A new vulnerability with the identifier CVE-2024-9665 has recently been discovered that affects Zimbra installations. This article will discuss the vulnerability, the potential consequences of exploitation, and how you can protect your Zimbra installation from being compromised.

What is Zimbra?

Zimbra is a widely-used, powerful email and collaboration platform developed by Synacor Inc. that is used by millions of users and enterprises worldwide. It is designed to be secure, flexible, and extensible, but like any software, it is not immune to vulnerabilities.

What is CVE-2024-9665?

CVE-2024-9665 is a vulnerability within the Zimbra GraphQL implementation. It allows remote attackers to disclose sensitive information on affected installations of Zimbra. The exploitation of this vulnerability requires user interaction, meaning the target must open a malicious email message.

This specific vulnerability originates from the lack of proper protections against cross-site request forgery (CSRF) attacks. Due to this, attackers can exploit the vulnerability to disclose information in the context of the target email account. It was identified by the Zero Day Initiative (ZDI) and assigned the ZDI ID of ZDI-CAN-23939.

How does the vulnerability work?

To better understand the vulnerability, let's take a look at a sample code snippet that demonstrates a simple CSRF attack:

<html>
  <body>
    <form action="http://victim.com/zimbra/graphql"; method="POST" enctype="application/x-www-form-urlencoded" id="csrf_form">
      <input type="hidden" name="query" value="{email_inbox{messages{subject,body}}}" />
    </form>
    <script>
      document.getElementById("csrf_form").submit();
    </script>
  </body>
</html>

By embedding this code in a malicious email message and sending it to a target user, an attacker could exploit the vulnerability to disclose sensitive information from the target's email account. This is due to the fact that Zimbra does not include proper anti-CSRF tokens or checks in its GraphQL implementation.

How can the vulnerability be mitigated and resolved?

To protect your Zimbra installation from this vulnerability, it is essential to follow best practices for CSRF protection. In order to do so, you need to implement proper anti-CSRF tokens and checks in the GraphQL implementation. This will help ensure that the server only accepts legitimate requests and rejects CSRF attacks.

Additionally, staying up-to-date with the latest security patches is crucial. Synacor Inc. regularly releases patches and updates for Zimbra, so make sure to keep your installation updated.

Original references and disclosure details

You can find further information about this vulnerability, including the original disclosure details and ZDI information, in the following links:

1. ZDI-CAN-23939: Zimbra Zimlet Package JavaScript API Cross Site Request Forgery Information Disclosure Vulnerability
2. CVE-2024-9665: Zimbra GraphQL Cross-Site Request Forgery Information Disclosure Vulnerability

Conclusion

CVE-2024-9665 is a critical information disclosure vulnerability in the Zimbra email platform. By staying informed, implementing proper CSRF protections, and applying security patches, users and administrators can protect their Zimbra installations and sensitive information from being compromised by remote attackers.

Timeline

Published on: 11/22/2024 21:15:23 UTC
Last modified on: 01/03/2025 21:58:29 UTC