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  1. Web Security Academy
  2. File upload vulnerabilities
  3. Lab

Lab: Remote code execution via polyglot web shell upload

PRACTITIONER

This lab contains a vulnerable image upload function. Although it checks the contents of the file to verify that it is a genuine image, it is still possible to upload and execute server-side code.

To solve the lab, upload a basic PHP web shell, then use it to exfiltrate the contents of the file /home/carlos/secret. Submit this secret using the button provided in the lab banner.

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