Golang Snippet #01

This challenge covers the review of a snippet of code written in Golang

PRO
Tier
Easy
< 1 Hr.
985

Course


The Code Review Snippet challenge for Golang 01 examines a function called `uploadFile`, which handles file uploads in an HTTP request. The video walks you through the code, explaining each step and highlighting a critical vulnerability. The vulnerability lies in trusting the value of `handler.Filename`, which can be exploited for directory traversal attacks, allowing files to be written outside the intended `/tmp` directory.

Despite a patch in May 2021 that mitigates this issue in recent versions of Golang by calling `basename` on `handler.Filename`, understanding this pattern is crucial. Always ensure your code does not blindly trust filenames provided by the browser, as they can be tampered with to include malicious directory paths.

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