Fuji Electric V-Server
Plan Patch7.3ICS-CERT ICSA-18-254-01Sep 11, 2018
Attack VectorNetwork
Auth RequiredNone
ComplexityLow
User InteractionNone needed
Summary
V-Server versions 4.0.3.0 and prior contain multiple memory corruption vulnerabilities (use-after-free, buffer overflow, integer underflow) that allow unauthenticated remote code execution. Successful exploitation could result in arbitrary command execution on the device, denial of service, or information exposure of facility monitoring data. The vulnerabilities are triggered through malformed network requests to V-Server's service port and do not require authentication or user interaction.
What this means
What could happen
An attacker who reaches V-Server could run arbitrary code on it, potentially stopping monitoring and data collection for critical equipment or extracting sensitive process information. This could blind operators to facility conditions or disrupt the visibility needed to detect other problems.
Who's at risk
Energy utilities and any facility using Fuji Electric V-Server 4.0.3.0 or earlier for centralized monitoring and data collection of industrial equipment. This includes electric generation plants, substations, and distribution control centers where V-Server provides real-time visibility into grid or process operations.
How it could be exploited
An attacker on the network sends a crafted request to V-Server on its service port. V-Server processes the malformed input, triggering a memory corruption bug (use-after-free, buffer overflow, or integer underflow). This allows the attacker to overwrite memory and execute arbitrary commands with V-Server's privilege level.
Prerequisites
- Network reachability to V-Server service port
- No authentication required
- V-Server version 4.0.3.0 or earlier
remotely exploitableno authentication requiredlow complexityhigh CVSS (7.3)affects monitoring and control visibility
Exploitability
Moderate exploit probability (EPSS 4.7%)
Affected products (1)
ProductAffected VersionsFix Status
V-Server: 4.0.3.0 and prior≤ 4.0.3.04.0.4.0
Remediation & Mitigation
0/4
Do now
0/3HARDENINGPlace V-Server behind a firewall and restrict network access to only authorized engineering workstations and monitoring systems
HARDENINGIsolate the V-Server and its connected control system network from the business network to prevent lateral movement
HARDENINGIf remote access to V-Server is required, use a VPN with current patches and require strong authentication
Schedule — requires maintenance window
0/1Patching may require device reboot — plan for process interruption
HOTFIXUpgrade V-Server to version 4.0.4.0 or later from the Fuji Electric support portal (login required)
CVEs (7)
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