Advantech WebAccess Buffer Overflow Vulnerability
Act NowICS-CERT ICSA-15-251-01AJun 11, 2015
Summary
Advantech WebAccess versions 8.0 and earlier are vulnerable to a buffer overflow (CWE-121). The vulnerability could allow remote code execution on the WebAccess server. No patch is available from the vendor, and the product is end-of-life.
What this means
What could happen
A buffer overflow in Advantech WebAccess could allow an attacker to execute arbitrary code on the server, potentially disrupting remote monitoring and control of industrial processes or allowing theft of sensitive plant data.
Who's at risk
Water utilities and electric utilities that use Advantech WebAccess for remote plant monitoring and control should care about this vulnerability. It affects WebAccess servers that provide the human-machine interface (HMI) for viewing sensor data and issuing commands to PLCs, RTUs, and other field equipment.
How it could be exploited
An attacker with network access to the WebAccess server could send a specially crafted input to trigger a buffer overflow in memory, overwriting code or data. This could lead to arbitrary code execution on the machine running WebAccess, which often acts as the central monitoring and control hub for connected field devices.
Prerequisites
- Network access to the WebAccess server (typically port 80 or 443)
- WebAccess version 8.0 or earlier
remotely exploitableno patch availablebuffer overflow vulnerabilityhigh EPSS score (22.3%)
Exploitability
High exploit probability (EPSS 22.3%)
Affected products (1)
ProductAffected VersionsFix Status
WebAccess: <=8.0≤ 8.0No fix (EOL)
Remediation & Mitigation
0/4
Do now
0/2HARDENINGIsolate WebAccess servers from untrusted networks using firewall rules; restrict network access to authorized engineering workstations only
HARDENINGImplement network segmentation to separate WebAccess from corporate networks and the internet
Schedule — requires maintenance window
0/1Patching may require device reboot — plan for process interruption
HARDENINGMonitor WebAccess server for unusual process execution and network connections that could indicate exploitation
Mitigations - no patch available
0/1WebAccess: <=8.0 has reached End of Life. The vendor will not release a patch. Apply the following compensating controls:
HARDENINGPlan migration to a newer Advantech platform or alternative SCADA/HMI solution that is actively maintained and receives security patches
CVEs (1)
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