LESSON 58: File Upload Vulnerabilities Explained (DVWA) | Web Shell & RCE Demo

In this lesson, we exploit File Upload vulnerabilities in DVWA to upload malicious PHP web shells and gain remote code execution on the server. File upload flaws are among the most dangerous web vulnerabilities, allowing attackers to upload backdoors, execute system commands, and completely compromise servers.

We demonstrate how to create simple and advanced PHP web shells, upload them to vulnerable applications, and use them to execute operating system commands remotely through the browser.

File Upload vulnerabilities occur when web applications accept file uploads without properly validating file type, content, or destination, allowing attackers to upload executable code disguised as legitimate files.

WEB SHELLS CREATED:

Simple PHP Shell (shell.php)

Advanced Web Shell with UI (webshell.php):
Full HTML form interface for command execution with formatted output

COMMANDS EXECUTED VIA UPLOADED SHELL:
- http://localhost/DVWA/hackable/uploads/shell.php?cmd=whoami
- http://localhost/DVWA/hackable/uploads/shell.php?cmd=ls
- http://localhost/DVWA/hackable/uploads/shell.php?cmd=pwd
- http://localhost/DVWA/hackable/uploads/shell.php?cmd=cat /etc/passwd
- http://localhost/DVWA/hackable/uploads/shell.php?cmd=uname -a

ATTACK FLOW:
1. Create malicious PHP shell file
2. Upload to vulnerable application
3. Access uploaded file via browser
4. Execute system commands through URL parameters
5. Gain full remote code execution

SETUP REQUIRED:
- DVWA at http://localhost/DVWA - login: admin/password
- Security level: Low
- Navigate to File Upload
- Text editor - nano, vim, or any editor

📝 ASSIGNMENT:
1. Create simple PHP shell
2. Upload shell.php to DVWA
3. Execute 5+ commands via uploaded shell
4. Create advanced web shell with HTML form
5. Upload and test advanced shell
6. Screenshot command execution results
7. Document upload directory path
8. Bonus: Try double extension - shell.php.jpg

🌐 JOIN OUR COMMUNITY:
https://t.me/+dvi_feSCRCJmNjJk
Share screenshots, ask questions, help fellow students!

❓ CHALLENGE QUESTION:
Explain the complete attack chain for exploiting file upload vulnerabilities. How would an attacker go from uploading a simple shell to establishing persistent access with a backdoor? What commands would they use? How can organizations prevent file upload attacks in their web applications?

Drop your answer in the comments! If you successfully uploaded a web shell and executed commands, comment "FILE UPLOAD HACKER!"

#dvwa
#remocodeexecution
#cybersecurity
#ethicalhacking
#fileupload
#webshell
#rce
#websecurity
#kalilinux
#dvwa
#penetrationtesting

Видео LESSON 58: File Upload Vulnerabilities Explained (DVWA) | Web Shell & RCE Demo канала Victor Akinode