability
High exploit probability (EPSS 72.2%)
Affected products (1)
ProductAffected VersionsFix Status
WebAccess: <=8.0≤ 8.0No fix (EOL)
Remediation & Mitigation
0/5
Do now
0/3
HARDENINGIsolate WebAccess servers from the Internet and untrusted network segments using a firewall or demilitarized zone (DMZ); restrict inbound connections to authorized IP addresses and engineering workstations only
HARDENINGImplement network monitoring and intrusion detection rules to detect SQL injection and file upload attempts targeting WebAccess
WORKAROUNDDisable unnecessary WebAccess features and services that are not required for plant operations
Schedule — requires maintenance window
0/1

Patching may require device reboot — plan for process interruption

HARDENINGImplement strong access controls and multi-factor authentication for all WebAccess administrative accounts
Long-term hardening
0/1
HOTFIXEvaluate replacement or decommissioning of WebAccess 8.0 and earlier versions; contact Advantech for guidance on end-of-life products and upgrade paths to newer versions with security patches
View full CISA ICS-CERT advisory
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