CVE-2021-43821

HIGH
Published Dec 14, 20214y ago · Modified Jun 17, 20262w ago
7.7 CVSS 3.1
High
Find Similar
Published Dec 14, 2021 4y ago
Last Modified Jun 17, 2026 2w ago

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.

CVSS Details

Base Score
7.7
Exploitability
3.1
Impact
4.0
Vector string
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
Attack Vector Network
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Changed
Confidentiality High
Integrity None
Availability None

Threat Intelligence

No active exploitation signals — not in CISA KEV and no EPSS score yet.

Exploit & Patch Status
Public Exploit Known
Patch Available

Weaknesses 1

CWE-552

Affected Products 1

VendorProductVersionRange
apereoopencast* <10.6

References 4

  • github.com https://github.com/opencast/opencast/blob/69952463971cf578363e3b97d8edaf334ff51253/modules/ingest-service-impl/src/main/java/org/opencastproject/ingest/impl/IngestServiceImpl.java#L1587
    PatchThird Party Advisory
  • github.com https://github.com/opencast/opencast/commit/65c46b9d3e8f045c544881059923134571897764
    PatchThird Party Advisory
  • github.com https://github.com/opencast/opencast/security/advisories/GHSA-59g4-hpg3-3gcp
    ExploitThird Party Advisory
  • mvnrepository.com https://mvnrepository.com/artifact/org.opencastproject/opencast-ingest-service-impl
    Third Party Advisory

Remediation

  • github.com https://github.com/opencast/opencast/blob/69952463971cf578363e3b97d8edaf334ff51253/modules/ingest-service-impl/src/main/java/org/opencastproject/ingest/impl/IngestServiceImpl.java#L1587
    PatchThird Party Advisory
  • github.com https://github.com/opencast/opencast/commit/65c46b9d3e8f045c544881059923134571897764
    PatchThird Party Advisory