Auth bypass in Zulip
CVE-2022-31168
Zulip is an open source team chat tool. Due to an incorrect authorization check in Zulip Server 5.4 and earlier, a member of an organization could craft an API call that grants organization administrator privileges to one of their bots. The vulnerability is fixed in Zulip Server 5.5. Members who don’t own any bots, and lack permission to create them, can’t exploit the vulnerability. As a workaround for the vulnerability, an organization administrator can restrict the `Who can create bots` permission to administrators only, and change the ownership of existing bots.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.008 (56.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 57th percentile — 56.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: +0.000
Affected products
- Zulip — versions < 5.5
Weakness classification (CWE)
References
- github.com/zulip/zulip/security/advisories/GHSA-c3cp-ggg5-9xw5 (Third Party Advisory)
- github.com/zulip/zulip/commit/751b2a03e565e9eb02ffe923b7c24ac73d604034 (Patch, Third Party Advisory)
- github.com/zulip/zulip/releases/tag/5.5 (Third Party Advisory, Release Notes)
Frequently asked questions
- What is CVE-2022-31168?
- CVE-2022-31168 is a medium-severity vulnerability in Zulip, classified under Improper Authorization. CVSS score: 5.4/10. Published 2022-07-22.
- How severe is CVE-2022-31168?
- Medium severity. CVSS v3 base score is 5.4 out of 10.