CVE-2025-27728 in Windows
Summary
by MITRE • 04/08/2025
Out-of-bounds read in Windows Kernel-Mode Drivers allows an authorized attacker to elevate privileges locally.
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Analysis
by VulDB Data Team • 04/08/2025
This vulnerability represents a critical security flaw within the windows kernel-mode driver subsystem that enables local privilege escalation through out-of-bounds memory access. The issue manifests when kernel-mode drivers fail to properly validate input parameters or buffer boundaries during processing operations, creating opportunities for unauthorized code execution with elevated privileges. Such vulnerabilities typically arise from insufficient bounds checking mechanisms in driver code that handle user-supplied data or system calls. The attack vector requires an authenticated local user who can execute malicious code within the kernel context, leveraging the out-of-bounds read condition to manipulate memory layout and potentially gain SYSTEM-level access. This type of vulnerability directly maps to common weakness enumerations such as cwe-125 out-of-bounds read and cwe-787 out-of-bounds write, both of which are classified as high-risk issues in the software security domain.
The operational impact of this vulnerability extends beyond simple privilege escalation as it fundamentally undermines the integrity of the windows kernel security model. Kernel-mode drivers operate with the highest privilege level on the system, making any flaw in their implementation potentially catastrophic for overall system security. An attacker who successfully exploits this condition can bypass standard user-mode security controls and gain unrestricted access to system resources, including the ability to read or modify any memory location, manipulate process execution, and potentially establish persistent backdoors. This vulnerability particularly aligns with attack techniques described in the attack tree framework where local privilege escalation represents a critical stepping stone for attackers seeking to achieve broader system compromise. The exploitation typically involves crafting specific inputs that trigger the out-of-bounds condition, potentially leading to information disclosure or code execution within kernel space.
Mitigation strategies for this class of vulnerability must address both immediate remediation and long-term architectural improvements in driver development practices. Microsoft recommends applying security patches promptly when available through windows update mechanisms, as these typically contain fixes for known kernel-mode vulnerabilities. Organizations should implement robust driver signing policies to ensure only trusted code executes in kernel space, while also establishing comprehensive monitoring for anomalous kernel activity patterns that might indicate exploitation attempts. The defense-in-depth approach requires implementing memory protection mechanisms such as address space layout randomization and kernel address space layout randomization to make exploitation more difficult. Additionally, regular security assessments of kernel-mode components should include thorough code reviews focusing on input validation and bounds checking practices, with adherence to secure coding guidelines that prevent common vulnerability patterns like those defined in the cwe dictionary. System administrators must also consider implementing principle of least privilege controls and maintaining detailed audit logs to detect potential exploitation attempts as early as possible.