Severity: Unknown
Description: Out-of-bounds write vulnerability exists in V-Server V4.0.18.0 and earlier and V-Server Lite V4.0.18.0 and earlier. If a user opens a specially crafted VPR file, information may be disclosed and/or arbitrary code may be executed.
CVSS Score: N/A
D
No data available.
No data available.
1. Risk Assessment
The vulnerability CVE-2023-47584 is an out-of-bounds write vulnerability in Fuji Electric’s V-Server and V-Server Lite software versions 4.0.18.0 and earlier. This means a specially crafted VPR file can cause the software to write data outside the allocated memory buffer, potentially leading to information disclosure and/or arbitrary code execution. The business impact can range from service disruption to complete system compromise, depending on the specific outcome of the exploit. Given the out-of-bounds write nature, exploitation is moderately likely, especially if users frequently exchange VPR files with potentially untrusted sources. The ease of exploitation is currently assessed as moderate, as it requires a specifically crafted VPR file, but a successful attack could have significant impact. Confidentiality could be compromised through information disclosure, integrity through data corruption, and availability through crashes or code execution that disrupts normal operation. The EPSS score of 0.000620000 suggests a relatively low, but not insignificant, probability of exploitation in the wild.
2. Potential Attack Scenarios
An attacker could craft a malicious VPR file and send it to a user who utilizes V-Server or V-Server Lite to open it. The user, believing the file is legitimate, opens it within the V-Server application. The out-of-bounds write vulnerability is triggered, allowing the attacker to potentially overwrite adjacent memory regions. This could lead to several outcomes: 1) Information Disclosure: The attacker could overwrite memory containing sensitive data, allowing them to read it and potentially steal credentials, configuration details, or other valuable information. 2) Code Execution: The attacker could overwrite function pointers or other critical data structures, redirecting program execution to attacker-controlled code. This would allow the attacker to execute arbitrary code on the affected system, potentially leading to full system compromise. The attack vector is file-based and relies on social engineering to get the user to open the malicious VPR file.
3. Mitigation Recommendations
The primary mitigation is to upgrade to a version of V-Server or V-Server Lite later than V4.0.18.0. Fuji Electric provides downloads on their website: https://monitouch.fujielectric.com/site/download-e/03tellus_inf/index.php and https://hakko-elec.co.jp/site/download/03tellus_inf/index.php. If immediate patching is not feasible, implement the following: 1) Carefully vet VPR files received from external sources before opening them. 2) Consider isolating systems running V-Server/Lite to limit the impact of a potential compromise. 3) Monitor V-Server/Lite systems for unusual activity, such as unexpected process creation or network connections. 4) Employ endpoint detection and response (EDR) solutions to detect and respond to potential exploitation attempts.
4. Executive Summary
CVE-2023-47584 is an out-of-bounds write vulnerability affecting Fuji Electric’s V-Server and V-Server Lite software. A specially crafted VPR file can potentially allow an attacker to steal information or even take complete control of the affected system. While the likelihood of exploitation is moderate, the potential impact on confidentiality, integrity, and availability is significant. We recommend upgrading to the latest version of V-Server or V-Server Lite as soon as possible to mitigate this risk. If an immediate upgrade isn’t possible, careful vetting of VPR files and enhanced monitoring are crucial. Addressing this vulnerability is important to protect sensitive data and ensure continued reliable operation of systems utilizing Fuji Electric’s V-Server software.
Severity: Unknown
Description: Out-of-bounds read vulnerability exists in V-Server V4.0.18.0 and earlier and V-Server Lite V4.0.18.0 and earlier. If a user opens a specially crafted VPR file, information may be disclosed and/or arbitrary code may be executed.
CVSS Score: N/A
D
No data available.
No data available.
1. Risk Assessment
The vulnerability CVE-2023-47585 is an out-of-bounds read vulnerability affecting FUJI ELECTRIC CO., LTD. and Hakko Electronics Co., Ltd.'s V-Server and V-Server Lite software, versions 4.0.18.0 and earlier. An out-of-bounds read occurs when the software attempts to read data from a memory location outside of the allocated buffer. This can lead to information disclosure, potentially revealing sensitive data, and/or arbitrary code execution, allowing an attacker to gain control of the affected system. The business impact depends on the role of the V-Server/V-Server Lite within the organization. If used for critical monitoring or control, disruption or compromise could have significant operational consequences. Given the nature of the vulnerability, exploitation is considered moderately easy if an attacker can obtain or create a specially crafted VPR file. The likelihood of exploitation is moderate, depending on how widely VPR files are shared or accessed. Impacts to confidentiality are possible through information disclosure. Integrity could be compromised if arbitrary code is executed, allowing an attacker to modify data or system settings. Availability could be impacted if the vulnerability causes a system crash or denial of service. The EPSS score of 0.000620000 suggests a relatively low, but not negligible, risk.
2. Potential Attack Scenarios
A potential attack scenario involves a user receiving a seemingly legitimate VPR file via email or from a shared network drive. This VPR file has been crafted by an attacker to trigger the out-of-bounds read. When the user opens the file with V-Server or V-Server Lite, the application attempts to read data beyond the allocated buffer, potentially revealing sensitive system information such as memory contents, configuration details, or even credentials. In a more severe scenario, the crafted VPR file could contain data that, when read out of bounds, allows the attacker to execute arbitrary code on the system, giving them control over the affected V-Server instance. This could allow the attacker to install malware, steal data, or disrupt operations. The attack vector is file-based, relying on a user opening a malicious VPR file. The attack process involves crafting the VPR file, delivering it to the target user, and then having the user open the file with the vulnerable software. The potential outcome ranges from information disclosure to full system compromise.
