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GitHubfevar54/cve-2026-20805-poc

CVE-2026-20805-POC

PoC de CVE-2026-20805: divulgacion de informacion en Desktop Window Manager (dwm.exe) de Windows.

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CVE-2026-20805 PoC

Proof of concept for the information disclosure vulnerability in Microsoft's Desktop Window Manager (dwm.exe).

📋 Vulnerability Summary

  • ID: CVE-2026-20805
  • Product: Microsoft Windows
  • Component: Desktop Window Manager (dwm.exe)
  • CWE-ID: CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor)
  • Severity (CVSS 3.1): 5.5 (Medium)
  • Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

A local, already authenticated attacker can exploit this vulnerability to disclose a section address of a remote ALPC (Asynchronous Local Procedure Call) port, constituting a user-mode memory leak.

🚨 Impact

Successful exploitation allows a low-privileged attacker to obtain sensitive memory information from other processes, which could be used as part of a larger-scale attack to evade defenses or gain higher privilege.

📂 Repository Structure

CVE-2026-20805-POC/ ├── poc/ # Contains the observation tool │ └── dumper.py # Script to monitor the information leak ├── docs/ # Technical analysis and references │ └── technical_analysis.md ├── scripts/ # Automation scripts │ └── setup_env.ps1 # PowerShell script to prepare the environment ├── .gitignore └── README.md

⚙️ How to Reproduce the Observation

  1. Clone this repository: bash git clone https://github.com/your-username/CVE-2026-20805-POC.git cd CVE-2026-20805-POC
  2. Prepare the environment (Optional): Run the PowerShell script to ensure you have the necessary tools. powershell .\scripts\setup_env.ps1
  3. Run the monitoring tool: Run the Python script to monitor processes and capture the data leak. bash python poc/dumper.py
  4. Observe the output: The script will display memory information that could be leaked by dwm.exe under certain conditions. Refer to docs/technical_analysis.md to interpret the results. ## 🛡️ Mitigation Apply the latest Microsoft security updates according to the published guidance. Consult the Microsoft security bulletin for the corresponding patches. ## 📄 References - Microsoft Security Update Guide - CISA Known Exploited Vulnerabilities Catalog - NVD - CVE-2026-20805 ## ⚠️ Warning This repository is for educational and research purposes only. The author is not responsible for the misuse of the information presented here. Use this tool responsibly and only on systems where you have explicit permission. ## 📜 License MIT License
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