The Hidden Clock: Exploiting Race Conditions on Hackviser In the world of web security, timing isn't just everything—it’s the only thing. While common vulnerabilities like SQL injection are often reliable, are the elusive ghosts of the application world, depending on the millisecond-perfect overlap of concurrent events.
We need two parallel processes:
To understand how to exploit these on Hackviser labs, you have to look at the "window of vulnerability." This is the tiny gap of time between a security check and the actual operation. race condition hackviser
If an attacker sends 50 identical requests in the millisecond before Step 2 completes for the first request, the server may "check" all 50 and find them all valid because the "used" mark hasn't been written to the database yet. This results in the discount being applied 50 times instead of once. Practical Exploitation in Web Security The Hidden Clock: Exploiting Race Conditions on Hackviser