## https://sploitus.com/exploit?id=D43554E4-B776-5421-BEDA-E17C7236A3D4
CVE-2026-25676 Research
DLL Search Path Hijacking in M-Track Duo HD Installer
Overview
This repository contains initial research and a proof-of-concept related to CVE-2026-25676, a DLL search path hijacking vulnerability affecting the installer of M-Track Duo HD 1.0.0.
The goal of this project is to document the root cause, impact, and detection opportunities associated with this class of vulnerability, with a focus on adversary simulation, defensive visibility, and security research.
This work is intended for educational and defensive security purposes.
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Vulnerability Summary
CVE-2026-25676 is classified as an Uncontrolled Search Path Element (CWE-427). The installer loads external libraries without enforcing a secure and deterministic resolution path. As a result, a malicious DLL placed in a controllable directory may be loaded by a privileged process.
This can lead to:
• Local privilege escalation
• Arbitrary code execution in a trusted context
• Persistence opportunities
• Evasion of traditional application allow-listing controls
The vulnerability requires user interaction, typically through execution of the installer.
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Why This Matters
DLL search order hijacking remains relevant in modern enterprise environments because:
• It abuses legitimate binaries and trusted execution flows.
• It often bypasses signature-based detection.
• It can operate in environments with EDR and application control.
• It enables reliable privilege escalation.
• It supports supply-chain and social engineering attack scenarios.
This technique is mapped to MITRE ATT&CK:
• T1574 (Hijack Execution Flow)
• T1574.001 (DLL Search Order Hijacking)
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Research Objectives
This repository aims to:
1. Document the technical behavior of the vulnerable installer.
2. Analyze library resolution and loading behavior.
3. Identify the root cause and unsafe loading patterns.
4. Provide a minimal PoC demonstrating code execution.
5. Explore detection strategies and telemetry.
6. Support adversary simulation and BAS scenarios.
7. Contribute to defensive research and awareness.
This is not intended to provide weaponized exploitation.
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Proof of Concept
The included PoC demonstrates that a malicious DLL may be loaded during installation. Instead of executing a harmful payload, the DLL creates a benign marker file in the temporary directory to confirm code execution.
The PoC:
• Generates a malicious DLL.
• Places it next to the vulnerable installer.
• Executes the installer.
• Verifies successful execution through artifact creation.
This approach enables safe validation in controlled environments.
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Technical Background
Windows resolves DLLs using a search order when a library is referenced without an absolute path. The order typically includes:
1. Application directory
2. System directories
3. Environment paths
4. Current working directory
If the application uses insecure loading functions (for example, default LoadLibrary behavior), attackers may influence resolution.
Common causes include:
• Relative paths
• Lack of integrity validation
• Legacy dependencies
• Unsafe API usage
• Missing safe DLL loading flags
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Threat Model
Typical attack scenarios include:
• Supply chain compromise
• Social engineering distribution
• Software bundling
• USB or removable media
• Local persistence via trusted software
The attacker’s goal is to gain execution in a privileged context.
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Detection Opportunities
Defenders can detect this class of activity by monitoring:
• DLL loads from non-standard directories
• Unsigned or untrusted libraries
• Suspicious working directory manipulation
• Elevated processes loading unexpected dependencies
• Library loads originating from user-controlled paths
Relevant telemetry sources include:
• Sysmon
• ETW
• EDR behavioral signals
• Process and module load tracking
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Defensive Mitigations
Recommended controls:
• Enforce SafeDllSearchMode
• Use absolute library paths
• Validate digital signatures
• Harden installation workflows
• Restrict write access to executable directories
• Monitor privileged execution chains
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Research Roadmap
Future work may include:
• Static and dynamic reversing of the installer
• Dependency tracing and patch diffing
• Identification of additional vulnerable modules
• Comparison with similar vulnerabilities in installers
• Development of BAS scenarios for validation
• Detection engineering and rule development
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Responsible Use
This repository is provided for research and defensive security. It must only be used in authorized environments and controlled laboratory conditions.
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Disclaimer
The author is not responsible for misuse of this material. Users are responsible for ensuring legal and ethical compliance.
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How to Run the Proof of Concept
This PoC is designed to be executed only in an isolated and authorized test environment. Do not run it on production systems.
Requirements
Before running the PoC, ensure the following:
• A Windows test environment (virtual machine recommended).
• The vulnerable installer: M-Track Duo HD 1.0.0.
• Python 3 installed.
• Administrator privileges.
• Antivirus or EDR disabled or configured to allow controlled testing.
• The system should not contain sensitive or production data.
A disposable VM snapshot is strongly recommended.
Step 1 – Prepare the Environment
Create a clean working directory and copy the vulnerable installer into it.
Example:
C:\lab\cve-2026-25676\
Place the installer in this folder.
Step 2 – Configure the Embedded DLL
The PoC script contains an embedded DLL encoded in base64. Before execution:
1. Compile the provided DLL source using a Windows-compatible toolchain (such as MinGW).
2. Encode the generated DLL in base64.
3. Replace the placeholder inside the script.
This DLL is intentionally benign. It only creates a marker file to demonstrate code execution.
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Step 3 – Run the Script
Execute the PoC:
python poc_cve-2026-25676.py [dll_name]
exampel:
python poc_cve-2026-25676.py M-Track_Duo_HD_1.0.0.exe version.dll
If the installer requires elevation, accept the UAC prompt.
Step 4 – Validate Execution
If the vulnerability is successfully triggered, the malicious DLL will be loaded during the installation process. The PoC will create a marker file:
%TEMP%\poc_cve-2026-25676.txt
The presence of this file confirms that code execution occurred in the context of the installer.
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Step 5 – Troubleshooting
If the marker file is not created, consider the following:
• The DLL name may not match the expected dependency.
• The installer may not load the targeted library.
• Architecture mismatch (32-bit vs 64-bit).
• Security controls blocking DLL execution.
• The working directory may not influence the search path.
• The installer may use secure loading mechanisms.
Further analysis of library dependencies may be required.
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Step 6 – Cleanup
The script attempts to remove the generated DLL automatically. However, manual cleanup is recommended to restore the test environment.
Reverting the VM snapshot after testing is the safest option.