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User IDs and Nextcloud server leaked to Nextcloud Lookup server with disabled settings (NC-SA-2019-016)

26th June 2019

Risk level: Low

CVSS v3 Base Score: 5.3 (AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N)

CWE: Exposure of Private Information (CWE-359)

HackerOne report: 508490

Description

Exposure of Private Information in Nextcloud Server 16.0.1 causes the server to send it's domain and user IDs to the Nextcloud Lookup Server without any further data when the Lookup server is disabled.

Affected Software

  • Nextcloud Server < 16.0.2 (CVE-2019-15623)
  • Nextcloud Server < 15.0.9 (CVE-2019-15623)
  • Nextcloud Server < 14.0.13 (CVE-2019-15623)

Action Taken

The error has been fixed.

Resolution

It is recommended that the Nextcloud Server is upgraded to 16.0.2.

Acknowledgements

The Nextcloud team thanks the following people for their research and responsible disclosure of the above advisory:

  • Leon Klingele - Vulnerability discovery and disclosure.

This advisory is licensed CC BY-SA 4.0.

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