File Thingie v2.5.5 File Security Bypass
There are security controls in place that attempt to prevent users from uploading PHP files and also renaming them to PHP extensions. However advanced security controls do not exist that would prevent a user from uploading a text file containing PHP code. An attacker can exploit a weakness in the file rename process allowing the attacker to rename a text file (containing code) to a .php extension and execute the script. This exploit demonstrates a way to backdoor File Thingie by uploading an *.inc file that contains a backdoored copy of File Thingie, then uploading a *.txt file containing some PHP code that will overwrite ft2.php to execute the backdoored copy of File Thingie. But first the *.txt file has to be renamed to a *.php and then executed in the browser.
