Golang Snippet #04

The Code Review Snippet challenges are designed to help you identify vulnerabilities in a small snippet of code. Initially, you are encouraged to find the issue on your own. If you struggle or want to ensure your findings are correct, you can watch the provided video. In this particular lab, we examine a piece of code written in Golang. We begin by analyzing the main function and the auth middleware function, which handles basic authentication. One notable issue is the failure to use TLS, exposing the application to potential tampering or information sniffing.

Further examination reveals a critical vulnerability in the check function. The function incorrectly allows access if either the username or password is correct, rather than requiring both to be correct. This means an attacker could bypass authentication by providing either a valid username or a valid password. Such a flaw could have severe security implications, making it essential to ensure that both conditions must be met for successful authentication.