$ cd C:\ProgramData\SomeApp\bin
The attacker renames the original executable and moves their malicious payload into its place using the exact same name. Upon the next service invocation, the attacker escalates to NT AUTHORITY\SYSTEM . How to Remediate and Secure NSSM Services
sc config vuln_svc binPath= "C:\evil\shell.exe" sc stop vuln_svc sc start vuln_svc
Implement Windows Defender Application Control (WDAC) or AppLocker to restrict execution of binaries to only those that are signed and trusted. This can prevent execution of malicious binaries even if replacement occurs. nssm-2.24 privilege escalation
NSSM 2.24 is the last "stable" release of the tool (though pre-release 2.25 exists to address bugs). It provides functionality to monitor applications, restart them if they crash, and ensure they start during the boot process. Many commercial products bundle NSSM 2.24 to handle their service management. The NSSM 2.24 Privilege Escalation Mechanism
: If an application uses NSSM to run a service but fails to enclose the path to in quotation marks (e.g., C:\Program Files\App\nssm.exe ), a local attacker can place a malicious file (like C:\Program.exe ) to gain elevated SYSTEM privileges upon a reboot. Insecure Executable Permissions : If the folder containing
The most common ways privilege escalation occurs involving NSSM 2.24 include: 1. Insecure File Permissions This can prevent execution of malicious binaries even
The "nssm-2.24 privilege escalation" typically refers to an insecure configuration rather than a memory corruption bug. The exploit usually follows one of two paths:
When administrators want a standard script, Java application, or Node.js program to run continuously in the background on startup, they often turn to NSSM.
When NSSM 2.24 is used to install a service, it might not properly quote the paths to the executable if those paths contain spaces. Many commercial products bundle NSSM 2
. Because NSSM is an executable used to wrap other applications as services, it is a high-value target for attackers who have already gained a foothold on a system. Primary Escalation Vectors
While nssm.exe itself is a stable and legitimate administration utility, its implementation by third-party software installers and vendors frequently creates vulnerabilities. These flaws fall primarily into two categories: 1. Insecure Permissions on the Binary (Weak DACLs)