CVE-2021-43807: HTTP Method Spoofing in Opencast
First published: Tue Dec 14 2021(Updated: )
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.
Credit: security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Apereo Opencast | <9.10 |
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Reference Links
- https://github.com/opencast/opencast/commit/59cb6731067283e54f15462be38b6117d8b9ea8b#diff-9c5fb3d1b7e3b0f54bc5c4182965c4fe1f9023d449017cece3005d3f90e8e4d8
- https://github.com/opencast/opencast/commit/8f8271e1085f6f8e306c689d6a56b0bb8d076444
- https://github.com/opencast/opencast/security/advisories/GHSA-j4mm-7pj3-jf7v
Frequently Asked Questions
What is CVE-2021-43807?
CVE-2021-43807 is a vulnerability in the Open Source Lecture Capture & Video Management software Opencast versions prior to 9.10 that allows HTTP method spoofing.
What is HTTP method spoofing?
HTTP method spoofing is when an attacker can change the assumed HTTP method via URL parameter, allowing them to manipulate GET requests into PUT requests or send DELETE requests.
How does CVE-2021-43807 affect Opencast?
CVE-2021-43807 affects Opencast versions prior to 9.10, allowing HTTP method spoofing.
What is the severity of CVE-2021-43807?
The severity of CVE-2021-43807 is high, with a severity score of 6.5.
How can I fix CVE-2021-43807?
To fix CVE-2021-43807, update Opencast to version 9.10 or newer.
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