fuzzdb/attack/file-upload/README.md

File Upload Fuzzfiles- File Name Filter Bypass Notes

see: http://cwe.mitre.org/data/definitions/434.html

kinds of file upload verifications:

content-type

filename extension verificationi (whitelist, blacklist)

file content checking

client side, ha ha ha

File notes:

alt-extensions-asp.fuzz.txt alt-extensions-coldfusion.fuzz.txt alt-extensions-jsp.fuzz.txt alt-extensions-perl.fuzz.txt alt-extensions-php.fuzz.txt

Alternative ways of expressing file extensions that will be interpreted correctly by the target filesystem/app and can be used to bypass blacklist filters

file-ul-filter-bypass-commonly-writable-directories.fuzz.txt

File directory names that experience has shown are often writable

file-ul-filter-bypass-microsoft-asp-filetype-bf.fuzz.txt

{ASPSCRIPT}gets regex replaced with the shell or other file you are trying to upload, {EXT} should be brute-forced with payloads from discovery/filename-bruteforce/file-extensions/, since some file upload types may be allowed that are not listed.

file-ul-filter-bypass-microsoft-asp.fuzz.txt

this file contains a number of common predictable values. Add more if other file types are allowed, or use the filetype-bf version of this fuzzfile - {ASPSCRIPT} gets regex replaced.

file-ul-filter-bypass-ms-php.fuzz.txt file-ul-filter-bypass-x-platform-php.fuzz.txt

php on microsoft, cross-platform. use both on ms.

Use exiftool http://www.sno.phy.queensu.ca/~phil/exiftool/ to create a .jpg image with the meta comment field set to:

-----

# #-----

then regex replace {PHPSCRIPT} with the name of your .jpg file in the target directory

invalid-filenames-microsoft.fuzz.txt

Useful for causing error messages that contain an absolute drivepath, such as if you don't know where the file uploader puts files

regex replace {EXT} with allowed extension type

file-ul-filter-bypass-x-platform-generic.fuzz.txt

These might bypass a file upload blacklist but be written in a way that leaves them executable because of the filetype

regex replace {PHPSCRIPT} with your script name

invalid-filenames-linux.fuzz.txt

invalid filenames under linux, and since there aren't too many of those, other filepaths that may cause problems. # these can be used to attempt to cause an error condition during file upload bypass attempts which might reveal an absolute path. Useful if you're not sure where your files are landing.

invalid-filesystem-chars-microsoft.fuzz.txt

list of invalid characters for windows filesystem - these can be used to attempt to cause an error condition during file upload bypass attempts which might reveal an absolute path. Useful if you're not sure where your files are landing.

fuzz these into a filename during upload attempts

Addtl Tips:

For mod_cgi Server Side Include upload attacks:

or, on Windows

Sometimes you can overwrite .htaccess in an upload folder on Apache httpd, if so,

try setting jpg mimetype handler to executable. If you can set the target directory, try to fuzz the

list of all dirs you've enumerated on the servers, and try the commonly writable directory fuzzfile.

example .htaccess entry that sets mime type .jpg to be executable:

---

AddType application/x-httpd-php .jpg