Nssm-2.24 Privilege Escalation -

registry entry is not enclosed in double quotes, it is vulnerable to "Unquoted Service Path" exploitation. The Attack

This article is intended for security professionals and system administrators for defensive purposes only. Understanding attack techniques is essential for implementing effective defenses. Always ensure you have proper authorization before testing security vulnerabilities and adhere to responsible disclosure practices.

3. Implement the Principle of Least Privilege for Service Accounts

Securing NSSM 2.24 deployments requires adhering to the principle of least privilege and ensuring rigid access controls. 1. Enforce Strict File and Folder ACLs nssm-2.24 privilege escalation

An attacker generally follows these steps to exploit a misconfigured NSSM instance:

In this simplified scenario, the Authenticated Users:C permission indicates that any authenticated user has Change permission—the critical weakness that enables the attack.

The most common ways privilege escalation occurs involving NSSM 2.24 include: 1. Insecure File Permissions registry entry is not enclosed in double quotes,

icacls "C:\Path\To\nssm.exe" /grant "SYSTEM:(F)" icacls "C:\Path\To\nssm.exe" /grant "Administrators:(F)"

Vendor guidance and disclosure practices

NSSM (the Non-Sucking Service Manager) has long been a trusted tool for Windows system administrators. Its ability to wrap virtually any executable into a Windows service made it indispensable for deploying applications like Nginx, Redis, Elasticsearch, and Python scripts as reliable background services. However, with great power comes great vulnerability. This article provides an in-depth examination of the privilege escalation vulnerabilities associated with NSSM version 2.24, offering technical analysis, exploitation methodologies, impact assessment, and comprehensive mitigation strategies for security professionals and system administrators. Always ensure you have proper authorization before testing

$ icacls nssm.exe nssm.exe Everyone:(I)(F) # <-- Full control for Everyone!

If you’re a security researcher testing NSSM 2.24 in a lab, review:

I can provide to manually audit your current NSSM services or help you harden the registry keys for an existing setup. Which would you prefer? CVE-2016-20033 Detail - NVD

When the service restarts (either via a system reboot or if the user has permissions to restart the service), NT AUTHORITY\SYSTEM executes the malicious binary, granting the attacker full control over the machine. 2. Insecure Registry Permissions