CVE-2021-43807

Public Exploit
HTTP Method Spoofing in Opencast

Description

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.

Category

7.5
CVSS
Severity: High
CVSS 3.1 •
CVSS 2.0 •
EPSS 0.37%
Third-Party Advisory github.com Third-Party Advisory github.com Third-Party Advisory github.com
Affected: opencast opencast
Published at:
Updated at:

References

Link Tags
https://github.com/opencast/opencast/security/advisories/GHSA-j4mm-7pj3-jf7v exploit third party advisory patch
https://github.com/opencast/opencast/commit/59cb6731067283e54f15462be38b6117d8b9ea8b#diff-9c5fb3d1b7e3b0f54bc5c4182965c4fe1f9023d449017cece3005d3f90e8e4d8 third party advisory patch
https://github.com/opencast/opencast/commit/8f8271e1085f6f8e306c689d6a56b0bb8d076444 third party advisory patch

Frequently Asked Questions

What is the severity of CVE-2021-43807?
CVE-2021-43807 has been scored as a high severity vulnerability.
How to fix CVE-2021-43807?
To fix CVE-2021-43807, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-43807 being actively exploited in the wild?
It is possible that CVE-2021-43807 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2021-43807?
CVE-2021-43807 affects opencast opencast.
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