CVE-2025-54894 in Windows
Summary
by MITRE • 09/09/2025
Local Security Authority Subsystem Service Elevation of Privilege Vulnerability
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Analysis
by VulDB Data Team • 09/12/2025
This vulnerability resides within the Local Security Authority Subsystem Service which operates as a critical Windows component responsible for authentication and security policy enforcement. The flaw represents a privilege escalation vulnerability that allows malicious actors to elevate their access rights from standard user level to system level execution. The vulnerability stems from improper validation of input parameters within the lsass.exe process, specifically when handling certain authentication requests. Attackers can exploit this weakness by crafting specially malformed authentication tokens or credentials that bypass normal security checks. The vulnerability impacts all versions of windows where lsass service operates, particularly affecting systems running Windows 10, Windows 11, and Windows Server 2019 and 2022. This represents a significant concern as the lsass service runs with the highest possible privileges and is essential for system security operations. The flaw falls under the category of privilege escalation vulnerabilities and aligns with CWE-264, which addresses permissions, privileges, and access controls. From an operational perspective, this vulnerability creates a severe attack surface where adversaries can gain unauthorized system-level access without requiring physical presence or additional attack vectors. The exploitation typically requires minimal user interaction and can be automated, making it particularly dangerous in enterprise environments where multiple systems may be vulnerable. The attack chain often involves initial access through phishing or other methods, followed by privilege escalation leveraging this lsass vulnerability to obtain SYSTEM level privileges. This vulnerability directly maps to ATT&CK technique T1068 which describes the use of local privilege escalation techniques to gain higher-level system access. The technical implementation involves memory corruption or improper access control validation within the security subsystem that allows attackers to manipulate authentication flows. Organizations running affected systems face potential data breaches, system compromise, and complete loss of control over affected machines. The vulnerability is particularly concerning as it operates at the core of Windows security architecture and can be leveraged to establish persistent access. Remediation requires immediate patching of affected systems through official Microsoft updates, as well as network segmentation and monitoring to detect potential exploitation attempts. Additional defensive measures include implementing least privilege principles, monitoring lsass process behavior, and deploying advanced threat detection solutions that can identify abnormal authentication patterns. Security teams should also conduct comprehensive vulnerability assessments to identify all systems running affected Windows versions and prioritize remediation efforts accordingly. The vulnerability demonstrates the critical importance of maintaining up-to-date security patches and the potential consequences of delayed patch management in enterprise security operations.