Severity: HIGH
Description: Stack-based buffer overflow vulnerability in V-Server v4.0.15.0 and V-Server Lite v4.0.15.0 and earlier allows an attacker to execute arbitrary code by having user open a specially crafted VPR file.
CVSS Score: N/A
D
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1. Risk Assessment
The vulnerability CVE-2023-31239 is a stack-based buffer overflow in FUJI ELECTRIC CO., LTD. and Hakko Electronics Co., Ltd.’s V-Server and V-Server Lite software versions v4.0.15.0 and earlier. This allows an attacker to potentially execute arbitrary code by crafting a malicious VPR file. The EPSS score of 0.001020000 suggests a relatively low, but non-negligible risk. The CVSS v3.1 score is 7.8 (High) indicating significant potential impact, though user interaction is required. The business impact is potentially high; successful exploitation could lead to complete control of the affected system, impacting operations that rely on V-Server for data acquisition, control, or monitoring. The likelihood of exploitation is moderate, as it requires a user to open a specifically crafted file, but the ease of exploitation is relatively high once the file is opened. Confidentiality, integrity, and availability are all potentially impacted – an attacker could steal data, modify configurations, or cause a denial of service.
2. Potential Attack Scenarios
An attacker could leverage this vulnerability through a targeted phishing campaign. The attack scenario would unfold as follows: an attacker crafts a malicious VPR file, designed to overflow the stack buffer when opened by V-Server. They then embed this VPR file in an email, disguised as a legitimate project file or update. The email is sent to a user who regularly interacts with VPR files. When the user opens the malicious VPR file in V-Server, the stack buffer overflows, allowing the attacker to inject and execute arbitrary code. This code could then install a backdoor, steal sensitive data, or disrupt the system’s operations. The outcome is potentially full compromise of the V-Server system, allowing the attacker to move laterally within the network depending on the V-Server’s network access.
3. Mitigation Recommendations
The primary mitigation is to upgrade V-Server and V-Server Lite to a version later than v4.0.15.0. Fuji Electric provides updates and downloads on their website: https://monitouch.fujielectric.com/site/download-e/03tellus_inf/index.php. As an immediate action, users should be cautious when opening VPR files from untrusted sources. Implementing file extension filtering can help prevent users from inadvertently opening malicious VPR files. Security awareness training should emphasize the importance of verifying the source and content of VPR files before opening them. Consider implementing application whitelisting to restrict which applications can execute on the V-Server system. Regularly scan V-Server systems for vulnerabilities using a vulnerability scanner.
4. Executive Summary
CVE-2023-31239 represents a significant vulnerability in FUJI ELECTRIC’s V-Server and V-Server Lite software. A stack-based buffer overflow could allow an attacker to execute arbitrary code by exploiting a specially crafted VPR file. While user interaction is required, a successful attack could lead to complete compromise of the affected system, impacting data confidentiality, integrity, and system availability. We recommend upgrading to the latest version of V-Server (beyond v4.0.15.0) as quickly as possible. Users should be vigilant when opening VPR files, and security awareness training should reinforce safe file handling practices. Addressing this vulnerability is critical to protect our operations that rely on V-Server and minimize the risk of data breaches or system disruptions. The potential impact warrants a high priority for remediation.