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CVE-2020-5398 is a reflected file download vulnerability in Spring Framework. Spring MVC or Spring WebFlux applications are affected when they construct a response Content-Disposition header whose filename parameter is derived from user-controlled request input. Insufficiently safe handling of untrusted filename content can enable an attacker to craft a response that is used in a reflected file download attack.
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1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos.
This repository is a proof-of-concept (PoC) exploit for CVE-2020-5398, a Reflected File Download (RFD) vulnerability in Spring Framework's Web MVC component. The repository is structured as a simple Spring Boot application with a single controller (MainController.java) that exposes a GET endpoint at '/'. This endpoint takes two parameters: 'filename' and 'contents'. It sets the Content-Disposition header in the HTTP response using the user-supplied filename, appending '.txt', and returns the supplied contents as the file body. The PoC demonstrates how, in vulnerable versions of Spring (prior to 5.2.3), improper handling of the filename parameter can allow an attacker to craft a response that causes the victim's browser to download a file with an arbitrary extension and content, potentially leading to further exploitation if the file is executed. The repository includes build files for Gradle, a README with usage instructions and references, and minimal test scaffolding. The main exploit capability is to demonstrate and test the RFD vulnerability by simulating attacker-supplied input that manipulates the file download process.
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