Auth bypass in Apereo Opencast
CVE-2020-5228
Opencast before 8.1 and 7.6 allows unauthorized public access to all media and metadata by default via OAI-PMH. OAI-PMH is part of the default workflow and is activated by default, requiring active user intervention of users to protect media. This leads to users unknowingly handing out public access to events without their knowledge. The problem has been addressed in Opencast 7.6 and 8.1 where the OAI-PMH endpoint is configured to require users with `ROLE_ADMIN` by default. In addition to this, Opencast 9 removes the OAI-PMH publication from the default workflow, making the publication a conscious decision users have to make by updating their workflows.
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.6 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N.
EPSS exploit prediction
EPSS: 0.010 (60.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 61st percentile — 60.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.010 · newest: 0.010 · change: 0.000
Affected products
- Apereo Opencast — versions 8.0
- Opencast — versions < 7.6, >= 8.0, < 8.1
Weakness classification (CWE)
References
- github.com/opencast/opencast/security/advisories/GHSA-6f54-3qr9-pjgj (Third Party Advisory, Mitigation)
- github.com/opencast/opencast/blob/1fb812c7810c78f09f29a7f455ff920417924307/etc/… (Patch)
Frequently asked questions
- What is CVE-2020-5228?
- CVE-2020-5228 is a high-severity vulnerability in Apereo Opencast, classified under Missing Authorization. CVSS score: 7.6/10. Published 2020-01-30.
- How severe is CVE-2020-5228?
- High severity. CVSS v3 base score is 7.6 out of 10.