Explain about "insecure upload/download" injection defect.

Uploading/downloading files in an insecure manner is a broad type of risk that covers path manipulation, data caching, file handling, malware and anti-virus, access control, and bandwidth concerns.

Path manipulation is a major concern. For this type of injection defect, untrusted data is used to construct the path to the resource. For example:

• Path manipulation for a download may allow unauthorized access to a resource.
• Path manipulation for a upload may allow a file to be placed on an unauthorized location covering up a legitimate resource.
• Path manipulation for an upload may allow an executable file to open up "back-doors".

Mitigation strategies:

• Do not use untrusted data in file paths or names; instead, use server-generated file paths and names.
• Restrict the application's access to its home directory and subdirectories, thereby leveraging the operating system's access controls.
• Normalize the path prior to validation and authorization checks when using untrusted data as part of a file path. Validate the path against a whitelist.

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