// For flags

CVE-2021-21318

Removing access may not effect published series

Severity Score

5.4
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

-
*SSVC
Descriptions

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.

Opencast es una plataforma gratuita de código abierto para respaldar la administración de contenido educativo de audio y video. En Opencast versiones anteriores a 9.2, se presenta una vulnerabilidad en la que la publicación de un episodio con reglas de acceso estrictas sobrescribirá el acceso a la serie configurada actualmente. Esto permite una fácil denegación de acceso para todos los usuarios sin privilegios de superusuario, ocultando efectivamente la serie. El acceso a series y metadatos de series en el servicio de búsqueda (mostrado en módulo multimedia y reproductor) depende de los eventos publicados que forman parte de la serie. La publicación de un evento publicará automáticamente una serie y actualizará el acceso a ella. Eliminar un evento o volver a publicarlo debería hacer lo mismo. Es posible que las versiones afectadas de Opencast no actualicen el acceso a la serie ni eliminen una serie publicada si un evento ha sido eliminado. Al eliminar un episodio, esto puede conllevar a una lista de control de acceso para los metadatos de la serie con reglas de acceso más amplias que las reglas de acceso combinadas de todos los eventos restantes, o que los metadatos de la serie sigan estando disponibles aunque todos los episodios de esa serie hayan sido eliminados. Este problema se corrigió en Opencast versión 9.2

*Credits: N/A
CVSS Scores
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
Low
Attack Vector
Network
Attack Complexity
Low
Authentication
Single
Confidentiality
None
Integrity
Partial
Availability
Partial
* Common Vulnerability Scoring System
SSVC
  • Decision:-
Exploitation
-
Automatable
-
Tech. Impact
-
* Organization's Worst-case Scenario
Timeline
  • 2020-12-22 CVE Reserved
  • 2021-02-18 CVE Published
  • 2023-03-08 EPSS Updated
  • 2024-08-03 CVE Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-863: Incorrect Authorization
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Apereo
Search vendor "Apereo"
Opencast
Search vendor "Apereo" for product "Opencast"
< 9.2
Search vendor "Apereo" for product "Opencast" and version " < 9.2"
-
Affected