Vulnerability Details : CVE-2021-43807
Potential exploit
Opencast is an Open Source Lecture Capture & Video Management for Education. Opencast versions prior to 9.10 allow HTTP method spoofing, allowing to change the assumed HTTP method via URL parameter. This allows attackers to turn HTTP GET requests into PUT requests or an HTTP form to send DELETE requests. This bypasses restrictions otherwise put on these types of requests and aids in cross-site request forgery (CSRF) attacks, which would otherwise not be possible. The vulnerability allows attackers to craft links or forms which may change the server state. This issue is fixed in Opencast 9.10 and 10.0. You can mitigate the problem by setting the `SameSite=Strict` attribute for your cookies. If this is a viable option for you depends on your integrations. We strongly recommend updating in any case.
Vulnerability category: Cross-site request forgery (CSRF)
Products affected by CVE-2021-43807
- cpe:2.3:a:apereo:opencast:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2021-43807
0.37%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 56 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-43807
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
4.3
|
MEDIUM | AV:N/AC:M/Au:N/C:N/I:P/A:N |
8.6
|
2.9
|
NIST | |
|
6.5
|
MEDIUM | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N |
2.8
|
3.6
|
NIST | |
|
7.5
|
HIGH | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H |
1.6
|
5.9
|
GitHub, Inc. |
CWE ids for CVE-2021-43807
-
This attack-focused weakness is caused by incorrectly implemented authentication schemes that are subject to spoofing attacks.Assigned by: security-advisories@github.com (Primary)
References for CVE-2021-43807
-
https://github.com/opencast/opencast/security/advisories/GHSA-j4mm-7pj3-jf7v
HTTP Method Spoofing · Advisory · opencast/opencast · GitHubExploit;Patch;Third Party Advisory
-
https://github.com/opencast/opencast/commit/8f8271e1085f6f8e306c689d6a56b0bb8d076444
Update CXF · opencast/opencast@8f8271e · GitHubPatch;Third Party Advisory
-
https://github.com/opencast/opencast/commit/59cb6731067283e54f15462be38b6117d8b9ea8b#diff-9c5fb3d1b7e3b0f54bc5c4182965c4fe1f9023d449017cece3005d3f90e8e4d8
Update CXF · opencast/opencast@59cb673 · GitHubPatch;Third Party Advisory
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