SB2023082527 - Improper authorization in Zulip Server
Published: August 25, 2023
Security Bulletin ID
SB2023082527
Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Data manipulation
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Improper Authorization (CVE-ID: CVE-2023-32678)
The vulnerability allows a remote user to gain access to restricted functionality.
The vulnerability exists due to improper authorization. Authenticated users who used to be subscribed to a private stream, and have since been removed from it, retained the ability to edit messages/topics and delete messages that they used to have access to, if other relevant organization permissions allowed these actions. For example, a user may have still been able to edit or delete their old messages they had posted in such a private stream.
Remediation
Install update from vendor's website.