Lab: Blind SSRF with Shellshock exploitation
Summary: PortSwigger's lab asks the solver to exploit analytics software that fetches the URL in the Referer header, using it to perform a blind SSRF attack against an internal server in the 192.168.0.X range on port 8080. The blind attack uses a Shellshock payload against that internal server to exfiltrate the name of the OS user, with a Burp Collaborator payload placed inside the Shellshock string and the platform's firewall blocking interactions with arbitrary external systems.
What you should know: A routine analytics feature that fetches the Referer URL is enough to reach an internal host on port 8080, and a Shellshock payload there turns that reach into disclosure of the OS user - a reminder that outbound fetches from product pages are an attack path into networks assumed to be unreachable.
Read the original at PortSwigger Research ↗
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