Race Condition Hackviser ((full)) -

When a user uploads a file, some applications temporarily save it to a public directory before validating its extension and deleting it if it is malicious. An attacker can exploit this window by uploading a web shell (like a .php file) and immediately requesting that file via a concurrent script before the application has time to delete it. How to Test for Race Conditions

A race condition occurs when two or more code paths access shared resources at the same time. If the application fails to safely lock or isolate those resources, a tiny opens up. Within this window, the application’s state becomes temporary or inconsistent, allowing security checks to be subverted.

Since the binary is , it writes with root privileges. Congratulations—you just overwrote /etc/passwd or added an SSH key for root.

Change the sending options to . This leverages HTTP/2 multiplexing to ensure the server receives all requests simultaneously, stripping away network latency variables.

For blue teams, we propose: