Improper access control in Zulip Server - CVE-2021-3967
Published: February 28, 2022
Vulnerability identifier: #VU60898
CSH Severity: Medium
CVSS v4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2021-3967
CWE-ID: CWE-284
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to gain unauthorized access to otherwise restricted functionality.
The vulnerability exists due to improper access restrictions. A remote user who gets the user's valid session can call vulnerable API to extract the api_key value without user's password.
Affected software
Zulip Server
How to mitigate CVE-2021-3967
Install updates from vendor's website.
Zulip Server - update to 4.10