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Bypass received read-only share permissions using read-write reshare

Platform: ownCloud Server

Versions: 9.0.6, 9.1.2,

Date: 12/20/2016

Risk level: Medium

CVSS v3 Base Score: 6.5 (AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:H/A:N)

CWE: Permission Issues (CWE-275)

Description

User can upload and modify the link share contents even though the original sharer has only read-only access.

Affected Software

Action Taken

Make share permission check work correctly from share manager.

Acknowledgements

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

  • Sergio Bertolin – Vulnerability discovery and disclosure.

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