In this case, an attacker could potentially upload a server-side code file that functions as a web shell, effectively granting them full control over the server. In the worst case scenario, the file's type isn't validated properly, and the server configuration allows certain types of file (such as. What restrictions are imposed on the file once it has been successfully uploaded. Which aspect of the file the website fails to validate properly, whether that be its size, type, contents, and so on. The impact of file upload vulnerabilities generally depends on two key factors: What is the impact of file upload vulnerabilities? Other attacks may involve a follow-up HTTP request for the file, typically to trigger its execution by the server. In some cases, the act of uploading the file is in itself enough to cause damage. This could even include server-side script files that enable remote code execution. Failing to properly enforce restrictions on these could mean that even a basic image upload function can be used to upload arbitrary and potentially dangerous files instead.

View all file upload labs What are file upload vulnerabilities?įile upload vulnerabilities are when a web server allows users to upload files to its filesystem without sufficiently validating things like their name, type, contents, or size. If you're already familiar with the basic concepts behind file upload vulnerabilities and just want to get practicing, you can access all of the labs in this topic from the link below.

Php exiftool exploit