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Just rename the malicious file extension. The same thing goes for the reverse shells not in php but in asp, jsp, perl, etc …. , and so on combining all these possibilities just mentioned. php%0a, Php (php using upper and lower case), add another level of extension like. Other attempts you can do, if for example the upload of. jpg files are accepted, rename malicious file from reverse_shell.php to reverse_ or reverse_shell.jpg. After that, just change the extension of the malicious file.Įxample, if. First we need to see what types of files can be uploaded. In this case, bypassing this filter is easy.

A simple filter that can be applied is the one related to checking only the file extension that can be uploaded or the extensions that cannot be uploaded.

Exiftool command line function