CVE-2023-36657 in MetaDefender KIOSK
Summary
by MITRE • 09/15/2023
An issue was discovered in OPSWAT MetaDefender KIOSK 4.6.1.9996. Built-in features of Windows (desktop shortcuts, narrator) can be abused for privilege escalation.
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Analysis
by VulDB Data Team • 01/14/2026
The vulnerability identified as CVE-2023-36657 resides within OPSWAT MetaDefender KIOSK version 4.6.1.9996, representing a critical privilege escalation flaw that leverages native Windows functionalities. This issue demonstrates how seemingly benign system components can be exploited to gain elevated system privileges, undermining the security posture of kiosk environments that rely on restricted user access. The vulnerability specifically targets the interaction between the kiosk application and Windows built-in features, creating an attack surface that allows unauthorized privilege elevation through legitimate system mechanisms.
The technical exploitation occurs through the abuse of Windows desktop shortcuts and the narrator accessibility feature, which are typically designed to assist users with disabilities or provide automated system interaction. These components are not properly restricted within the kiosk environment, allowing attackers to manipulate their behavior to execute arbitrary code with higher privileges. The flaw stems from inadequate input validation and privilege separation mechanisms within the MetaDefender KIOSK application, which fails to properly sandbox or restrict access to these system-level features. This represents a classic case of insufficient privilege separation where the kiosk application does not adequately isolate its operations from system-level functionalities that could be leveraged for escalation.
The operational impact of this vulnerability is severe for organizations deploying MetaDefender KIOSK in production environments, particularly in scenarios where kiosk systems are used for sensitive operations or require strict access controls. Attackers could potentially escalate from standard user privileges to administrative rights, enabling them to modify system configurations, install malicious software, or access restricted data. The vulnerability is particularly concerning in environments where kiosk systems are deployed in public or unattended locations, as it provides a pathway for unauthorized individuals to gain complete control over the affected systems. Organizations relying on this kiosk solution for security operations may find their entire security infrastructure compromised through this single vulnerability.
Mitigation strategies should focus on immediate patching of the MetaDefender KIOSK application to the latest version that addresses this privilege escalation flaw. System administrators should also implement additional security controls such as disabling unnecessary accessibility features, enforcing strict application whitelisting policies, and monitoring for unauthorized privilege escalation attempts. The vulnerability aligns with CWE-276, which addresses improper privilege management, and maps to ATT&CK techniques including privilege escalation through accessibility features and abuse of system privileges. Organizations should conduct thorough security assessments of their kiosk deployments to identify similar vulnerabilities and implement comprehensive monitoring solutions to detect potential exploitation attempts. Regular security updates and proper configuration management are essential to prevent exploitation of this class of vulnerabilities in deployed systems.