CVE-2021-21396 : wire-server is an open-source back end for Wire, a secure collaboration platform

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.

Published 2021-03-26 22:15:13

Updated 2021-08-27 15:05:47

Source GitHub, Inc.

View at NVD, CVE.org

Vulnerability category: Information leak

Products affected by CVE-2021-21396

Wire » Wire Server
Versions from including (>=) 2021-02-16 and before (<) 2021-03-02
cpe:2.3:a:wire:wire_server:*:*:*:*:*:*:*:*
Matching versions

Exploit prediction scoring system (EPSS) score for CVE-2021-21396

EPSS FAQ

0.32%

Probability of exploitation activity in the next 30 days EPSS Score History

~ 52 %

Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2021-21396

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Score Source
4.0	MEDIUM	AV:N/AC:L/Au:S/C:P/I:N/A:N	8.0	2.9	NIST
Access Vector: Network Access Complexity: Low Authentication: Single Confidentiality Impact: Partial Integrity Impact: None Availability Impact: None
6.5	MEDIUM	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N	2.8	3.6	NIST
Attack Vector: Network Attack Complexity: Low Privileges Required: Low User Interaction: None Scope: Unchanged Confidentiality: High Integrity: None Availability: None
6.5	MEDIUM	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N	2.8	3.6	GitHub, Inc.
Attack Vector: Network Attack Complexity: Low Privileges Required: Low User Interaction: None Scope: Unchanged Confidentiality: High Integrity: None Availability: None

CWE ids for CVE-2021-21396

CWE-200 Exposure of Sensitive Information to an Unauthorized Actor

The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.

Assigned by: security-advisories@github.com (Primary)

References for CVE-2021-21396

https://github.com/wireapp/wire-server/commit/7ba2bf4140282557cf215e0b2c354d4d08cd3421

Return PubClient instead of Client from /users/list-clients (#1391) · wireapp/wire-server@7ba2bf4 · GitHub
Patch;Third Party Advisory
https://github.com/wireapp/wire-server/security/advisories/GHSA-qx8q-rhq2-rg4j

Bulk list client endpoint exposes too much metadata about a client · Advisory · wireapp/wire-server · GitHub
Patch;Third Party Advisory
https://github.com/wireapp/wire-server/releases/tag/v2021-03-02

Release 2021-03-02 · wireapp/wire-server · GitHub
Third Party Advisory

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Vulnerability Details : CVE-2021-21396

Products affected by CVE-2021-21396

Exploit prediction scoring system (EPSS) score for CVE-2021-21396

CVSS scores for CVE-2021-21396

CWE ids for CVE-2021-21396

References for CVE-2021-21396