Information disclosure in Wire Server
CVE-2021-21396
wire-server is an open-source back end for Wire, a secure collaboration platform. In wire-server from version 2021-02-16 and before version 2021-03-02, the client metadata of all users was exposed in the `GET /users/list-clients` endpoint. The endpoint could be used by any logged in user who could request client details of any other user (no connection required) as far as they can find their User ID. The exposed metadata included id, class, type, location, time, and cookie. A user on a Wire backend could use this endpoint to find registration time and location for each device for a given list of users. As a workaround, remove `/list-clients` from nginx config. This has been fixed in version 2021-03-02.
Vulnerability class: Information Disclosure
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.011 (64.1th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 64th percentile — 64.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.011 · newest: 0.011 · change: 0.000
Affected products
- Wire Server
- Wireapp Wire-Server — versions >= 2021-02-16, < 2021-03-02
Weakness classification (CWE)
References
- github.com/wireapp/wire-server/security/advisories/GHSA-qx8q-rhq2-rg4j (Patch, Third Party Advisory)
- github.com/wireapp/wire-server/releases/tag/v2021-03-02 (Third Party Advisory)
- github.com/wireapp/wire-server/commit/7ba2bf4140282557cf215e0b2c354d4d08cd3421 (Patch, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-21396?
- CVE-2021-21396 is a medium-severity vulnerability in Wire Server, classified under Information Disclosure. CVSS score: 6.5/10. Published 2021-03-26.
- How severe is CVE-2021-21396?
- Medium severity. CVSS v3 base score is 6.5 out of 10.