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HackTheBox/Forge.md
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# HackTheBox-Forge
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## NMAP
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```bash
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PORT STATE SERVICE REASON VERSION
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21/tcp filtered ftp no-response
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22/tcp open ssh syn-ack ttl 63 OpenSSH 8.2p1 Ubuntu 4ubuntu0.3 (Ubuntu Linux; protocol 2.0)
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80/tcp open http syn-ack ttl 63 Apache httpd 2.4.41
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| http-methods:
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|_ Supported Methods: GET HEAD POST OPTIONS
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|_http-server-header: Apache/2.4.41 (Ubuntu)
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|_http-title: Did not follow redirect to http://forge.htb
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Service Info: Host: 10.10.11.111; OS: Linux; CPE: cpe:/o:linux:linux_kernel
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```
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## PORT 80 (HTTP)
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<img src="https://i.imgur.com/gFc4q87.png"/>
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on visting http server , it's going to redirect us to `forge.htb` so let's add this to `/etc/hosts` file
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<img src="https://i.imgur.com/Tozixid.png"/>
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<img src="https://i.imgur.com/AkIQju6.png"/>
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We can try to upload images through this page , but after that there's nothing we can do , we can't upload a php file as it replaces the a random name
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<img src="https://i.imgur.com/K2LrZ2W.png"/>
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<img src="https://i.imgur.com/EJh7bsj.png"/>
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I tried to visit `uploads` directory but it just gives an error
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<img src="https://i.imgur.com/wYjc2wn.png"/>
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We can see `static` directory from where javascript ,css and images are loaded
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<img src="https://i.imgur.com/D08h6S5.png"/>
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I ran `gobuster` to fuzz for files and directories but didn't found anything so went with `wfuzz` to look for any subdomains
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<img src="https://i.imgur.com/pfDT7km.png"/>
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We found `admin.forge.htb` so let's add this to /etc/hosts file
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<img src="https://i.imgur.com/aD1znZ4.png"/>
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so going to `admin.com.forge.htb`
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<img src="https://i.imgur.com/4oHjlXJ.png"/>
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It seems that we can't access this as it's only allowed from localhost , going back to `forge.htb` I missed looking into `upload from url` option
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<img src="https://i.imgur.com/Kh2oP6n.png"/>
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So what if we try to access `admin.forge.htb` through this which is known as a SSRF attack (Server Side Request Foregery) where we make a request from the web application to access internal resources
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<img src="https://i.imgur.com/1mg1571.png"/>
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<img src="https://i.imgur.com/tDbytOp.png"/>
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So it seems there's a wordlist being used here , let's try if we can acesss localhost
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<img src="https://i.imgur.com/J7BWm8P.png"/>
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It gives the same error again so we need to bypass this backlist somehow , for localhost we can try this `http://127.127.127.127` , `http://127.0.1.1` or `http://[::]:80/`
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<img src="https://imgur.com/K2XNCZA.png"/>
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And it uploads the file now we can just wget it and see the response
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<img src="https://imgur.com/lQPXEQX.png"/>
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Perfect , we bypassed making a request to localhost but still have to do something about the admin subdomain so why not try accessing it like this
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`http://admin.Forge.htb` or `http://ADMIN.FORGE.HTB`
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<img src="https://imgur.com/8SOxFLn.png"/>
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Here we can see an `upload` folder again which I assume it's the same one but we have `announcmennts` so let's try to see what's in there
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`http://ADMIN.FORGE.HTB/announcements/`
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<img src="https://imgur.com/D0GXXCR.png"/>
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Here it gives us the ftp creds also it tells us that there's a GET parameter on `/upload` which supports ftp,http or https , so we need to make the request again with the ftp creds to `upload` on `admin.forge.htb` domain
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`http://ADMIN.FORGE.HTB/upload?u=ftp://user:heightofsecurity123!@127.127.127.127`
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<img src="https://i.imgur.com/KzdVwWX.png"/>
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We can grab the `user.txt` if we want but we don't see much here . I went to `snap` folder but it was just a rabitt hole wasn't anything there , so we can try to access `.ssh` folder if it exists we can get the contents there so fingers crossed.
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`http://ADMIN.FORGE.HTB/upload?u=ftp://user:heightofsecurity123!@127.127.127.127/.ssh/`
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<img src="https://i.imgur.com/SrO9iXv.png"/>
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Boom we can get the `id_rsa` key but we don't know the user yet so let's grab` authorized_keys` file too as it contains the username for whom the keys are generated for
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<img src="https://imgur.com/Xodr36h.png"/>
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This key is for `user` so let's try logging in
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<img src="https://imgur.com/InwSVtf.png"/>
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We can do `sudo -l` to see if the user can run commands as sudo
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<img src="https://imgur.com/ohoxvyN.png"/>
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Checking the python , what it's about and it's opening up a TCP port to listen on and we can connect to it using `telnet` which it's going to ask for a password and after that we can run commands like ps -aux , ss -ltp, df
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<img src="https://imgur.com/CBdTZrU.png"/>
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<img src="https://imgur.com/uuMU1c6.png"/>
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If we specify a wrong option other than 1,2,3,4 and `Pdb` prompt is going to show up
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<img src="https://imgur.com/xlEKt2o.png"/>
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So I googled what this Pdb is and it's a python debugger
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<img src="https://imgur.com/NlyS0yI.png"/>
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Being a debugger we can try to run some python commands through it
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<img src="https://imgur.com/hAAqsQb.png"/>
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<img src="https://imgur.com/Q3WJXbb.png"/>
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With this we rooted this box
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## References
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- https://github.com/swisskyrepo/PayloadsAllTheThings/blob/master/Server%20Side%20Request%20Forgery/README.md
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- https://docs.python.org/3/library/pdb.html
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