CVE-2021-43807: Opencast common HTTP Method Spoofing Vulnerability
HIGHCVE-2021-43807 is a HIGH (CVSS 7.5) http method spoofing vulnerability (CWE-290: Authentication Bypass by Spoofing) affecting Opencast common libraries in the Maven ecosystem. The issue involves http method spoofing. Remediation is available by upgrading affected packages to version 9.10.
CVE-2021-43807 at a Glance
Security Impact
CVSS: 7.5
The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H).
How to Fix CVE-2021-43807
To remediate this vulnerability, upgrade all affected Opencast common dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.
<dependency>
<groupId>org.opencastproject</groupId>
<artifactId>opencast-common</artifactId>
<version>9.10</version>
</dependency>Run the following command in your project directory to verify that all resolved dependencies use the patched release:
mvn dependency:tree -Dincludes=org.opencastprojectHow to Check if You Are Affected
To determine whether your Java application is affected by CVE-2021-43807, inspect your build dependencies using the Maven Dependency Plugin:
mvn dependency:tree -Dincludes=org.opencastprojectAnalyze the terminal output to locate any version of Opencast common in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 9.10), your application is affected.
Note: The mvn dependency:tree -Dincludes=org.opencastproject command inspects the resolved dependency graph declared in your project's POM files; it does not perform automated security scanning or inspect runtime dynamic classpaths. Always verify runtime container classpaths and shaded JARs.
Technical Details
Vulnerability Mechanism & Technical Analysis
This vulnerability is classified under CWE-290: Authentication Bypass by Spoofing, where this attack-focused weakness is caused by incorrectly implemented authentication schemes that are subject to spoofing attacks. In Opencast common, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.
Source Advisory Statement
CVE-2021-43807 Affected Opencast common Versions
1 component(s)| Product / Package | Ecosystem | Affected Versions | Fixed Version |
|---|---|---|---|
|
org.opencastproject:opencast-common
|
Maven |
< 9.10
|
9.10
|
References
Frequently Asked Questions
What is CVE-2021-43807?
Which Opencast common versions are affected?
What version fixes CVE-2021-43807?
Is opencast-common affected?
What is the CVSS score of CVE-2021-43807?
What CWE is associated with CVE-2021-43807?
How can I check Maven dependencies for CVE-2021-43807?
Machine-readable OSV JSON
OSV v1.5 Schema
{
"schema_version" : "1.4.0",
"id" : "GHSA-j4mm-7pj3-jf7v",
"modified" : "2022-01-04T18:54:12Z",
"published" : "2021-12-14T21:43:00Z",
"aliases" : [ "CVE-2021-43807" ],
"summary" : "HTTP Method Spoofing",
"details" : "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.\n\n### Impact\n\nThe 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:\n\n```sh\n% curl -i -u admin:opencast \\\n 'https://legacy.opencast.org/admin-ng/users/test.json?_method=PUT&username=test&password=attack'\nHTTP/2 200\n…\n```\n\nIf an admin is logged in to legacy.opencast.org and accidentally clicks this link, a user will silently be created.\n\n\n### Patches\n\nThis issue is fixed in Opencast 9.10 and 10.0.\n\n### Workarounds\n\nYou 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.\n\n### References\n\n- [Fix for 10.0](https://github.com/opencast/opencast/commit/59cb6731067283e54f15462be38b6117d8b9ea8b#diff-9c5fb3d1b7e3b0f54bc5c4182965c4fe1f9023d449017cece3005d3f90e8e4d8)\n- [Fix for 9.10](https://github.com/opencast/opencast/commit/8f8271e1085f6f8e306c689d6a56b0bb8d076444)\n\n### For more information\n\nIf you have any questions or comments about this advisory:\n* Open an issue in [our issue tracker](https://github.com/opencast/opencast/issues)\n* Email us at [security@opencast.org](mailto:security@opencast.org)\n",
"severity" : [ {
"type" : "CVSS_V3",
"score" : "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H"
} ],
"affected" : [ {
"package" : {
"ecosystem" : "Maven",
"name" : "org.opencastproject:opencast-common"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "0"
}, {
"fixed" : "9.10"
} ]
} ]
} ],
"references" : [ {
"type" : "WEB",
"url" : "https://github.com/opencast/opencast/security/advisories/GHSA-j4mm-7pj3-jf7v"
}, {
"type" : "ADVISORY",
"url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-43807"
}, {
"type" : "WEB",
"url" : "https://github.com/opencast/opencast/commit/59cb6731067283e54f15462be38b6117d8b9ea8b#diff-9c5fb3d1b7e3b0f54bc5c4182965c4fe1f9023d449017cece3005d3f90e8e4d8"
}, {
"type" : "WEB",
"url" : "https://github.com/opencast/opencast/commit/8f8271e1085f6f8e306c689d6a56b0bb8d076444"
}, {
"type" : "PACKAGE",
"url" : "https://github.com/opencast/opencast"
} ],
"database_specific" : {
"cwe_ids" : [ "CWE-290" ],
"severity" : "HIGH",
"github_reviewed" : true,
"github_reviewed_at" : "2021-12-14T18:49:26Z",
"nvd_published_at" : "2021-12-14T18:15:00Z"
}
}