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Request Forgery: Server Side Request Forgery

Identifier: ssrf

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Description

Important note: to ensure this test works, you need the ssrf.tools.escape.tech domain to be allowed in your WAF/Firewall egress rules.

This is so that Escape can get a ping back from your application server.

Server Side Request Forgery happens when an application blindly sends a request to a URL provided by a user. Without proper checks, attackers can supply a URL that directs the request to an internal service or a restricted resource, helping them bypass security boundaries like firewalls or VPN protections.

This oversight can let attackers expose sensitive internal systems or data, and might even be used as a stepping stone for more intrusive attacks. Developers often face this risk when they dont implement strict input validation and proper URL filtering, making it a small mistake with serious potential impact if left unaddressed.

Execution conditions (BLST):

  • Static SSRF checks are run first.
  • Active SSRF fuzzing then runs when this test is enabled, arguments are present, and coverage is not SERVER_UNREACHABLE, TIMEOUT, RATE_LIMIT, UNAUTHORIZED, REDIRECTION, or GENERIC_ERROR.

Configuration

Example

Example configuration:

---
security_tests:
  ssrf:
    skip: false

Reference

skip

Type : boolean

Skip the test if true.