Java Snippet #11

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

PRO
Tier
Easy
< 1 Hr.
752

Course


The Code Review Snippet challenges provide small snippets of vulnerable code, and in this lab, we focus on `Fetcher.java`. The code is designed to fetch content from a specific URL but uses a regular expression to validate the URL. However, the regular expression is flawed because the dots in the domain are not escaped, allowing any character to replace them. As a result, someone could easily bypass the filter by registering a similar domain like `secureApentesterlab.com`.

The lab guides you through the code, explaining each step, from importing libraries to handling exceptions. The primary issue is that the code's regular expression (`Pattern.compile("^https://secure.pentesterlab.com/")`) does not properly escape dots, making it vulnerable. This oversight allows attackers to exploit the regex and potentially access restricted URLs.

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