Nssm-2.24 - Privilege Escalation

NSSSM (Non-Sucking Service Manager) is a service manager for Windows that allows users to easily install, configure, and manage system services. NSSM is often used as an alternative to the built-in Windows Service Manager. A vulnerability was discovered in NSSM version 2.24 that allows for privilege escalation.

The vulnerability exists due to improper handling of service configuration files. NSSM uses a configuration file to store service settings, and these files are stored in a directory that is writable by the SYSTEM user. When a user with limited privileges attempts to start a service using NSSM, the service manager will attempt to read and write to the configuration file. nssm-2.24 privilege escalation

import os import sys

# Malicious configuration file path malicious_config_file = os.path.join(config_dir, ' malicious_config.txt') NSSSM (Non-Sucking Service Manager) is a service manager

An attacker can exploit this vulnerability by creating a malicious configuration file with elevated privileges. When a user with limited privileges attempts to start a service using NSSM, the service manager will execute the malicious configuration file, allowing the attacker to gain elevated privileges. The vulnerability exists due to improper handling of

# NSSM configuration directory config_dir = 'C:\\Path\\To\\NSSM\\config'

# Set the configuration file path in the NSSM service configuration nssm_command = f'nssm set service_name config {malicious_config_file}' os.system(nssm_command)