The article discusses creating a vulnerable lab for testing Server-Side Request Forgery (SSRF) attacks. Here's a summary of key points:
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The author describes setting up a Docker environment with multiple services running on different ports, but only exposing port 3000 externally.
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A vulnerable endpoint is created that accepts an arbitrary URL from the request body and makes a fetch() call to it without any validation or sanitization.
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This allows an attacker to reach internal endpoints like http://localhost:3002/api/carStatus which are not accessible directly from outside Docker.
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The main issue highlighted is lack of proper input validation/sanitization for the URL parameter.
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Two potential mitigation strategies are discussed:
- Client-side and server-side sanitization/validation
- Using a different design pattern that doesn't accept full URLs, but only endpoint names
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A challenge is posed to readers to implement their own filtering mechanism between extracting the URL from the request body and making the fetch call.
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The author invites readers to expand on this lab or create their own vulnerable labs for practice.
The key takeaway is that accepting unvalidated URLs in server-side code can lead to SSRF vulnerabilities, which need
Read the full article at InfoSec Write-ups - Medium
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