CVE-2021-21318
Opencast Series Metadata Access Control Vulnerability
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.
INFO
Published Date :
Feb. 18, 2021, 6:15 p.m.
Last Modified :
Feb. 26, 2021, 4:04 a.m.
Source :
[email protected]
Remotely Exploitable :
Yes !
Impact Score :
2.5
Exploitability Score :
2.8
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2021-21318.
| URL | Resource |
|---|---|
| https://github.com/opencast/opencast/commit/b18c6a7f81f08ed14884592a6c14c9ab611ad450 | Patch Third Party Advisory |
| https://github.com/opencast/opencast/security/advisories/GHSA-vpc2-3wcv-qj4w | Third Party Advisory |
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2021-21318 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-21318 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
Initial Analysis by [email protected]
Feb. 26, 2021
Action Type Old Value New Value Added CVSS V2 NIST (AV:N/AC:L/Au:S/C:N/I:P/A:P) Added CVSS V3.1 NIST AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L Changed Reference Type https://github.com/opencast/opencast/commit/b18c6a7f81f08ed14884592a6c14c9ab611ad450 No Types Assigned https://github.com/opencast/opencast/commit/b18c6a7f81f08ed14884592a6c14c9ab611ad450 Patch, Third Party Advisory Changed Reference Type https://github.com/opencast/opencast/security/advisories/GHSA-vpc2-3wcv-qj4w No Types Assigned https://github.com/opencast/opencast/security/advisories/GHSA-vpc2-3wcv-qj4w Third Party Advisory Added CPE Configuration OR *cpe:2.3:a:apereo:opencast:*:*:*:*:*:*:*:* versions up to (excluding) 9.2
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-21318 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2021-21318
weaknesses.
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
0.08 }} 0.00%
score
0.30714
percentile