CVE-2025-24076: Windows 11 22H2 Privilege Escalation Flaw

CVE-2025-24076 Overview

CVE-2025-24076 is an improper access control vulnerability in the Windows Cross Device Service that allows an authorized attacker to elevate privileges locally. The Windows Cross Device Service is a component that enables seamless connectivity and data sharing between Windows devices and other platforms, including mobile devices. This vulnerability stems from inadequate access control mechanisms within the service, potentially allowing a low-privileged user to escalate their privileges on affected systems.

Critical Impact

Local privilege escalation could allow attackers with initial system access to gain elevated privileges, potentially compromising confidentiality, integrity, and availability of the affected Windows system.

Affected Products

• Microsoft Windows 11 22H2
• Microsoft Windows 11 23H2
• Microsoft Windows 11 24H2
• Microsoft Windows Server 2022 23H2
• Microsoft Windows Server 2025

Discovery Timeline

• 2025-03-11 - CVE-2025-24076 published to NVD
• 2025-07-07 - Last updated in NVD database

Technical Details for CVE-2025-24076

Vulnerability Analysis

This vulnerability is classified under CWE-284 (Improper Access Control), indicating that the Windows Cross Device Service fails to properly restrict access to privileged functionality. The flaw requires local access and user interaction to exploit, meaning an attacker must already have some level of authenticated access to the target system. Once exploited, the attacker can elevate their privileges, potentially gaining administrative control over the affected system.

The Windows Cross Device Service facilitates cross-platform device connectivity features introduced in recent Windows versions. The improper access control within this service creates a pathway for privilege escalation when the service processes requests from authenticated users without properly validating their authorization level.

Root Cause

The root cause of CVE-2025-24076 lies in improper access control mechanisms within the Windows Cross Device Service. The service does not adequately verify that authenticated users have appropriate permissions before allowing them to perform privileged operations. This access control gap allows attackers with low-level privileges to invoke functionality that should be restricted to higher-privileged accounts.

Attack Vector

The attack vector for this vulnerability is local, requiring the attacker to have authenticated access to the target system. The exploitation requires user interaction, suggesting that some form of social engineering or user action may be necessary to trigger the vulnerable code path. An attacker could potentially craft a malicious payload or sequence of operations that, when executed under a low-privileged user context, leverages the improper access control to escalate privileges.

The vulnerability affects core Windows operating systems including both client (Windows 11) and server (Windows Server 2022 and 2025) editions, making it particularly concerning for enterprise environments where privilege escalation could lead to lateral movement and broader compromise.

Detection Methods for CVE-2025-24076

Indicators of Compromise

• Unusual process execution or service behavior associated with the Windows Cross Device Service (CrossDeviceService.exe or related components)
• Unexpected privilege elevation events in Windows Security logs (Event ID 4672, 4673)
• Anomalous access patterns to Windows Cross Device Service registry keys or configuration files
• Process creation events showing low-privileged users spawning elevated processes through the Cross Device Service

Detection Strategies

• Monitor Windows Security Event logs for privilege escalation attempts, particularly Event IDs related to special privilege use and sensitive privilege use
• Implement behavioral monitoring to detect unusual Cross Device Service activity or unexpected child processes
• Deploy endpoint detection rules targeting access control bypass patterns in Windows services
• Use SentinelOne's behavioral AI to identify privilege escalation attempts that deviate from normal user behavior patterns

Monitoring Recommendations

• Enable enhanced auditing for Windows Cross Device Service operations
• Configure Windows Event Forwarding to centralize security logs for analysis
• Implement real-time alerting for privilege escalation indicators on systems running affected Windows versions
• Review and baseline normal Cross Device Service usage patterns to identify anomalous activity

How to Mitigate CVE-2025-24076

Immediate Actions Required

• Apply the Microsoft security update addressing CVE-2025-24076 immediately on all affected Windows 11 and Windows Server systems
• Prioritize patching for systems in sensitive environments or those accessible to multiple users
• Review and audit current user privilege levels to minimize the number of accounts that could potentially exploit this vulnerability
• Consider temporarily disabling the Windows Cross Device Service on critical systems if the feature is not required and patching cannot be immediately applied

Patch Information

Microsoft has released security updates to address this vulnerability. Administrators should consult the Microsoft Security Response Center Advisory for CVE-2025-24076 for specific patch versions and deployment guidance. The patches should be applied through Windows Update, Windows Server Update Services (WSUS), or Microsoft Endpoint Configuration Manager depending on the organization's patch management infrastructure.

Workarounds

• If immediate patching is not possible, consider disabling the Windows Cross Device Service through Services management console (services.msc) or Group Policy
• Implement application control policies to restrict execution of untrusted code on affected systems
• Apply the principle of least privilege to limit user accounts to minimum necessary permissions
• Enable Windows Defender Credential Guard and other security features to limit the impact of potential privilege escalation

# Disable Windows Cross Device Service via PowerShell (temporary workaround)
Stop-Service -Name "CrossDeviceService" -Force
Set-Service -Name "CrossDeviceService" -StartupType Disabled