Vulnerability Details : 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
Vulnerability category: BypassGain privilege
Products affected by CVE-2020-5206
- cpe:2.3:a:apereo:opencast:*:*:*:*:*:*:*:*
- cpe:2.3:a:apereo:opencast:8.0:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2020-5206
0.17%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 54 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2020-5206
Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
---|---|---|---|---|---|---|
6.4
|
MEDIUM | AV:N/AC:L/Au:N/C:P/I:P/A:N |
10.0
|
4.9
|
NIST | |
10.0
|
CRITICAL | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N |
3.9
|
5.8
|
NIST | |
8.7
|
HIGH | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N |
2.3
|
5.8
|
GitHub, Inc. |
CWE ids for CVE-2020-5206
-
The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action.Assigned by: security-advisories@github.com (Secondary)
-
When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.Assigned by: nvd@nist.gov (Primary)
References for CVE-2020-5206
-
https://github.com/opencast/opencast/security/advisories/GHSA-vmm6-w4cf-7f3x
Authentication Bypass For Endpoints With Anonymous Access · Advisory · opencast/opencast · GitHubMitigation;Third Party Advisory
-
https://github.com/opencast/opencast/commit/b157e1fb3b35991ca7bf59f0730329fbe7ce82e8
Authentication Bypass For Endpoints With Anonymous Access · opencast/opencast@b157e1f · GitHubPatch
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