3. Mitigation Recommendations
The primary mitigation for CVE-2023-47585 is to upgrade V-Server and V-Server Lite to a version later than 4.0.18.0. Fuji Electric provides updated versions on their website. Immediate action should be taken to patch all instances of V-Server and V-Server Lite. Organizations should also review their VPR file handling processes. Implement file validation where possible to ensure that VPR files are coming from trusted sources. Monitor network traffic for unusual activity after patching to identify any potential lingering effects of exploitation. Refer to the following resources for further information and download links:
https://monitouch.fujielectric.com/site/download-e/03tellus_inf/index.php
https://hakko-elec.co.jp/site/download/03tellus_inf/index.php
https://jvn.jp/en/vu/JVNVU93840158/
4. Executive Summary
CVE-2023-47585 is an out-of-bounds read vulnerability in FUJI ELECTRIC’s V-Server and V-Server Lite software that could lead to information disclosure or arbitrary code execution. This means an attacker could potentially steal sensitive data or gain control of systems running the vulnerable software by exploiting a specially crafted VPR file. While the immediate risk is moderate, the potential impact on confidentiality, integrity, and availability makes it important to address this vulnerability promptly. We recommend upgrading to the latest version of V-Server and V-Server Lite (beyond version 4.0.18.0) as soon as possible. This is a critical step in protecting our systems and data from potential compromise. Prioritizing this patch will minimize the risk of disruption and maintain the reliable operation of our V-Server infrastructure.
Severity: Unknown
Description: Multiple heap-based buffer overflow vulnerabilities exist in V-Server V4.0.18.0 and earlier and V-Server Lite V4.0.18.0 and earlier. If a user opens a specially crafted VPR file, information may be disclosed and/or arbitrary code may be executed.
CVSS Score: N/A
D
No data available.
No data available.
1. Risk Assessment
The vulnerability, CVE-2023-47586, involves multiple heap-based buffer overflow vulnerabilities within Fuji Electric’s V-Server and V-Server Lite software versions 4.0.18.0 and earlier. Heap-based buffer overflows occur when a program writes data beyond the allocated memory space on the heap, potentially overwriting adjacent data structures or executable code. The business impact is moderate to high, depending on the specific usage of V-Server/Lite. These applications likely handle critical data for industrial control systems (ICS) and building automation, meaning a compromise could disrupt operations, lead to data loss, or even impact physical processes. The likelihood of exploitation is considered moderate, as a specially crafted VPR file is required, suggesting some level of access or user interaction is necessary. However, if the VPR files are commonly shared or received from trusted but potentially vulnerable sources, the likelihood increases. The ease of exploitation is also moderate; while crafting the VPR file requires some understanding of the software's internal workings, exploit code may become readily available. Impacts on confidentiality include potential disclosure of sensitive data stored within the VPR file or adjacent memory. Integrity is impacted through the potential for arbitrary code execution, allowing an attacker to modify data or control the system. Availability can be impacted by a crash caused by the overflow, or by the execution of malicious code that disrupts normal operations. The EPSS score of 0.000570000 suggests a relatively low, but not insignificant, probability of exploitation in the wild.
2. Potential Attack Scenarios
An attacker could leverage this vulnerability by crafting a malicious VPR (likely a project file specific to V-Server) file and sending it to a user who regularly opens VPR files. The user, believing the file is legitimate, opens it with V-Server or V-Server Lite. The specially crafted VPR file contains data designed to overflow the heap buffer. This overflow overwrites adjacent memory, potentially overwriting a function pointer. When that function pointer is later called, it points to attacker-controlled code, granting the attacker arbitrary code execution with the privileges of the V-Server process. The attacker could then install malware, steal data, or disrupt the control system. The attack vector is file-based, requiring the user to open the malicious VPR file. The attack process involves crafting the VPR file, delivering it to the target, and exploiting the overflow upon opening. The potential outcome is full system compromise, depending on the privileges of the V-Server process and the attacker’s post-exploitation activities.
3. Mitigation Recommendations
The primary mitigation is to upgrade V-Server and V-Server Lite to a version later than 4.0.18.0. Fuji Electric has released updated versions to address these vulnerabilities. Ensure thorough testing of the updated versions within your environment before full deployment. In the interim, if patching cannot be done immediately, limit access to VPR files to trusted sources only. Implement file type validation and scanning on systems receiving VPR files to detect potentially malicious files. Consider using a memory protection tool or exploit mitigation technique to help detect and prevent heap overflows. Monitor V-Server and V-Server Lite processes for unusual activity, such as unexpected memory usage or network connections. Refer to the following resources for more information: https://monitouch.fujielectric.com/site/download-e/03tellus_inf/index.php, https://hakko-elec.co.jp/site/download/03tellus_inf/index.php, and https://jvn.jp/en/vu/JVNVU93840158/.
4. Executive Summary
V-Server and V-Server Lite software, used in industrial control and building automation, are vulnerable to heap-based buffer overflow vulnerabilities (CVE-2023-47586). This allows an attacker, by crafting a malicious project file (VPR), to potentially disclose sensitive data, disrupt operations, or even gain control of the affected system. While the likelihood of exploitation is moderate, the potential business impact is significant, particularly for organizations relying on these systems for critical processes. We recommend upgrading to the latest version of V-Server or V-Server Lite as soon as possible. Limiting access to VPR files and implementing file scanning are interim measures to reduce risk. Addressing this vulnerability is important to maintain the confidentiality, integrity, and availability of systems utilizing these Fuji Electric products and minimize potential disruptions to operations.