CVE-2021-21318 Information

Description

Opencast is a free open-source platform to support the management of educational audio and video content. In Opencast before version 9.2 there is a vulnerability in which publishing an episode with strict access rules will overwrite the currently set series access. This allows for an easy denial of access for all users without superuser privileges effectively hiding the series. Access to series and series metadata on the search service (shown in media module and player) depends on the events published which are part of the series. Publishing an event will automatically publish a series and update access to it. Removing an event or republishing the event should do the same. Affected versions of Opencast may not update the series access or remove a published series if an event is being removed. On removal of an episode this may lead to an access control list for series metadata with broader access rules than the merged access rules of all remaining events or the series metadata still being available although all episodes of that series have been removed. This problem is fixed in Opencast 9.2.

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L

Reference

https://github.com/opencast/opencast/commit/b18c6a7f81f08ed14884592a6c14c9ab611ad450 https://github.com/opencast/opencast/security/advisories/GHSA-vpc2-3wcv-qj4w

Attack Complexity

LOW

Privileges Required

LOW

User Interaction Required

LOW

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

NONE

Availability Impact

LOW

Base Score

LOW

Base Severity

5.4