> 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/linux-easy/blocky-hackthebox-writeup.md). # Blocky HackTheBox Writeup Blocky HackTheBox Easy Linux machine writeup covering WordPress Enumeration, Information Leakage, Analyzing a jar file - JD-Gui + SSH Access, Abusing Sudoers Privilege (Privilege Escalation), with pra {% embed url="" %} {% hint style="warning" %} **Skills:** * WordPress Enumeration * Information Leakage * Analyzing a jar file - JD-Gui + SSH Access * Abusing Sudoers Privilege (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 -n -Pn --min-rate 5000 10.10.10.37 -oG allPorts ```

**Analysis of open ports with extractport:** Using the extractport function to synthetically display open ports and copy them to the clipboard. (21.22.80,25565)

**Scanning the port version with Nmap:** Using Nmap to scan the port version and extracting the information into the "targeted" file: ```bash nmap -sCV -p21,22,80,25565 10.10.10.37 -oN targeted ```

### Port 80

**Enumeration of directories with Gobuster:** We use **Gobuster** to enumerate directories on the target machine's web server. ```bash gobuster dir -u http://blocky.htb/ -w /usr/share/SecLists/Discovery/Web-Content/directory-list-2.3-medium.txt -t 100 ```

We discover a directory named **plugins**.

**Downloading and extracting the BlockyCore.jar file:** We download the **BlockyCore.jar** file, which appears to be a custom plugin. Then we extract its contents. ```java jar xf BlockyCore.jar ``` #### Decompiling the BlockyCore.class file In the extracted file we find a **BlockyCore.class** file. We decompile it using **javap** to examine its contents ```bash javap -c BlockyCore.class ``` We find a set of credentials for the database: * **localhost** * **root** * **8YsqfCTnvxAUeduzjNSXe22**

#### Database access via PhpMyAdmin Using the extracted credentials, we log in to **PhpMyAdmin** and discover a table in the database containing a user named **notch**.

**Connection by SSH:** We use the password **`8YsqfCTnvxAUeduzjNSXe22`** for user **notch** and successfully log in.

### Flag User.txt

## Privilege Escalation We notice that the user belongs to the **sudo** group, which allows us to use **sudo** to elevate our privileges

**Running the sudo su command:**/ We run the following command to get a root shell: ```bash sudo su 8YsqfCTnvxAUeduzjNSXe22 ``` ### Flag root.txt : )

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