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The attacker inputs ?page=file-3A-2F-2F-2F-2Fetc-2Fpasswd .
When reassembled correctly by a decoder tool like URLDecoder , the system evaluates this expression as file:/// , which is the base root prefix for local directory mapping. Why "fetch-url-file:/// " Causes Serious Application Errors fetch-url-file-3A-2F-2F-2F
When fetching URL files, keep the following best practices in mind: The attacker inputs