Web Shell Upload via Race Condition
👩🎓👨🎓 Learn about File Upload vulnerabilities and how to exploit them! This lab contains a vulnerable image upload function. Although it performs robust validation on any files that are uploaded, it is possible to bypass this validation entirely by exploiting a race condition in the way it processes them. To solve the lab, we need to upload a basic PHP web shell, then use it to exfiltrate the contents of the file /home/carlos/secret.
Overview:
0:00 Intro
0:26 Recap: file upload vulnerabilities
2:00 Exploiting file upload race conditions
3:07 Lab: Web shell upload via race condition
4:02 Explore profile image upload functionality
6:12 Leverage race condition for RCE
9:14 Conclusion
If you're struggling with the concepts covered in this lab, please review https://blog.intigriti.com/hackademy/... and https://portswigger.net/web-security/... 🧠
🔗 @PortSwiggerTV challenge: https://portswigger.net/web-security/...
🧑💻 Sign up and start hacking right now - https://go.intigriti.com/register
👾 Join our Discord - https://go.intigriti.com/discord
🎙️ This show is hosted by / _cryptocat ( @_CryptoCat ) & / intigriti
👕 Do you want some Intigriti Swag? Check out https://swag.intigriti.com