Skip to main content

Microsoft Windows 11 Version 24H2 Cross Device Service - Elevation of Privilege

High
Published: Mon Jun 09 2025 (06/09/2025, 00:00:00 UTC)
Source: Exploit-DB RSS Feed

Description

Microsoft Windows 11 Version 24H2 Cross Device Service - Elevation of Privilege

AI-Powered Analysis

AILast updated: 06/11/2025, 08:15:35 UTC

Technical Analysis

This security threat concerns an elevation of privilege vulnerability in Microsoft Windows 11 Version 24H2 and related versions, including Windows 11 23H2, 22H2, and Windows Server 2025 and 2022 (Server Core). The vulnerability resides in the Windows Cross Device Service, specifically involving improper access control (CWE-284) that allows a low-privileged local attacker to overwrite a critical DLL file named CrossDevice.Streaming.Source.dll located in a writable directory (C:/ProgramData/CrossDevice). The exploit requires user interaction, where the attacker convinces the user to open the "Mobile devices" Settings page, triggering the system to load the malicious DLL. The attacker first backs up the original DLL, then replaces it with a malicious DLL that executes code with SYSTEM privileges upon loading, effectively escalating privileges from a low-privileged user to SYSTEM level. The provided exploit code is a Python 3 script that automates the process of building the malicious DLL from C source code using gcc (MinGW), checks for the vulnerable DLL, backs it up, waits for the DLL to be unlocked, replaces it with the malicious DLL, and prompts the user to open the required Settings page to trigger the exploit. The malicious DLL, written in C, creates a file (C:\poc_only_admin_can_write_to_c.txt) as proof of successful SYSTEM privilege execution. The attack vector is local, requiring low privileges and user interaction, with a high impact on confidentiality, integrity, and availability due to full SYSTEM privilege escalation. The exploit code is mature enough to demonstrate the attack but is marked as unproven in the wild. No official patch links are provided yet, but remediation is expected via an official fix from Microsoft.

Potential Impact

For European organizations, this vulnerability poses a significant risk due to the potential for local attackers or malicious insiders to escalate privileges to SYSTEM level, gaining full control over affected Windows 11 and Windows Server systems. This can lead to unauthorized access to sensitive data, disruption of critical services, installation of persistent malware, and lateral movement within networks. Organizations relying on Windows 11 24H2 and related versions, especially those with users who have local access or where social engineering could induce user interaction, are at risk. The ability to overwrite a DLL in a writable directory indicates a failure in access control that could be exploited to bypass security controls and endpoint protection. The impact is particularly severe for sectors with high-value assets such as finance, healthcare, government, and critical infrastructure, where SYSTEM-level compromise can lead to data breaches, operational disruption, and compliance violations under GDPR and other regulations.

Mitigation Recommendations

1. Restrict write permissions on the directory C:/ProgramData/CrossDevice and the DLL CrossDevice.Streaming.Source.dll to prevent unauthorized modification. 2. Implement application whitelisting and integrity monitoring to detect unauthorized DLL changes. 3. Educate users to avoid opening the "Mobile devices" Settings page when prompted by untrusted sources to reduce user interaction exploitation. 4. Employ endpoint detection and response (EDR) tools to monitor for suspicious DLL replacement activities and privilege escalation attempts. 5. Temporarily disable or restrict the Cross Device Service if feasible until a patch is available. 6. Monitor Microsoft security advisories closely and apply official patches immediately upon release. 7. Use least privilege principles to limit local user rights and prevent low-privileged users from writing to system directories. 8. Conduct regular audits of writable directories and DLL files to identify unauthorized changes. 9. Implement network segmentation to limit the impact of compromised endpoints. 10. Prepare incident response plans specifically addressing privilege escalation scenarios.

Need more detailed analysis?Get Pro

Technical Details

Edb Id
52320
Has Exploit Code
true
Code Language
c

Indicators of Compromise

Exploit Source Code

Exploit Code

Exploit code for Microsoft Windows 11 Version 24H2 Cross Device Service - Elevation of Privilege

#!/usr/bin/env python3
# Exploit Title: Microsoft Windows 11 Version 24H2 Cross Device Service - Elevation of Privilege
# Author: Mohammed Idrees Banyamer
# Instagram: @banyamer_security
# GitHub: https://github.com/mbanyamer
# Date: 2025-06-06
# Tested on: Windows 11 Version 24H2 for x64-based Systems (10.0.26100.3476)
# CVE: CVE-2025-24076
#
# Affected Versions:
# - Windows 11 Version 24H2 (x64 and ARM64)
# - Windows 11 Version 23H2 (x64 and ARM64)
# - Windows 11 Version 22H2 (x64 and ARM64)
#
... (5099 more characters)
Code Length: 5,599 characters • Language: C/C++

Threat ID: 68489c7682cbcead92620a35

Added to database: 6/10/2025, 8:58:30 PM

Last enriched: 6/11/2025, 8:15:35 AM

Last updated: 8/18/2025, 3:20:28 PM

Views: 56

Actions

PRO

Updates to AI analysis are available only with a Pro account. Contact root@offseq.com for access.

Please log in to the Console to use AI analysis features.

Need enhanced features?

Contact root@offseq.com for Pro access with improved analysis and higher rate limits.

Latest Threats