Lab: Blind SQL injection with out-of-band interaction
Summary: This PortSwigger lab contains a blind SQL injection vulnerability in the TrackingId cookie, which the application passes into a SQL query that runs asynchronously and has no effect on the response. To solve it, participants modify the cookie with a payload that triggers a DNS lookup to Burp Collaborator's default public server, since the Academy firewall blocks interactions with arbitrary external systems.
Bottom line: The lab's query produces no visible response, so the only confirmation of exploitation is an out-of-band DNS lookup - the same channel an attacker would use to exfiltrate sensitive data from a real application.
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