Uploading files bypassing posture

Limit the upload file name extension

Webshell file Upload Vulnerability Analysis traceability (question 1th)

Learn about PHP and PHP5 versions, learn how PHP uploads bypass extensions, and understand how burpsuite is used.

JS Limit upload file format

Webshell file Upload Vulnerability Analysis Traceability (question 2nd)

Master the browser's disabling method of JavaScript, master the method of modifying the data when the form data is submitted through post; understand what Webshell is and what it does; understand JavaScript basic syntax; Learn about javascript validation of file extensions Understand how the PHP program's Webshell script executes.

Restricting file content

Webshell file Upload Vulnerability Analysis Traceability (question 3rd)

Master the file header content of common picture types, master the method of data modification when data is submitted by post, understand what Webshell is and how it works; Learn how PHP Webshell scripts are executed.

Restricting file type MIME

Webshell file Upload Vulnerability Analysis Traceability (question 4th)

Knowledge of upload vulnerability and proficiency in uploading vulnerabilities, understanding Content-type in HTTP request packets, Understanding file Type "MIME", and understanding how burpsuite is used.

Uploading files bypassing posture