jndi-ldap-test-server

This is a minimalistic LDAP server that is meant for test vulnerability to JNDI+LDAP injection attacks in Java, especially CVE-2021-44228.

How to test vulnerability to CVE-2021-44228

1. Download the test server binary for your platform (you can find all binaries under Releases).

2. Run the test server on some IP address accessible by the application you want to test. It's the easiest if you can run the server on the same host as your app (localhost).

3. Find any untrusted externally provided that your application receives from the outside and logs.

4. Force your app to log a string that includes:

   ${jndi:ldap://localhost:1389/Test}
   

   Please replace localhost with your own servers' IP or domain name if you're not running the test server locally.

   For instance, if you are running an HTTP server which is logging the User-Agent HTTP header, you can test for vulnerability by calling this cURL command while the test server is running:

   curl my-host -H 'User-Agent: ${jndi:ldap://test-server-host:1389/Test}'

5. If your application is vulnerable, you should see an incoming connection on the test server, and the injected string will be replaced by the text !!! VULNERABLE !!! in your logs. If your application is not vulnerable, the injected string should not be substituted and the test server should not receive any connection.