Improper Authorization in Zulip Server

1) Improper Authorization

EUVDB-ID: #VU65765

Risk: Medium

CVSSv3.1: 7.7 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2022-31168

CWE-ID: CWE-285 - Improper Authorization

Exploit availability: No

Description

The vulnerability allows a remote attacker to bypass authorization checks.

The vulnerability exists due to an incorrect authorization check. A remote user can use a specially crafted API call and gain elevated privileges on the target system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Zulip Server: 5.0 - 5.4

External links

http://github.com/zulip/zulip/releases/tag/5.5
http://github.com/zulip/zulip/commit/751b2a03e565e9eb02ffe923b7c24ac73d604034
http://github.com/zulip/zulip/security/advisories/GHSA-c3cp-ggg5-9xw5

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.