Home/CVE/wire-server is an open-source back end for Wire, a secure collaboration platform. In wire-server from version 2021-02-16
CVE

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

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.

MEDIUM · CVSS 6.5 EPSS 0.00316
Monitor
  • No active-exploitation, high-EPSS, or public-exploit signals - routine patching cadence
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-200Exposure of Sensitive Information to an Unauthorized Actor
▤

Affected Products & Versions

1
wire server>= 2021-02-16 and < 2021-03-02
▣

Scoring & Timeline

6.5
MEDIUM · CVSS v3.1 · security-advisories@github.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD26 Mar 2021 · 10:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
🔗

References & Sources

3
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://github.com/wireapp/wire-server/commit/7ba2bf4140282557cf215e0b2c354d4d08cd3421PatchThird Party Advisory
https://github.com/wireapp/wire-server/releases/tag/v2021-03-02Third Party Advisory
https://github.com/wireapp/wire-server/security/advisories/GHSA-qx8q-rhq2-rg4jPatchThird Party Advisory
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