Nssm-2.24 Privilege Escalation __link__ 〈TESTED〉

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

Ensure that service installation directories have appropriate permissions. Vulnerabilities often arise because the parent directory—not the binary itself—has weak permissions that are inherited by child files. Secure both the binary and its containing folder.

Understanding NSSM 2.24 Privilege Escalation: Vulnerability Analysis and Remediation

The most significant and recent vulnerability affecting NSSM is tracked as . This flaw arises from improper permissions set on the nssm.exe executable file, allowing a low-privileged local attacker to escalate their privileges and gain full administrative access to the system. nssm-2.24 privilege escalation

NSSM is designed to keep services running. If a service crashes, NSSM restarts it. It is often used by developers to run scripts, Java applications, or custom binaries as background services. Version 2.24 was a standard release for a long period, but it contains a flaw in how it handles file permissions and service configurations. The Core Vulnerability: Weak Permissions

If you are running NSSM, understanding how an attacker can move from a low-privilege user to SYSTEM is critical for securing your infrastructure. What is NSSM?

This is the most important step. Ensure that the directory containing nssm.exe and the application it manages follows the . Only Administrators and SYSTEM should have write/modify access. 2. Secure the Registry If you’re a security researcher testing NSSM 2

The vulnerability is classified with a , characterized by:

To understand the privilege escalation vector, it is essential to look at how NSSM bridges the gap between interactive applications and the Windows Service Control Manager (SCM).

While "Write" is not a specific named feature within the tool itself, the vulnerability typically involves an attacker gaining to a directory where a service is installed or leveraging weak permissions on the NSSM executable itself to redirect service execution to a malicious payload. Privilege Escalation Mechanism Understanding NSSM 2

NSSM (Non-Sucking Service Manager) version 2.24 is a widely used tool for managing Windows services, but it presents specific security risks, primarily revolving around . While NSSM itself is not inherently "malicious," its misconfiguration or presence in a compromised environment can be leveraged by attackers to gain NT AUTHORITY\SYSTEM privileges. Deep Review of NSSM 2.24 Vulnerabilities 1. Unquoted Service Path (Most Common)

Windows services often execute under highly privileged accounts, such as NT AUTHORITY\SYSTEM , LocalService , or NetworkService . If a low-privileged user can manipulate how a privileged service starts, stops, or executes, they can trick the operating system into running arbitrary code with the service's elevated permissions. Why NSSM 2.24 Becomes a Target