CVE-2024-11789 is a stack-based buffer overflow vulnerability identified in Fuji Electric Monitouch V-SFT version 6.2.3.0, specifically in the parsing logic for V10 files. The vulnerability stems from inadequate validation of the length of user-supplied data before copying it into a fixed-size stack buffer. This lack of bounds checking allows an attacker to overflow the buffer, potentially overwriting the stack and enabling arbitrary code execution within the context of the running process. Exploitation requires user interaction, such as opening a maliciously crafted V10 file or visiting a malicious webpage that triggers the vulnerable parsing routine. The vulnerability is classified under CWE-121, indicating a classic stack-based buffer overflow. The CVSS v3.0 base score is 7.8, reflecting high impact on confidentiality, integrity, and availability, with low attack complexity and no privileges required, but user interaction needed. While no exploits are currently known in the wild, the vulnerability poses a significant risk due to the potential for remote code execution in industrial control system environments where Monitouch V-SFT is deployed. The vulnerability was reported by the Zero Day Initiative (ZDI) under identifier ZDI-CAN-24448 and publicly disclosed on November 27, 2024.

The vulnerability allows remote attackers to execute arbitrary code on affected systems, which can lead to full compromise of the Monitouch V-SFT application and potentially the underlying host system. This can result in unauthorized access to sensitive industrial control data, manipulation of control processes, disruption of operations, and potential safety hazards. The compromise of industrial control software can have cascading effects on critical infrastructure, manufacturing lines, and energy management systems. Given the high confidentiality, integrity, and availability impacts, exploitation could lead to data breaches, operational downtime, and loss of control over industrial processes. The requirement for user interaction limits the attack vector but does not eliminate risk, especially in environments where users may open files from untrusted sources or visit untrusted websites. The absence of known exploits in the wild currently reduces immediate risk but does not preclude future exploitation attempts.

1. Apply patches or updates from Fuji Electric as soon as they become available for Monitouch V-SFT version 6.2.3.0 or upgrade to a fixed version. 2. Implement strict file validation and filtering policies to prevent opening or processing untrusted or unsolicited V10 files. 3. Educate users on the risks of opening files from unknown or untrusted sources and visiting suspicious websites. 4. Employ network segmentation to isolate industrial control systems running Monitouch V-SFT from general IT networks and the internet to reduce exposure. 5. Use application whitelisting and endpoint protection solutions capable of detecting anomalous behavior or exploitation attempts related to buffer overflows. 6. Monitor logs and network traffic for unusual activity indicative of exploitation attempts. 7. Consider deploying intrusion detection/prevention systems (IDS/IPS) with signatures targeting this vulnerability once available. 8. Conduct regular security assessments and penetration testing focused on industrial control system software to identify and remediate similar vulnerabilities proactively.