CVE-2025-24073: Windows 10 1507 Privilege Escalation Flaw

CVE-2025-24073 Overview

CVE-2025-24073 is a local privilege escalation vulnerability affecting the Windows Desktop Window Manager (DWM) Core Library. The vulnerability stems from improper input validation within the DWM Core Library, which allows an authorized attacker with local access to elevate their privileges on the affected system. DWM is a critical Windows component responsible for visual effects and window composition on the desktop, making this a significant security concern across virtually all modern Windows deployments.

Critical Impact

An attacker who successfully exploits this vulnerability could gain elevated privileges on affected Windows systems, potentially obtaining SYSTEM-level access from a standard user account. This could enable full system compromise, including the ability to install programs, modify or delete data, and create new accounts with full user rights.

Affected Products

• Microsoft Windows 10 (versions 1507, 1607, 1809, 21H2, 22H2)
• Microsoft Windows 11 (versions 22H2, 23H2, 24H2)
• Microsoft Windows Server 2016, 2019, 2022, 2022 23H2, and 2025

Discovery Timeline

• 2025-04-08 - CVE-2025-24073 published to NVD
• 2025-07-03 - Last updated in NVD database

Technical Details for CVE-2025-24073

Vulnerability Analysis

This vulnerability is classified as CWE-20 (Improper Input Validation). The Windows Desktop Window Manager Core Library fails to properly validate certain input parameters before processing them. This improper validation allows a locally authenticated attacker to manipulate input in a way that bypasses security controls and elevates their privilege level.

The DWM Core Library (dwmcore.dll) handles the compositing engine for the Windows desktop environment, managing visual elements such as window transparency, animations, and thumbnail previews. Due to its deep integration with the Windows graphical subsystem, vulnerabilities in this component can have severe security implications, as DWM processes often run with elevated privileges.

Root Cause

The root cause of this vulnerability lies in insufficient input validation within the DWM Core Library. When processing certain requests or data structures, the library does not adequately verify the validity, bounds, or format of input parameters. This oversight allows an attacker to craft malicious input that, when processed by the DWM service, results in unintended behavior that can be leveraged for privilege escalation.

Attack Vector

The attack requires local access to the target system with valid user credentials. An attacker must first gain code execution on the system through another means (such as social engineering, malware, or another vulnerability) before they can exploit this vulnerability. Once local access is achieved, the attacker can interact with the DWM Core Library through specially crafted API calls or data structures to trigger the improper input validation flaw.

The exploitation flow typically involves:

1. Establishing local access to a target Windows system with standard user privileges
2. Crafting malicious input designed to exploit the input validation weakness
3. Triggering the vulnerable code path within the DWM Core Library
4. Leveraging the resulting behavior to escalate privileges to SYSTEM level

Detection Methods for CVE-2025-24073

Indicators of Compromise

• Unusual process activity involving dwm.exe or processes loading dwmcore.dll with suspicious parent processes
• Unexpected privilege escalation events in Windows Security Event logs (Event ID 4672, 4624)
• Anomalous API calls targeting DWM-related functions from non-standard applications
• Creation of new privileged accounts or modification of existing account privileges following suspicious DWM activity

Detection Strategies

• Monitor for unusual process behavior where low-privileged processes spawn or interact with high-privileged system services
• Implement behavioral analysis to detect privilege escalation patterns involving graphical subsystem components
• Deploy endpoint detection solutions capable of identifying exploitation attempts against Windows system libraries
• Correlate Windows Security events with process creation events to identify potential exploitation chains

Monitoring Recommendations

• Enable verbose logging for Windows Security events, particularly those related to privilege changes and authentication
• Configure SentinelOne Singularity Platform to monitor for suspicious DWM-related activity and local privilege escalation attempts
• Establish baseline behavior for DWM processes and alert on deviations from normal operation
• Implement file integrity monitoring for critical system libraries including dwmcore.dll

How to Mitigate CVE-2025-24073

Immediate Actions Required

• Apply the latest Microsoft security updates immediately to all affected Windows systems
• Prioritize patching for systems with multiple users or those accessible to untrusted parties
• Review and restrict local access to critical systems where possible
• Ensure endpoint protection solutions are updated with the latest detection signatures

Patch Information

Microsoft has released security updates to address this vulnerability. Administrators should consult the Microsoft Security Response Center advisory for specific patch information and download links. The patches are available through Windows Update, Windows Server Update Services (WSUS), and the Microsoft Update Catalog.

Organizations should prioritize patching based on their risk assessment, considering factors such as system exposure, user access levels, and the criticality of affected systems.

Workarounds

• Restrict local logon access to sensitive systems to only essential personnel until patches can be applied
• Implement the principle of least privilege across all user accounts to minimize the impact of potential exploitation
• Consider network segmentation to limit lateral movement opportunities if an attacker achieves elevated privileges
• Monitor privileged account usage closely and investigate any anomalous activity promptly

# Verify patch status using PowerShell
# Check if the system has recent security updates applied
Get-HotFix | Where-Object {$_.InstalledOn -gt (Get-Date).AddDays(-30)} | Format-Table -AutoSize

# Review Windows Update history for security updates
Get-WindowsUpdateLog