CVE-2025-53396 is a high-severity vulnerability affecting DOS Co., Ltd.'s SS1 product, specifically versions 16.0.0.10 and earlier (including Media version 16.0.0a and earlier) running under the MacOS environment. The vulnerability arises from incorrect permission assignments on critical resources within the SS1 software. This misconfiguration allows users who have legitimate login access to a client terminal to escalate their privileges to root level. The vulnerability does not require user interaction but does require the attacker to have low-level privileges (login access) on the affected system. The CVSS v3.0 score is 7.0, indicating a high severity with impacts on confidentiality, integrity, and availability. The attack vector is local (AV:L), with high attack complexity (AC:H), requiring low privileges (PR:L), and no user interaction (UI:N). The scope is unchanged (S:U), but the impact on confidentiality, integrity, and availability is high (C:H/I:H/A:H). Although no known exploits are currently reported in the wild, the vulnerability presents a significant risk because it enables privilege escalation to root, which could lead to full system compromise, unauthorized data access, and disruption of services. The vulnerability is limited to MacOS environments, which narrows the affected systems but still poses a critical risk to organizations using SS1 on MacOS. The lack of available patches at the time of publication increases the urgency for mitigation and monitoring.

For European organizations using DOS Co., Ltd.'s SS1 product on MacOS, this vulnerability could lead to severe consequences. An attacker with low-level access could escalate privileges to root, potentially gaining full control over affected systems. This could result in unauthorized access to sensitive data, disruption of critical business operations, and the deployment of further malicious activities such as lateral movement within networks or installation of persistent backdoors. Given the high impact on confidentiality, integrity, and availability, organizations in sectors with strict data protection requirements (e.g., finance, healthcare, government) could face regulatory penalties and reputational damage if exploited. The local attack vector means that insider threats or compromised user accounts pose a significant risk. The absence of known exploits in the wild currently reduces immediate risk but does not eliminate the threat, especially as attackers may develop exploits once the vulnerability details are public. The MacOS limitation means organizations heavily reliant on MacOS for critical operations are more vulnerable, while others may be less impacted.

1. Immediate mitigation should focus on restricting login access to SS1 client terminals to trusted users only, minimizing the risk of privilege escalation by unauthorized personnel. 2. Implement strict access controls and monitoring on MacOS systems running SS1 to detect unusual privilege escalation attempts or suspicious activities. 3. Employ endpoint security solutions capable of detecting privilege escalation behaviors and enforce application whitelisting to prevent unauthorized code execution. 4. Regularly audit permissions and configurations on SS1 installations to identify and correct incorrect permission assignments proactively. 5. Engage with DOS Co., Ltd. for timely updates or patches addressing this vulnerability; apply patches as soon as they become available. 6. Consider isolating MacOS systems running SS1 in segmented network zones with limited access to reduce potential lateral movement. 7. Educate users with login access about the risks and signs of compromise to enhance early detection. 8. If possible, temporarily limit or disable SS1 usage on MacOS environments until a patch is released, or consider alternative solutions if critical.