Business CTF 2023 - Finding Logic Bugs in Your Code by 21y4d
Source: YouTube · Hack The Box · published Jul 13, 2023 · 18:31
This presentation defines logic bugs as unintended application flows caused by user input and demonstrates a specific vulnerability type—validation logic disparity—using an exam booking system, highlighting the gap between frontend and backend validation.
Key Takeaways:
• Logic bugs are difficult for automated tools to identify because they require a deep understanding of the code's context and logic design 0:27-1:05.
• Validation logic disparity occurs when the front-end accepts inputs while the back-end fails to revalidate, creating security holes like booking an exam date that is technically unavailable or in the wrong range 7:00-7:13.
• By manipulating API requests directly, specifically changing the exam ID and date parameters, an attacker can bypass frontend restrictions and successfully book non-existent slots 15:45-16:17.
Thorough validation on both frontend and backend is essential to prevent security gaps and protect against potential financial and data breaches.
Sources:
- 0:27-1:05 Definition of logic bugs and why tools struggle with them
- 1:45-2:03 Potential impacts from inconvenience to remote code execution
- 7:00-7:13 Validation logic disparity explanation
- 15:45-16:17 API request manipulation example
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Transcript Preview
First 800 characters of the transcript
good day everyone I hope all of you are having a good time at our hack the Box 2023 business CTF talks and today I will be talking about finding logic bugs in your code now this will be part of our upcoming secure coding module titled application logic flows and which is a module due to be released soon and this module will be all about logic bugs and logic flows and so let's start by discussing what logic bugs are so what are logic bugs logic bugs are unintended flows in the logic design of any application whether it's a web application or a mobile application or any other kind of application when it handles user input or any other kind of input it may behave in a way that is unwanted or unintended and it may lead to several kind of behaviors that leads to bad impact that we want to avoid…