Fuji Electric V-Server
Plan Patch7.8ICS-CERT ICSA-19-311-02Nov 7, 2019
Attack VectorLocal
Auth RequiredNone
ComplexityLow
User InteractionRequired
Summary
Fuji Electric V-Server versions 4.0.6 and earlier contain heap-based buffer overflow vulnerabilities that could result in device crash or potentially arbitrary code execution. The vulnerability requires local access and user interaction but no credentials. Fuji Electric has released Version 4.0.7.0 to mitigate the issue.
What this means
What could happen
Heap buffer overflow vulnerabilities in V-Server could allow an attacker with local access to crash the server or execute arbitrary commands, potentially disrupting energy management and monitoring functions that depend on it.
Who's at risk
Energy sector operators who use Fuji Electric V-Server for supervisory monitoring and control should care about this vulnerability. V-Server is commonly deployed in utility control centers to aggregate data from substations and field equipment; compromise could affect grid visibility and control capabilities.
How it could be exploited
An attacker with local access to a system running V-Server could provide malformed input that triggers a heap buffer overflow, causing the process to crash or, potentially, allowing code execution if memory layout permits. This requires the attacker to be able to interact with the application on the affected machine.
Prerequisites
- Local access to a system running V-Server 4.0.6 or earlier
- Ability to send input to the vulnerable application
- No authentication required to trigger the vulnerability
Low complexity exploitationNo authentication requiredAffects energy sector infrastructureHeap buffer overflow can lead to denial of service or code execution
Exploitability
Moderate exploit probability (EPSS 1.5%)
Affected products (1)
ProductAffected VersionsFix Status
V-Server: 4.0.6 and prior≤ 4.0.64.0.7.0
Remediation & Mitigation
0/4
Do now
0/2HARDENINGIsolate V-Server systems from business networks and the Internet using firewall rules; restrict network access to only authorized management hosts
WORKAROUNDImplement application-level access controls to limit which users or systems can send input to V-Server
Schedule — requires maintenance window
0/2Patching may require device reboot — plan for process interruption
HOTFIXUpgrade Fuji Electric V-Server to version 4.0.7.0 or later
HARDENINGIf remote access to V-Server is necessary, enforce use of a VPN with current security patches and strong authentication
CVEs (1)
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