CVE-2025-48811 in Windows
Summary
by MITRE • 07/08/2025
Missing support for integrity check in Windows Virtualization-Based Security (VBS) Enclave allows an authorized attacker to elevate privileges locally.
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Analysis
by VulDB Data Team • 06/06/2026
Windows Virtualization-Based Security VBS enclaves represent a critical security mechanism designed to protect sensitive data and operations by isolating them within secure hardware-enforced environments. The vulnerability arises from the absence of proper integrity checking mechanisms within these enclaves, creating a fundamental weakness that can be exploited by authorized individuals with local access. This flaw directly impacts the core security promises of VBS by allowing attackers who already possess legitimate system privileges to bypass the isolation protections that should prevent unauthorized access to enclave-protected resources.
The technical implementation of this vulnerability stems from the enclave's failure to validate the integrity of code and data that flows into the secure environment. When VBS enclaves lack robust integrity checks, they become susceptible to code injection attacks where malicious payloads can be introduced without detection. The absence of cryptographic validation mechanisms means that even authorized users with local access can manipulate enclave contents, effectively undermining the trust model that VBS enclaves are designed to establish. This weakness is particularly dangerous because it operates within the trusted execution environment where users expect maximum protection against both external and internal threats.
From an operational perspective, this vulnerability significantly weakens the security posture of systems relying on VBS enclaves for protecting sensitive operations such as credential storage, cryptographic key management, or secure boot processes. Attackers who gain local access can leverage this weakness to escalate their privileges beyond what should be possible within the normal security boundaries of the system. The impact extends beyond simple privilege escalation as it can potentially lead to complete system compromise, especially when combined with other vulnerabilities or when the enclave contains critical system components. The vulnerability affects organizations that deploy VBS enclaves for protecting sensitive data or operations, potentially exposing confidential information and undermining the trust in the platform's security guarantees.
The mitigation strategies for this vulnerability require both immediate and long-term approaches to address the fundamental architectural weakness. Microsoft should implement comprehensive integrity checking mechanisms within VBS enclaves, ensuring that all code and data entering the secure environment undergoes proper validation before execution. Organizations should conduct thorough assessments of their VBS enclave usage and consider alternative security models for protecting critical assets. The implementation of additional monitoring and detection capabilities within the enclave environment can help identify unauthorized modifications or access attempts. Security teams should also review their access control policies to minimize the attack surface available to authorized users who might exploit this vulnerability. This remediation effort aligns with the principles outlined in the CWE-347 vulnerability category, which focuses on improper validation of certificates and signatures, and follows the ATT&CK technique T1068 for local privilege escalation through trusted environment manipulation. The vulnerability demonstrates the critical importance of maintaining security boundaries even within trusted execution environments, as highlighted in the broader context of secure enclave design principles and the fundamental requirement for integrity protection in all security-critical components of modern computing platforms.