Medium severity · published Dec 14, 2021
CVE-2021-43807
Opencast is an Open Source Lecture Capture & Video Management for Education
6.5
CVSS
1.5%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
None
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.5% · higher than 73% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
OP
Opencast · Apereo
before 9.10 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-43807
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-43807
Patch
https://github.com/opencast/opencast/commit/59cb6731067283e54f15462be38b6117d8b9ea8b#diff-9c5fb3d1b7e3b0f54bc5c4182965c4fe1f9023d449017cece3005d3f90e8e4d8
Patch
https://github.com/opencast/opencast/commit/8f8271e1085f6f8e306c689d6a56b0bb8d076444
Exploit
https://github.com/opencast/opencast/security/advisories/GHSA-j4mm-7pj3-jf7v
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