The two-factor authentication system is crucial for protecting user data, requiring not just a username and password but also additional verification.
Nevertheless, vulnerabilities such as ‘Improper Authentication’ can occur when single-use and time-limited One-Time Passwords (OTPs) can be reused beyond their expiration, creating risks.
This article explores this vulnerability in depth, including its causes and impacts, and offers a step-by-step guide to its detection, which ethical hacking tools are useful, and best practices for detection.
It also examines a real-world example of this issue as reported on HackerOne in June 2024, highlighting the flaw in HackerOne’s own platform and underscoring the necessity of diligent security research.
The piece aims to give a thorough understanding of this vulnerability, its effects, and how to reduce it.