Server-Side Request Forgery (SSRF) Vulnerability

Server-Side Request Forgery (SSRF) – Explained

May 25, 2022

7 min read

Ivona Simic

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Capitalizing on a server-side request forgery vulnerability, attackers target a vulnerable application’s backend server and coax it to execute malicious requests for performing unintended actions. Through SSRF attacks, hackers can infiltrate other systems connected to the webserver or target internal resources they cannot reach from outside the network. With the changing threat landscape, SSRF is listed in the tenth spot (A10) of the 2021 OWASP top ten vulnerabilities and continues to be considered a major security risk for application-owning organizations.

This article discusses the importance of server-side request forgery attacks, common approaches through which hackers exploit SSRF vulnerabilities, and their prevention techniques.

How to Prevent SSRF Attacks and Its Importance in Security

Inter-server requests are essential for web applications to access remote resources of other applications by importing metadata of the resources from the URLs. If the target URL is built using user-controllable data, a threat actor can change parameter values within the application to craft malicious requests from the backend server. Controlling server-side requests allows hackers to orchestrate a wide range of offensive pursuits on internal networks, thereby causing SSRF prevention a priority concern for organizations. The following section discusses SSRF prevention and its importance in application security. 

Server-Side Request Forgery Prevention

Some standard techniques to prevent server-side request forgery attacks

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