Barbhack 2025 CTF
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Members of the NetExec team created a small lab as a CTF for the Barbhack conference that took place in August 2025 in the South of France. There are four Windows servers on an Active Directory domain. I’ll find a leaked password on a printer webpage to get access to print jobs where I find initial passwords, some of which still work. I’ll use that to get into the domain, coercing an authentication that I can relay into RBCD to get a ticket at admin on the webserver. I’ll decrypt a saved password on that machine to get access to a new SMB share where I’ll find a GMSA credential in a file. That user can abuse impersonation in the MSSQL database to become sa, where I’ll abuse SeImpersonatePrivilege to get SYSTEM on the DB server. That server has constrained delegation over another, whi…

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