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The first level of protection that comes to mind is Input validation.īased on that point, the following question comes to mind: How to perform this input validation?Īs Orange Tsai shows in his talk, depending on the programming language used, parsers can be abused.
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To apply the defense in depth principle, both layers will be hardened against such attacks. Several protective measures are possible at the Application and Network layers. It can be stated that the required calls will only be targeted between those identified and trusted applications. The allow list approach is a viable option since the internal application called by the VulnerableApplication is clearly identified in the technical/business flow. The user leverages the web application as a proxy to the HR system. By design, that web application will have to communicate using a protocol that the HR system understands to process that data.īasically, the user cannot reach the HR system directly, but, if the web application in charge of receiving user information is vulnerable to SSRF, the user can leverage it to access the HR system. to create a profile in an internal HR system. Take the example of a web application that receives and uses personal information from a user, such as their first name, last name, birth date etc. Depending on the business case, user input is required for the functionality to work. Sometimes, an application needs to perform a request to another application, often located on another network, to perform a specific task. Case 1 - Application can send request only to identified and trusted applications ¶ Application can send requests to ANY external IP address or domain name: Case when allow listing approach is unavailable.īecause these two cases are very different, this cheat sheet will describe defences against them separately.Application can send request only to identified and trusted applications: Case when allow listing approach is available.If the application is vulnerable to XML eXternal Entity (XXE) injection then it can be exploited to perform a SSRF attack, take a look at the XXE cheat sheet to learn how to prevent the exposure to XXE.ĭepending on the application's functionality and requirements, there are two basic cases in which SSRF can happen:.Generally, the first request is HTTP, but in cases where the application itself performs the second request, it could use different protocols ( e.g. SSRF is not limited to the HTTP protocol.
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Most of the times, user data is sent along to be processed, and if poorly handled, can perform specific injection attacks. Internal requests to interact with another service to serve a specific functionality.Custom WebHook (users have to specify Webhook handlers or Callback URLs).
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user enters image URL of their avatar for the application to download and use). One of the enablers for this vector is the mishandling of URLs, as showcased in the following examples: SSRF is an attack vector that abuses an application to interact with the internal/external network or the machine itself. This talk from the security researcher Orange Tsai as well as this document provide techniques on how to perform this kind of attack. This cheat sheet will focus on the defensive point of view and will not explain how to perform this attack. The objective of the cheat sheet is to provide advices regarding the protection against Server Side Request Forgery (SSRF) attack. Server-Side Request Forgery Prevention Cheat Sheet ¶ Introduction ¶ Insecure Direct Object Reference PreventionĬase 1 - Application can send request only to identified and trusted applicationsĬase 2 - Application can send requests to ANY external IP address or domain nameĬhallenges in blocking URLs at application layer
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