CVE-2023-32678 : Security Advisory and Response
Learn about CVE-2023-32678 affecting Zulip, where former subscribers of private streams can edit or delete messages/topics, and how to mitigate this security risk.
This article provides insights into CVE-2023-32678, affecting Zulip, an open-source team collaboration tool.
Understanding CVE-2023-32678
This CVE highlights an insufficient authorization check vulnerability in Zulip, allowing former subscribers of private streams to edit or delete messages and topics.
What is CVE-2023-32678?
Zulip users who were previously subscribed to private streams can manipulate messages and topics, posing a risk to data integrity and security. The issue was addressed in Zulip Server version 7.3.
The Impact of CVE-2023-32678
The vulnerability could lead to unauthorized modification or deletion of sensitive content within private streams, potentially compromising the confidentiality and integrity of information.
Technical Details of CVE-2023-32678
The vulnerability is classified under CWE-285: Improper Authorization, with a CVSSv3 base score of 6.5 (Medium severity).
Vulnerability Description
Former subscribers of private streams can edit, move, or delete messages/topics they previously had access to, if other permissions permit such actions.
Affected Systems and Versions
Zulip versions prior to 7.3 are affected by this vulnerability, specifically those where former subscribers retain editing and deletion privileges.
Exploitation Mechanism
Unauthorized users can exploit this issue through the Zulip platform, leveraging their retained editing abilities in private streams.
Mitigation and Prevention
To address CVE-2023-32678, immediate action and long-term security measures are crucial.
Immediate Steps to Take
Organizations using Zulip should upgrade to version 7.3 or later to mitigate the vulnerability and prevent unauthorized access to message editing and deletion functionalities.
Long-Term Security Practices
Regularly review and update permissions within collaboration tools to ensure former subscribers do not retain unnecessary editing privileges in private streams.
Patching and Updates
Stay informed about security advisories from Zulip and promptly apply patches and updates to safeguard against vulnerabilities.