- Visit a product, click "Check stock", intercept the request in Burp Suite, and send it to Burp Repeater.
-
Change the URL in the
stockApiparameter tohttp://127.0.0.1/and observe that the application is parsing the URL, extracting the hostname, and validating it against a whitelist. -
Change the URL to
http://username@stock.weliketoshop.net/and observe that this is accepted, indicating that the URL parser supports embedded credentials. -
Append a
#to the username and observe that the URL is now rejected. -
Double-URL encode the
#to%2523and observe the extremely suspicious "Internal Server Error" response, indicating that the server may have attempted to connect to "username". -
To access the admin interface and delete the target user, change the URL to:
http://localhost:80%2523@stock.weliketoshop.net/admin/delete?username=carlos
Lab: SSRF with whitelist-based input filter
This lab has a stock check feature which fetches data from an internal system.
To solve the lab, change the stock check URL to access the admin interface at http://localhost/admin and delete the user carlos.
The developer has deployed an anti-SSRF defense you will need to bypass.
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