CVE-2019-3946 Explained : Impact and Mitigation

Fuji Electric V-Server before version 6.0.33.0 is susceptible to a denial of service vulnerability when a specially crafted UDP message is sent to port 8005. This flaw can be exploited by an unauthenticated attacker to crash vserver.exe due to an integer overflow in the UDP message handling logic.

Understanding CVE-2019-3946

This CVE entry describes a denial of service vulnerability in Fuji Electric V-Server.

What is CVE-2019-3946?

The vulnerability in Fuji Electric V-Server allows an attacker to trigger a denial of service attack by sending a malicious UDP message to port 8005. The flaw results from an integer overflow in the handling of UDP messages.

The Impact of CVE-2019-3946

The vulnerability enables an unauthenticated attacker to crash the vserver.exe process, leading to a denial of service condition without the need for authentication or network proximity.

Technical Details of CVE-2019-3946

Fuji Electric V-Server version 6.0.33.0 and earlier are affected by this vulnerability.

Vulnerability Description

The flaw arises from an integer overflow in the handling logic of UDP messages, allowing attackers to crash the vserver.exe process.

Affected Systems and Versions

Product: Fuji Electric V-Server
Vendor: n/a
Versions Affected: Prior to 6.0.33.0

Exploitation Mechanism

Attackers can exploit the vulnerability by sending a specially crafted UDP message to port 8005.

Mitigation and Prevention

To address CVE-2019-3946, follow these mitigation strategies:

Immediate Steps to Take

Apply the vendor-supplied patch or update to version 6.0.33.0 or later.
Implement network segmentation to restrict access to vulnerable services.

Long-Term Security Practices

Regularly monitor and update systems to prevent known vulnerabilities.
Conduct security assessments and penetration testing to identify and remediate weaknesses.

Patching and Updates

Ensure timely installation of security patches and updates to mitigate potential risks.