Vulnerability Fixation
Server-Side Request Forgery SSRF Vulnerabilities

Server-Side Request Forgery (SSRF)

Server-Side Request Forgery (SSRF) is a type of vulnerability that allows an attacker to manipulate a server to make requests to an internal or external resource on behalf of the server itself. Essentially, this occurs when the server fetches a remote resource or data without properly validating the user-supplied URL.

To prevent SSRF attacks, always validate and sanitize user-supplied URLs by enforcing allowlists for trusted domains and blocking access to internal IP ranges. Additionally, disable unnecessary URL fetch features, use network segmentation, and monitor outbound requests to detect suspicious server behavior.

Attack

  • Attackers craft malicious URLs and trick the server into requesting internal or restricted resources (like localhost or internal APIs).
  • Since the request originates from the server, it can bypass firewalls and access sensitive data.
Impact

  • Unauthorized access to internal systems or cloud metadata.
  • Bypass of firewalls or network restrictions.
  • Denial of Service (DoS) by flooding internal services.
Solution

  • Validate and sanitize URLs allow only trusted domains.
  • Block internal IP ranges (e.g., 127.0.0.1, 10.x.x.x).
  • Use firewalls or proxies to filter outbound requests.
  • Segment internal networks to limit exposure.

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