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HackTheBox/Paper.md
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HackTheBox/Paper.md
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# HackTheBox-Paper
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## NMAP
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```bash
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PORT STATE SERVICE VERSION
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22/tcp open ssh OpenSSH 8.0 (protocol 2.0)
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| ssh-hostkey:
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| 2048 10:05:ea:50:56:a6:00:cb:1c:9c:93:df:5f:83:e0:64 (RSA)
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| 256 58:8c:82:1c:c6:63:2a:83:87:5c:2f:2b:4f:4d:c3:79 (ECDSA)
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|_ 256 31:78:af:d1:3b:c4:2e:9d:60:4e:eb:5d:03:ec:a0:22 (ED25519)
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80/tcp open http Apache httpd 2.4.37 ((centos) OpenSSL/1.1.1k mod_fcgid/2.3.9)
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|_http-generator: HTML Tidy for HTML5 for Linux version 5.7.28
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| http-methods:
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| Supported Methods: POST OPTIONS HEAD GET TRACE
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|_ Potentially risky methods: TRACE
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|_http-title: HTTP Server Test Page powered by CentOS
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443/tcp open ssl/http Apache httpd 2.4.37 ((centos) OpenSSL/1.1.1k mod_fcgid/2.3.9)
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| http-methods:
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|_ Supported Methods: GET
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| ssl-cert: Subject: commonName=localhost.localdomain/organizationName=Unspecified/countryName=US
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| Subject Alternative Name: DNS:localhost.localdomain
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| Issuer: commonName=localhost.localdomain/organizationName=Unspecified/countryName=US
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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: 2021-07-03T08:52:34
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| Not valid after: 2022-07-08T10:32:34
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| MD5: 579a 92bd 803c ac47 d49c 5add e44e 4f84
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|_SHA-1: 61a2 301f 9e5c 2603 a643 00b5 e5da 5fd5 c175 f3a9
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| tls-alpn:
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|_ http/1.1
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```
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## PORT 80/443 (HTTP/HTTPS)
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<img src="https://i.imgur.com/NcYV9NX.png"/>
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On web service we see a default web page which tells that it's using centos, running `dirsearch` to fuzz for files and directories it only finds `manaul` and `cgi-bin`
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<img src="https://i.imgur.com/byjRFT7.png"/>
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And `cgi-bin` doesn't show anything there
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<img src="https://i.imgur.com/Ag0s8lj.png"/>
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So checking the response headers we see a domain `office.paper` , so we'll need to add this domain in `hosts` file
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<img src="https://i.imgur.com/3iwpbmp.png"/>
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<img src="https://i.imgur.com/nQ6lSlY.png"/>
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Now accessing the domain we see a web page which is using wordpress (from the output of wappalyzer extensions)
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<img src="https://i.imgur.com/bs33AIG.png"/>
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<img src="https://i.imgur.com/zD2T5a7.png"/>
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Checking the blog post we find some usernames
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<img src="https://i.imgur.com/O2bDRPc.jpg"/>
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To enumerate wordpress further for users and plugins we can use `wpscan`
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<img src="https://i.imgur.com/Mix5SBU.png"/>
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<img src="https://i.imgur.com/trO6RLt.png"/>
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Searching for vulns for this wordpress version there was
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https://www.exploit-db.com/exploits/47690
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<img src="https://i.imgur.com/ob2XweX.png"/>
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So just by adding `?static=1` to the url would reveal the draft to us
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<img src="https://i.imgur.com/sjdN8aG.jpg"/>
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We get a subdomain with a link to register so add this subdomain in hosts file
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`http://chat.office.paper/register/8qozr226AhkCHZdyY`
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<img src="https://i.imgur.com/oWKficA.png"/>
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Here I tried to register an account
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<img src="https://i.imgur.com/upGkoKt.png"/>
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After creating an account we can read the chat and see that there's a bot that can allow us to perform local file read
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<img src="https://i.imgur.com/wrbXzSx.png"/>
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Since this chat is read only we can directly send command to bot that can read files
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<img src="https://i.imgur.com/ycQFmMd.png"/>
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This gives an error about cat command so it's actually possible to do that
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<img src="https://i.imgur.com/G3O6Rtf.png"/>
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## Foothold
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Interestingly we can also list files in the directory using `list` command and this way we can see the source code of the bot
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<img src="https://i.imgur.com/bVFIBFP.png"/>
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Listing contenst of `hubot` we see a `scripts` folder
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<img src="https://i.imgur.com/AuvHBF1.png"/>
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<img src="https://i.imgur.com/RsmSRPu.png"/>
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There's a script `run.js` so this must be the source of this bot so taking a look at it would reveal that we can also run shell commands through `run`
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<img src="https://i.imgur.com/HO2wBUS.png"/>
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<img src="https://i.imgur.com/j0llnRr.png"/>
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So let's just get a reverse shell from here , but this was an issue when I was trying to get a reverse shell as it was just getting hanged
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<img src="https://i.imgur.com/KWJbJqL.png"/>
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Instead we can just add our ssh key in `authorized_keys` file
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<img src="https://i.imgur.com/HpdXa6u.png"/>
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We can confirm that the contents are written to authorized_keys file by listing `..ssh` directory
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<img src="https://i.imgur.com/Ff7HFFH.png"/>
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<img src="https://i.imgur.com/C7stgAG.png"/>
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## Privilege Escalation
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Now privesc in the box was the easier I have ever seen in a HTB machine , we can see as script named `pk.sh `, that was exploiting `polkit` and creating a new user named `hacked` with the password `password` , adding that user to sudoers file
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<img src="https://i.imgur.com/qwaNn0U.png"/>
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So running the script
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<img src="https://i.imgur.com/gWThbsw.png"/>
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<img src="https://i.imgur.com/hAtEsa5.png"/>
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## References
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- https://www.exploit-db.com/exploits/47690
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- https://0day.work/proof-of-concept-for-wordpress-5-2-3-viewing-unauthenticated-posts/
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