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GHSA-j4mm-7pj3-jf7v

HighCVSS 7.5 / 10
Published Dec 14, 2021·Last modified Mar 13, 2026
Affected Components(1)
Maven logoorg.opencastproject/opencast-common
< 9.10.0
Description

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.

Impact

The vulnerability allows attackers to craft links or forms which may change the server state. For example, the following GET request would create a new user:

% curl -i -u admin:opencast \
  'https://legacy.opencast.org/admin-ng/users/test.json?_method=PUT&username=test&password=attack'
HTTP/2 200
…

If an admin is logged in to legacy.opencast.org and accidentally clicks this link, a user will silently be created.

Patches

This issue is fixed in Opencast 9.10 and 10.0.

Workarounds

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.

References

For more information

If you have any questions or comments about this advisory:

Risk Scores
Base Score
7.5

The vulnerability can be exploited over the network without needing physical access. It is difficult for an attacker to exploit this vulnerability and may require special conditions. An attacker does not need any special privileges or access rights. The attacker needs the user to perform some action, like clicking a link. The impact is confined to the system where the vulnerability exists. There is a high impact on the confidentiality of the information. There is a high impact on the integrity of the data. There is a high impact on the availability of the system.

Threat Intelligence
6.9

Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.

EPSS
N/A

Probability that this vulnerability will be exploited in the wild within the next 30 days.

Exploit
Not available

We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.

Related Vulnerabilities
  • CVE-2021-43807
    Alias
  • EUVD-2021-2538
    Alias

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