How to Bypass File Upload Filters with a PHP Shell ✅️

[morix]

Hi, yyou have a place to upload files that you can access, but there is a filter making sure that the
file type matches the ones expected (e.g. only image file types)

PNG Image Header
89 50 4E 47

Open a hex editor and create a new file, copy those bytes over to the beginning of the new file. Into the
TEXT area (on the right, not the bytes area where you just pasted the header above) paste your shell
 

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It should look like this



Take note of the length



Next start burp and navigate to the upload directory.

Then do the following

1. Turn on interceptor

2. Send an upload request with any file

3. Modify the request

 

Original

 

Modified

You can automate this request by doing the following

 

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[moneyHF]

This is changing magic bytes right? Quite common public method tho.