Nssm-2.24 Privilege Escalation ~upd~ -

: Upon service installation or startup, NSSM should scan its own binary path and the target application path. It would flag if high-risk groups (e.g., "Everyone," "Users," or "Authenticated Users") have Write or Full Control permissions.

Or simpler: try to change the binary path.

refers to a high-severity local security flaw (tracked globally under vulnerabilities like CVE-2025-41686 ) where weak file or directory permissions allow a low-privileged local user to hijack the Non-Sucking Service Manager (NSSM) binary and execute arbitrary code with administrative or NT AUTHORITY\SYSTEM rights. Because NSSM version 2.24 is widely bundled by third-party Windows installers to run scripts and applications as native background processes, a misconfiguration in its deployment represents a major attack vector for infrastructure compromise. 🛠️ The Role of NSSM 2.24 in Windows Environments nssm-2.24 privilege escalation

Newer versions of NSSM (2.24 is the last stable release as of 2016; no official updates after) do not address these privilege escalation vectors. However, the problem is less about a bug in NSSM and more about combined with NSSM’s lack of built-in security hardening. Attackers target version 2.24 because:

The most common exploit vector against NSSM 2.24 is the vulnerability, which is a classic Windows misconfiguration. A. The Mechanism : Upon service installation or startup, NSSM should

The risk is too high for any environment with multiple users or exposure to untrusted code. The convenience of NSSM does not outweigh the privilege escalation threat. Even if you "trust" your users, malware running as a user can rapidly abuse NSSM to gain SYSTEM.

Windows Privilege Escalation — Part 1 (Unquoted Service Path) refers to a high-severity local security flaw (tracked

The impact of successfully exploiting an NSSM privilege escalation is .

The contractor replaces monitor.exe with a reverse shell payload compiled as a Windows service executable. Upon the next scheduled restart (or triggered manually), the shell pops back as NT AUTHORITY\SYSTEM , giving the attacker full control over the domain controller if the service runs there.

The for CVE-2025-41686 and CVE-2016-20033 reflects the ease of exploitation (Low Attack Complexity, Low Privileges Required) and the severe consequences. CVE-2024-51448, with a score of 6.7 (Medium), is less severe because it requires an attacker to already have "High" privileges to exploit it, though it still enables a jump to Administrator.