Advantech WebAccess Vulnerabilities

Low RiskICS-CERT ICSA-12-047-01ANov 19, 2012

Summary

Advantech WebAccess versions prior to 7.0 contain multiple critical vulnerabilities including cross-site scripting (CWE-79), SQL injection (CWE-89), cross-site request forgery (CWE-352), information disclosure (CWE-200), buffer overflows (CWE-119), broken authentication (CWE-287), and insecure access control (CWE-284). These vulnerabilities could allow remote attackers to execute arbitrary code, bypass authentication, access sensitive data, or disrupt application availability without requiring valid credentials or high technical complexity.

What this means

What could happen

Multiple critical vulnerabilities in Advantech WebAccess could allow an attacker to inject malicious code, bypass authentication, access sensitive data, or cause the application to crash, disrupting remote monitoring and control of industrial processes.

Who's at risk

Water utilities, municipalities, and industrial facilities using Advantech WebAccess for remote monitoring and SCADA data access. This affects engineering workstations and control room computers that rely on WebAccess for visibility into process operations, particularly those running older versions prior to 7.0.

How it could be exploited

An attacker could exploit cross-site scripting (XSS) vulnerabilities to inject malicious JavaScript into WebAccess pages, or use SQL injection to manipulate the backend database. Authentication bypass flaws could allow unauthorized access without valid credentials. Memory safety issues could enable arbitrary code execution on the server running WebAccess.

Prerequisites

Network access to WebAccess web interface (typically port 80/443)
For some exploits, ability to craft malicious input in web forms or URL parameters
For some exploits, knowledge of database structure

remotely exploitablelow complexityno authentication required (for some vulnerabilities)no patch availablemultiple vulnerability classes (XSS, SQL injection, memory safety)

Exploitability

Moderate exploit probability (EPSS 9.7%)

Affected products (1)

ProductAffected VersionsFix Status

WebAccess: <patch_V7.0<patch V7.0No fix (EOL)

Remediation & Mitigation

0/5

Do now

0/3

WORKAROUNDRestrict network access to WebAccess to authorized personnel only using firewall rules and network segmentation

WORKAROUNDDisable WebAccess if not actively in use; use alternative remote monitoring methods

WORKAROUNDImplement Web Application Firewall (WAF) rules to block SQL injection and XSS payloads

Schedule — requires maintenance window

0/1

Patching may require device reboot — plan for process interruption

HOTFIXUpgrade Advantech WebAccess to version 7.0 or later if available from vendor

Mitigations - no patch available

0/1

WebAccess: <patch_V7.0 has reached End of Life. The vendor will not release a patch. Apply the following compensating controls:

HARDENINGSeparate WebAccess onto a dedicated network segment with restricted access from operational networks

CVEs (18)

CVE-2012-0233 CVE-2012-0234 CVE-2012-0235 CVE-2012-0236 CVE-2012-0237 CVE-2012-0238 CVE-2012-0239 CVE-2012-0240 CVE-2011-4526 CVE-2011-4524 CVE-2011-4525 CVE-2011-4521 CVE-2011-4522 CVE-2011-4523 CVE-2012-0241 CVE-2012-0242 CVE-2012-0243 CVE-2012-0244

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