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Removing access may not effect published series

Low
lkiesow published GHSA-vpc2-3wcv-qj4w Feb 17, 2021

Package

maven search-service-impl (Maven)

Affected versions

< 9.2

Patched versions

9.2

Description

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.

Opencast before version 9.2 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.
  • The series metadata still being available although all episodes of that series have been removed.

Patches

This problem is fixed in Opencast 9.2.

Workarounds

Without the patch, 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.

References

For technical details, take a look at the patch fixing the issue: b18c6a7

For more information

If you have any questions or comments about this advisory:

Severity

Low

CVE ID

CVE-2021-21318

Weaknesses

No CWEs

Credits