WellinTech KingView 6.53 KVWebSvr ActiveX
Act Now9.8ICS-CERT ICSA-11-074-01Dec 16, 2011
Attack VectorNetwork
Auth RequiredNone
ComplexityLow
User InteractionNone needed
Summary
WellinTech KingView version 6.53 contains a buffer overflow vulnerability in the KVWebSvr ActiveX control component. The vulnerability is caused by improper bounds checking, allowing an attacker to exceed allocated memory boundaries. The flaw permits remote, unauthenticated code execution with high severity (CVSS 9.8) when a user with KingView installed accesses a malicious web page or document containing a specially crafted ActiveX control. The affected product is end-of-life with no vendor patch available.
What this means
What could happen
An attacker with network access could execute arbitrary code on a KingView 6.53 engineering workstation or server through a malicious ActiveX control, potentially gaining full control over the system and any connected industrial processes.
Who's at risk
This vulnerability affects any organization using WellinTech KingView 6.53 as their HMI/SCADA engineering workstation or web server, particularly water utilities, electric utilities, and other industrial facilities that rely on KingView for real-time monitoring and control of critical processes.
How it could be exploited
An attacker crafts a malicious web page or document containing a specially crafted ActiveX control that exploits the buffer overflow vulnerability in KVWebSvr. When an engineer opens the page or document in a browser on a system running KingView 6.53, the ActiveX control is loaded and executed without user consent or awareness, allowing code execution in the security context of the logged-in user.
Prerequisites
- Network access to the engineering workstation or server running KingView 6.53
- Victim must browse to attacker-controlled web page or open malicious document in a browser with ActiveX support
- KingView 6.53 with vulnerable KVWebSvr component must be installed
remotely exploitableno authentication requiredlow complexityhigh EPSS score (33.2%)no patch availableaffects industrial control and monitoring systems
Exploitability
High exploit probability (EPSS 33.2%)
Affected products (1)
ProductAffected VersionsFix Status
WellinTech KingView: V6.53V6.53No fix (EOL)
Remediation & Mitigation
0/4
Do now
0/2WORKAROUNDImplement firewall rules to restrict web browsing on engineering workstations running KingView to only approved, trusted sites
HARDENINGDisable ActiveX in web browsers on all engineering workstations, or restrict it to trusted sites only
Schedule — requires maintenance window
0/1Patching may require device reboot — plan for process interruption
HOTFIXUpgrade to a newer version of KingView that is supported and patched, or migrate to an alternative HMI/SCADA platform with active vendor support
Mitigations - no patch available
0/1WellinTech KingView: V6.53 has reached End of Life. The vendor will not release a patch. Apply the following compensating controls:
HARDENINGIsolate KingView engineering workstations on a separate network segment with restricted internet access
CVEs (1)
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