Information disclosure in Zulip Server - CVE-2021-30479
Published: April 19, 2021
Vulnerability identifier: #VU52316
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2021-30479
CWE-ID: CWE-200
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to gain access to potentially sensitive information.
The vulnerability exists due to excessive data output by the application in the implementation of the "all_public_streams" API feature. A remote attacker can receive message traffic to public streams that should have been only accessible to members of the organization.
Affected software
Zulip Server
How to mitigate CVE-2021-30479
Install updates from vendor's website.
Zulip Server - update to 3.4