Auth bypass in Apereo Opencast
CVE-2020-5206
In Opencast before 7.6 and 8.1, using a remember-me cookie with an arbitrary username can cause Opencast to assume proper authentication for that user even if the remember-me cookie was incorrect given that the attacked endpoint also allows anonymous access. This way, an attacker can, for example, fake a remember-me token, assume the identity of the global system administrator and request non-public content from the search service without ever providing any proper authentication. This problem is fixed in Opencast 7.6 and Opencast 8.1
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.7 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N.
EPSS exploit prediction
EPSS: 0.013 (69.2th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 69th percentile — 69.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.013 · newest: 0.013 · 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-vmm6-w4cf-7f3x (Third Party Advisory, Mitigation)
- github.com/opencast/opencast/commit/b157e1fb3b35991ca7bf59f0730329fbe7ce82e8 (Patch)
Frequently asked questions
- What is CVE-2020-5206?
- CVE-2020-5206 is a high-severity vulnerability in Apereo Opencast, classified under Improper Authorization. CVSS score: 8.7/10. Published 2020-01-30.
- How severe is CVE-2020-5206?
- High severity. CVSS v3 base score is 8.7 out of 10.