CVE-2021-43821
Opencast Local File Inclusion Vulnerability
Description
Opencast is an Open Source Lecture Capture & Video Management for Education. Opencast before version 9.10 or 10.6 allows references to local file URLs in ingested media packages, allowing attackers to include local files from Opencast's host machines and making them available via the web interface. Before Opencast 9.10 and 10.6, Opencast would open and include local files during ingests. Attackers could exploit this to include most local files the process has read access to, extracting secrets from the host machine. An attacker would need to have the privileges required to add new media to exploit this. But these are often widely given. The issue has been fixed in Opencast 10.6 and 11.0. You can mitigate this issue by narrowing down the read access Opencast has to files on the file system using UNIX permissions or mandatory access control systems like SELinux. This cannot prevent access to files Opencast needs to read though and we highly recommend updating.
INFO
Published Date :
Dec. 14, 2021, 8:15 p.m.
Last Modified :
Dec. 20, 2021, 8:48 p.m.
Source :
[email protected]
Remotely Exploitable :
Yes !
Impact Score :
6.0
Exploitability Score :
3.1
Public PoC/Exploit Available at Github
CVE-2021-43821 has a 5 public PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
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-2021-43821.
| URL | Resource |
|---|---|
| https://github.com/opencast/opencast/blob/69952463971cf578363e3b97d8edaf334ff51253/modules/ingest-service-impl/src/main/java/org/opencastproject/ingest/impl/IngestServiceImpl.java#L1587 | Patch Third Party Advisory |
| https://github.com/opencast/opencast/commit/65c46b9d3e8f045c544881059923134571897764 | Patch Third Party Advisory |
| https://github.com/opencast/opencast/security/advisories/GHSA-59g4-hpg3-3gcp | Exploit Third Party Advisory |
| https://mvnrepository.com/artifact/org.opencastproject/opencast-ingest-service-impl | 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).
All CVE - PoC in GitHub
poc proofofconcept tester allcve cvegithub cvenew cvepoc cveupdate
None
None
None
opencast cve-2021-43821敏感信息泄露漏洞环境
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2021-43821 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-43821 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.
-
CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
Initial Analysis by [email protected]
Dec. 20, 2021
Action Type Old Value New Value Added CVSS V2 NIST (AV:N/AC:L/Au:S/C:P/I:N/A:N) Added CVSS V3.1 NIST AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N Changed Reference Type https://github.com/opencast/opencast/blob/69952463971cf578363e3b97d8edaf334ff51253/modules/ingest-service-impl/src/main/java/org/opencastproject/ingest/impl/IngestServiceImpl.java#L1587 No Types Assigned https://github.com/opencast/opencast/blob/69952463971cf578363e3b97d8edaf334ff51253/modules/ingest-service-impl/src/main/java/org/opencastproject/ingest/impl/IngestServiceImpl.java#L1587 Patch, Third Party Advisory Changed Reference Type https://github.com/opencast/opencast/commit/65c46b9d3e8f045c544881059923134571897764 No Types Assigned https://github.com/opencast/opencast/commit/65c46b9d3e8f045c544881059923134571897764 Patch, Third Party Advisory Changed Reference Type https://github.com/opencast/opencast/security/advisories/GHSA-59g4-hpg3-3gcp No Types Assigned https://github.com/opencast/opencast/security/advisories/GHSA-59g4-hpg3-3gcp Exploit, Third Party Advisory Changed Reference Type https://mvnrepository.com/artifact/org.opencastproject/opencast-ingest-service-impl No Types Assigned https://mvnrepository.com/artifact/org.opencastproject/opencast-ingest-service-impl Third Party Advisory Added CWE NIST CWE-552 Added CPE Configuration OR *cpe:2.3:a:apereo:opencast:*:*:*:*:*:*:*:* versions up to (excluding) 10.6
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-43821 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-2021-43821
weaknesses.
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
0.14 }} 0.03%
score
0.48988
percentile