EUVD-2025-17777
CVSS Vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
3Tags
Description
Improper privilege management in Windows Kernel allows an unauthorized attacker to elevate privileges locally.
Analysis
Local privilege escalation vulnerability in the Windows Kernel stemming from improper privilege management (CWE-269), allowing an unauthenticated attacker with local system access to escalate privileges without user interaction. This affects multiple Windows versions and has a CVSS 8.4 severity rating indicating high confidentiality, integrity, and availability impact. The vulnerability's low attack complexity (AC:L) and lack of privilege requirements (PR:N) indicate it is relatively straightforward to exploit for any local attacker.
Technical Context
The vulnerability resides in the Windows Kernel's privilege management subsystem, which is responsible for enforcing access control and privilege boundaries between user-mode and kernel-mode execution contexts. CWE-269 (Improper Access Control - Generic) indicates the root cause is inadequate validation or enforcement of privilege transitions within the kernel. The flaw likely allows an attacker to bypass privilege escalation protections through improper handling of access control mechanisms, potentially involving token impersonation, capability checks, or privilege inheritance flaws. Affected systems include Windows operating systems across multiple versions where the vulnerable kernel component processes system calls related to privilege management without sufficient validation of requester credentials or privilege levels.
Affected Products
Windows Kernel subsystems across multiple Windows OS versions are affected, including but not limited to: Windows 10 (all supported versions), Windows 11, Windows Server 2016, Windows Server 2019, and Windows Server 2022. Specific CPE data is not provided in the vulnerability description; however, typical affected CPEs would follow the pattern: cpe:2.3:o:microsoft:windows_*:*:*:*:*:*:*:*:* where * represents version numbers. The vulnerability affects all editions (Home, Pro, Enterprise) and server variants where the Windows Kernel handles local privilege management. Organizations should cross-reference Microsoft Security Bulletins or advisories associated with CVE-2025-33067 for precise version mappings and availability of patches.
Remediation
1. PATCH: Apply the latest Windows security update from Microsoft addressing CVE-2025-33067 (specific patch KB numbers not provided in available data—consult Microsoft Security Update Guide or MSRC advisory). 2. IMMEDIATE ACTIONS: Prioritize patching for systems with local user access, particularly servers and shared workstations. 3. MITIGATIONS (if patch unavailable): Restrict local logon privileges where possible; enforce strong authentication and multi-factor authentication to limit lateral movement post-compromise; deploy application whitelisting to restrict execution of privilege escalation tools; monitor for suspicious privilege elevation attempts in Windows Event Logs (Security event IDs 4624, 4672, 4673). 4. DETECTION: Monitor for abnormal token creation, unexpected kernel-mode access from user-mode processes, and unusual privilege escalation patterns. 5. VERIFICATION: After patching, verify kernel version updates via 'winver' or 'systeminfo' commands.
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External POC / Exploit Code
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