CVE-2021-21318: Removing access may not effect published series
First published: Thu Feb 18 2021(Updated: )
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.
Credit: security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Apereo Opencast | <9.2 |
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Reference Links
Frequently Asked Questions
What is CVE-2021-21318?
CVE-2021-21318 is a vulnerability in Opencast, an open-source platform for managing educational audio and video content.
What is the severity of CVE-2021-21318?
The severity of CVE-2021-21318 is medium with a CVSS score of 5.4.
How does CVE-2021-21318 affect Opencast?
CVE-2021-21318 allows a denial of service attack by overwriting the currently set series access when publishing an episode with strict access rules in Opencast before version 9.2.
How can I fix CVE-2021-21318?
To fix CVE-2021-21318, update Opencast to version 9.2 or higher.
Where can I find more information about CVE-2021-21318?
You can find more information about CVE-2021-21318 on the Opencast GitHub repository and security advisory.
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