Spring官宣承认网传大漏洞，并提供解决方案

@ControllerAdvice
@Order(Ordered.LOWEST_PRECEDENCE)
public class BinderControllerAdvice {

    @InitBinder
    public void setAllowedFields(WebDataBinder dataBinder) {
         String[] denylist = new String[]{"class.*", "Class.*", "*.class.*", "*.Class.*"};
         dataBinder.setDisallowedFields(denylist);
    }

}

@SpringBootApplication
public class MyApp {

	public static void main(String[] args) {
		SpringApplication.run(CarApp.class, args);
	}


	@Bean
	public WebMvcRegistrations mvcRegistrations() {
		return new WebMvcRegistrations() {
			@Override
			public RequestMappingHandlerAdapter getRequestMappingHandlerAdapter() {
				return new ExtendedRequestMappingHandlerAdapter();
			}
		};
	}


	private static class ExtendedRequestMappingHandlerAdapter extends RequestMappingHandlerAdapter {

		@Override
		protected InitBinderDataBinderFactory createDataBinderFactory(List<InvocableHandlerMethod> methods) {

			return new ServletRequestDataBinderFactory(methods, getWebBindingInitializer()) {

				@Override
				protected ServletRequestDataBinder createBinderInstance(
						Object target, String name, NativeWebRequest request) throws Exception {
					
					ServletRequestDataBinder binder = super.createBinderInstance(target, name, request);
					String[] fields = binder.getDisallowedFields();
					List<String> fieldList = new ArrayList<>(fields != null ? Arrays.asList(fields) : Collections.emptyList());
					fieldList.addAll(Arrays.asList("class.*", "Class.*", "*.class.*", "*.Class.*"));
					binder.setDisallowedFields(fieldList.toArray(new String[] {}));
					return binder;
				}
			};
		}
	}
}