The .php concatenation might break some wrappers, but advanced payloads or null byte injection ( %00 ) can bypass this. Alternatively, if the application uses functions like file_get_contents() or readfile() without suffix addition, the wrapper works directly. You might ask: why not just read the file as plaintext? Because the file typically contains newlines, special characters, and PHP might parse or corrupt binary data. Base64 encoding ensures a clean, readable string that can be copied and decoded offline.
Understanding how to decode, exploit (ethically), and defend against this attack is crucial for modern web security. The exploitation is trivial if LFI exists, but the is also straightforward: sanitize user input, disable unsafe wrappers, remove credentials from disk, and adopt IAM roles. The exploitation is trivial if LFI exists, but
Example output when the attack succeeds: disable unsafe wrappers