fix: SpringBoot4 WebFlux Base64Utils not found

vul/vul-springboot4-webflux/Dockerfile

@@ -0,0 +1,8 @@
+FROM eclipse-temurin:17.0.17_10-jdk
+WORKDIR /app
+
+COPY build/libs/vul-springboot4-webflux.jar /app/app.jar
+
+EXPOSE 8080
+
+ENTRYPOINT java $JAVA_OPTS -jar app.jar

vul/vul-springboot4-webflux/build.gradle.kts

@@ -0,0 +1,15 @@
+plugins {
+    id("java")
+    id("org.springframework.boot") version "4.0.8"
+    id("io.spring.dependency-management") version "1.1.7"
+}
+
+java {
+    toolchain {
+        languageVersion = JavaLanguageVersion.of(17)
+    }
+}
+
+dependencies {
+    implementation("org.springframework.boot:spring-boot-starter-webflux")
+}

vul/vul-springboot4-webflux/src/main/java/com/reajason/javaweb/vul/springboot4/ClassDefiner.java

@@ -0,0 +1,14 @@
+package com.reajason.javaweb.vul.springboot4;
+
+public class ClassDefiner extends ClassLoader {
+    public ClassDefiner() {
+    }
+
+    public ClassDefiner(ClassLoader parent) {
+        super(parent);
+    }
+
+    public Class<?> defineClass(byte[] code) {
+        return defineClass(null, code, 0, code.length);
+    }
+}

vul/vul-springboot4-webflux/src/main/java/com/reajason/javaweb/vul/springboot4/VulSpringboot4Application.java

@@ -0,0 +1,13 @@
+package com.reajason.javaweb.vul.springboot4;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class VulSpringboot4Application {
+
+	public static void main(String[] args) {
+		SpringApplication.run(VulSpringboot4Application.class, args);
+	}
+
+}

vul/vul-springboot4-webflux/src/main/java/com/reajason/javaweb/vul/springboot4/controller/Base64ClassLoaderController.java

@@ -0,0 +1,35 @@
+package com.reajason.javaweb.vul.springboot4.controller;
+
+import com.reajason.javaweb.vul.springboot4.ClassDefiner;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+import org.springframework.web.server.ServerWebExchange;
+import reactor.core.publisher.Mono;
+
+import java.util.Base64;
+
+/**
+ * @author ReaJason
+ * @since 2024/12/22
+ */
+@RestController
+@RequestMapping("/b64")
+public class Base64ClassLoaderController {
+
+    @PostMapping
+    public Mono<String> handleFormSubmission(ServerWebExchange exchange) {
+        return exchange.getFormData()
+                .flatMap(formData -> {
+                    String data = formData.getFirst("data");
+                    byte[] bytes = Base64.getDecoder().decode(data);
+                    Object o = null;
+                    try {
+                        o = new ClassDefiner(Thread.currentThread().getContextClassLoader()).defineClass(bytes).newInstance();
+                    } catch (Exception e) {
+                        throw new RuntimeException(e);
+                    }
+                    return Mono.just(o.toString());
+                });
+    }
+}

vul/vul-springboot4-webflux/src/main/java/com/reajason/javaweb/vul/springboot4/controller/IndexController.java

@@ -0,0 +1,123 @@
+package com.reajason.javaweb.vul.springboot4.controller;
+
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.lang.reflect.Field;
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+import java.util.zip.GZIPInputStream;
+
+/**
+ * @author ReaJason
+ * @since 2024/12/22
+ */
+@RestController
+public class IndexController {
+
+    @RequestMapping("/test")
+    public String test() throws ClassNotFoundException, InvocationTargetException, NoSuchMethodException, IllegalAccessException {
+        return "";
+    }
+
+    @SuppressWarnings("all")
+    public static Object invokeMethod(Object obj, String methodName) throws
+            Exception {
+        return invokeMethod(obj, methodName, new Class[0], new Object[0]);
+    }
+
+    @SuppressWarnings("all")
+    public static Object invokeMethod(Object obj, String methodName, Class<?>[] paramClazz, Object[] param) throws
+            Exception {
+        Class<?> clazz = (obj instanceof Class) ? (Class<?>) obj : obj.getClass();
+        Method method = null;
+        while (clazz != null && method == null) {
+            try {
+                if (paramClazz == null) {
+                    method = clazz.getDeclaredMethod(methodName);
+                } else {
+                    method = clazz.getDeclaredMethod(methodName, paramClazz);
+                }
+            } catch (NoSuchMethodException e) {
+                clazz = clazz.getSuperclass();
+            }
+        }
+        if (method == null) {
+            throw new NoSuchMethodException("Method not found: " + methodName);
+        }
+        method.setAccessible(true);
+        return method.invoke(obj instanceof Class ? null : obj, param);
+    }
+
+    @SuppressWarnings("all")
+    public static byte[] decodeBase64(String base64Str) throws Exception {
+        Class<?> decoderClass;
+        try {
+            decoderClass = Class.forName("java.util.Base64");
+            Object decoder = decoderClass.getMethod("getDecoder").invoke(null);
+            return (byte[]) decoder.getClass().getMethod("decode", String.class).invoke(decoder, base64Str);
+        } catch (Exception ignored) {
+            decoderClass = Class.forName("sun.misc.BASE64Decoder");
+            return (byte[]) decoderClass.getMethod("decodeBuffer", String.class).invoke(decoderClass.newInstance(), base64Str);
+        }
+    }
+
+    @SuppressWarnings("all")
+    public static byte[] gzipDecompress(byte[] compressedData) throws IOException {
+        ByteArrayOutputStream out = new ByteArrayOutputStream();
+        GZIPInputStream gzipInputStream = null;
+
+        try {
+            gzipInputStream = new GZIPInputStream(new ByteArrayInputStream(compressedData));
+            byte[] buffer = new byte[4096];
+            int n;
+            while ((n = gzipInputStream.read(buffer)) > 0) {
+                out.write(buffer, 0, n);
+            }
+        } finally {
+            if (gzipInputStream != null) {
+                try {
+                    gzipInputStream.close();
+                } catch (IOException ignored) {
+                }
+            }
+            out.close();
+        }
+        return out.toByteArray();
+    }
+
+    @SuppressWarnings("all")
+    public static Field getField(Object obj, String name) throws NoSuchFieldException, IllegalAccessException {
+        for (Class<?> clazz = obj.getClass();
+             clazz != Object.class;
+             clazz = clazz.getSuperclass()) {
+            try {
+                return clazz.getDeclaredField(name);
+            } catch (NoSuchFieldException ignored) {
+
+            }
+        }
+        throw new NoSuchFieldException(name);
+    }
+
+
+    @SuppressWarnings("all")
+    public static Object getFieldValue(Object obj, String name) throws NoSuchFieldException, IllegalAccessException {
+        try {
+            Field field = getField(obj, name);
+            field.setAccessible(true);
+            return field.get(obj);
+        } catch (NoSuchFieldException ignored) {
+        }
+        return null;
+    }
+
+    @GetMapping("/")
+    public String index() {
+        return "hello";
+    }
+}

vul/vul-springboot4-webflux/src/main/resources/application.properties

@@ -0,0 +1 @@
+spring.application.name=vul-springboot4