CVE-2024-11787 is a stack-based buffer overflow vulnerability identified in Fuji Electric Monitouch V-SFT version 6.2.3.0, specifically within the parsing logic of V10 files. The vulnerability stems from insufficient validation of the length of user-supplied data before copying it into a fixed-size stack buffer. This improper bounds checking allows an attacker to overflow the buffer, overwriting adjacent memory on the stack, which can lead to arbitrary code execution within the context of the Monitouch V-SFT process. Exploitation requires user interaction, such as opening a maliciously crafted V10 file or visiting a malicious webpage that triggers the vulnerable file parsing. The vulnerability is categorized under CWE-121 (Stack-based Buffer Overflow) and has been assigned a CVSS v3.0 base score of 7.8, indicating high severity. The attack vector is local (AV:L) but does not require privileges (PR:N), though user interaction (UI:R) is necessary. The impact includes full compromise of confidentiality, integrity, and availability of the affected system. No patches or exploit code are currently publicly available, and no known exploits in the wild have been reported. The vulnerability was reported by the Zero Day Initiative (ZDI) as ZDI-CAN-24413. Given the critical role of Monitouch V-SFT in industrial automation and control systems, this vulnerability poses a significant risk to operational technology environments.

The vulnerability allows remote attackers to execute arbitrary code with the privileges of the Monitouch V-SFT process, potentially leading to full system compromise. This can result in unauthorized disclosure of sensitive operational data, manipulation or disruption of industrial control processes, and denial of service conditions. Given the typical deployment of Monitouch V-SFT in industrial automation environments, exploitation could disrupt manufacturing, energy production, or critical infrastructure operations. The requirement for user interaction limits the attack surface but does not eliminate risk, especially in environments where users may open files from untrusted sources or access untrusted web content. The compromise of such systems could have cascading effects on safety, reliability, and business continuity. Organizations may face operational downtime, financial losses, regulatory penalties, and reputational damage if exploited.

1. Apply patches or updates from Fuji Electric as soon as they become available to address this vulnerability. 2. Implement strict file validation and sandboxing for all V10 files before processing, including using whitelisting and file integrity checks. 3. Restrict user permissions to limit the ability to open untrusted files or access untrusted websites, especially on systems running Monitouch V-SFT. 4. Employ network segmentation to isolate industrial control systems from general IT networks and the internet to reduce exposure. 5. Use application whitelisting and endpoint protection solutions that can detect and block exploitation attempts. 6. Conduct user awareness training focused on the risks of opening files from untrusted sources and visiting suspicious websites. 7. Monitor logs and network traffic for unusual activity indicative of exploitation attempts. 8. Consider deploying intrusion detection/prevention systems tailored for industrial control environments to detect anomalous behavior related to this vulnerability.