7.5

CVSS Score

3.1

-

CVSS Score

Basic Information

CVE ID

CVE-2021-43807

GHSA ID

GHSA-j4mm-7pj3-jf7v

EPSS Score

0.59183%

CWE

CWE-290

Published

12/14/2021

Updated

2/1/2023

KEV Status

Technology

Java

Basic Information

CVE ID

GHSA ID

EPSS Score

CWE

Published

Updated

KEV Status

Technology

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CVE-2021-43807

CVE-2021-43807: HTTP Method Spoofing

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:

Open an issue in our issue tracker
Email us at security@opencast.org

(GitHub Advisory)

Miggo Vulnerability Database

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CVE-2021-43807

CVE-2021-43807:

7.5

CVSS Score

3.1

-

CVSS Score

Basic Information

CVE ID

CVE-2021-43807

GHSA ID

GHSA-j4mm-7pj3-jf7v

EPSS Score

0.59183%

CWE

CWE-290

Published

12/14/2021

Updated

2/1/2023

KEV Status

Technology

Java

Basic Information

CVE ID

GHSA ID

EPSS Score

CWE

Published

Updated

KEV Status

Technology

Technical Details

CVSS Vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

Package Name	Ecosystem	Vulnerable Versions	First Patched Version
org.opencastproject:opencast-common	maven	< 9.10	9.10

Technical Details

Vulnerability Intelligence
Miggo AI

Root Cause Analysis

The vulnerability stems from the use of an outdated Apache CXF dependency (version <3.4.3) that allowed HTTP method spoofing via the '_method' parameter. The patches (commits 59cb673 and 8f8271e) only update the CXF version in 'pom.xml' files, indicating the vulnerability resided in CXF's internal request handling logic, not in Opencast's own code. No specific functions within the 'opencast-common' package were modified or identified as directly implementing the vulnerable behavior. The issue was mitigated by updating the library dependency rather than modifying application code.

Vulnerable functions

Only Mi**o us*rs **n s** t*is s**tion

WAF Protection Rules

WAF Rule

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Reasoning

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7.5

-

Basic Information

Basic Information

Concerned about an active attack path?

CVE-2021-43807: HTTP Method Spoofing

Impact

Patches

Workarounds

References

For more information

CVE-2021-43807:

7.5

-

Basic Information

Basic Information

Technical Details

Technical Details

Vulnerability IntelligenceMiggo AI

Root Cause Analysis

Vulnerable functions

WAF Protection Rules

WAF Rule

Reasoning

Vulnerability IntelligenceMiggo AI

7.5

7.5

Basic Information

Basic Information

Technical Details

CVE-2021-43807: HTTP Method Spoofing

Impact

Patches

Workarounds

References

For more information

Vulnerability IntelligenceMiggo AI

Root Cause Analysis

Vulnerable functions

WAF Protection Rules

WAF Rule

Reasoning

Vulnerability Intelligence
Miggo AI

Vulnerability Intelligence
Miggo AI

Vulnerability Intelligence
Miggo AI