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Possibility to extend internal-share permissions using the API

Platform: ownCloud Server

Versions: 10,

Date: 7/25/2019

Risk level: High

CVSS v3 Base Score: 8 (Improper Privilege Management (CWE-269)

Description

An Attacker can extend the permission of a received subfolder share using the ocs api. Additional risk exists because the previlege extension is also possible on public-shares.

Affected Software

Action Taken

Added better checks which prevent extending the permission to OCS-API.

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