Bulk list client endpoint exposes too much metadata about a client
CVE-2021-21396

6.5MEDIUM

Key Information:

Vendor

Wireapp

Status
Wire-server
Vendor
CVE Published:
26 March 2021

What is 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.

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Affected Version(s)

wire-server >= 2021-02-16, < 2021-03-02

References

https://github.com/wireapp/wire-server/security/advisorie...
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https://github.com/wireapp/wire-server/releases/tag/v2021...
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https://github.com/wireapp/wire-server/commit/7ba2bf41402...
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CVSS V3.1

Score:
6.5
Severity:
MEDIUM
Confidentiality:
High
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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