Express Local File Read

This exercise covers how an insecure to render can be used to gain local file read with Express

PRO
Tier
Medium
< 1 Hr.
325
Brown Badge

Course


This course delves into a specific vulnerability in ExpressJS, stemming from the improper use of the `render` method on user-supplied data. The course outlines the problem and demonstrates how an attacker can exploit this flaw to perform local file read (LFR) attacks. By following the provided code snippets and examples, you will understand how the misuse of the `render` function can lead to severe security issues.

The video transcript further elucidates the practical steps of exploiting this vulnerability. You will see how to manipulate the parameters to read sensitive files from the server. The course concludes with a reminder to always validate the format of parameters in web applications to prevent such vulnerabilities.

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