CVE-2021-39132: Rundeck core YAML Deserialization Can Run Untrusted Vulnerability
MODERATECVE-2021-39132 is a MODERATE (CVSS 8.8) yaml deserialization can run untrusted vulnerability (CWE-502: Deserialization of Untrusted Data) affecting Rundeck core libraries in the Maven ecosystem. The issue involves yaml deserialization can run untrusted code. Remediation is available by upgrading affected packages to version 3.4.3, 3.3.14.
CVE-2021-39132 at a Glance
Security Impact
CVSS: 8.8
The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H).
How to Fix CVE-2021-39132
To remediate this vulnerability, upgrade all affected Rundeck core 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.rundeck</groupId>
<artifactId>rundeck-core</artifactId>
<version>3.4.3</version>
</dependency><dependency>
<groupId>org.rundeck</groupId>
<artifactId>rundeck-core</artifactId>
<version>3.3.14</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.rundeckHow to Check if You Are Affected
To determine whether your Java application is affected by CVE-2021-39132, inspect your build dependencies using the Maven Dependency Plugin:
mvn dependency:tree -Dincludes=org.rundeckAnalyze the terminal output to locate any version of Rundeck core in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 3.4.3), your application is affected.
Note: The mvn dependency:tree -Dincludes=org.rundeck 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-502: Deserialization of Untrusted Data, where the product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid. In Rundeck core, 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-2021-39132 Affected Rundeck core Versions
2 component(s)| Product / Package | Ecosystem | Affected Versions | Fixed Version |
|---|---|---|---|
|
org.rundeck:rundeck-core
|
Maven |
≥ 3.4.0
< 3.4.3
|
3.4.3
|
|
org.rundeck:rundeck-core
|
Maven |
< 3.3.14
|
3.3.14
|
References
Frequently Asked Questions
What is CVE-2021-39132?
Which Rundeck core versions are affected?
What version fixes CVE-2021-39132?
Is rundeck-core affected?
What is the CVSS score of CVE-2021-39132?
What CWE is associated with CVE-2021-39132?
How can I check Maven dependencies for CVE-2021-39132?
Machine-readable OSV JSON
OSV v1.5 Schema
{
"schema_version" : "1.4.0",
"id" : "GHSA-q4rf-3fhx-88pf",
"modified" : "2021-08-30T22:03:16Z",
"published" : "2021-09-01T18:27:01Z",
"aliases" : [ "CVE-2021-39132" ],
"summary" : "YAML deserialization can run untrusted code",
"details" : "### Impact\n\nAn authorized user can upload a zip-format plugin with a crafted plugin.yaml, or a crafted aclpolicy yaml file, or upload an untrusted project archive with a crafted aclpolicy yaml file, that can cause the server to run untrusted code on Rundeck Community or Enterprise Edition. An authenticated user can make a POST request, that can cause the server to run untrusted code on Rundeck Enterprise Edition.\n\nThe zip-format plugin issues requires authentication and authorization to these access levels, and affects all Rundeck editions:\n\n* `admin` level access to the `system` resource type\n\nThe ACL Policy yaml file upload issues requires authentication and authorization to these access levels, and affects all Rundeck editions: \n\n* `create` `update` or `admin` level access to a `project_acl` resource\n* `create` `update` or `admin` level access to the `system_acl` resource\n\nThe unauthorized POST request requires authentication, but no specific authorization, and affects Rundeck Enterprise only.\n\n### Patches\nVersions 3.4.3, 3.3.14\n\n### Workarounds\n\nPlease visit [https://rundeck.com/security](https://rundeck.com/security) for information about specific workarounds.\n\n### For more information\nIf you have any questions or comments about this advisory:\n* Email us at [security@rundeck.com](mailto:security@rundeck.com)\n\nTo report security issues to Rundeck please use the form at [https://rundeck.com/security](https://rundeck.com/security)\n\nReporter: Rojan Rijal from Tinder Red Team",
"severity" : [ {
"type" : "CVSS_V3",
"score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
} ],
"affected" : [ {
"package" : {
"ecosystem" : "Maven",
"name" : "org.rundeck:rundeck-core"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "3.4.0"
}, {
"fixed" : "3.4.3"
} ]
} ]
}, {
"package" : {
"ecosystem" : "Maven",
"name" : "org.rundeck:rundeck-core"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "0"
}, {
"fixed" : "3.3.14"
} ]
} ]
} ],
"references" : [ {
"type" : "WEB",
"url" : "https://github.com/rundeck/rundeck/security/advisories/GHSA-q4rf-3fhx-88pf"
}, {
"type" : "ADVISORY",
"url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-39132"
}, {
"type" : "WEB",
"url" : "https://github.com/rundeck/rundeck/commit/850d12e21d22833bc148b7f458d7cb5949f829b6"
}, {
"type" : "PACKAGE",
"url" : "https://github.com/rundeck/rundeck"
} ],
"database_specific" : {
"cwe_ids" : [ "CWE-502" ],
"severity" : "MODERATE",
"github_reviewed" : true,
"github_reviewed_at" : "2021-08-30T22:03:16Z",
"nvd_published_at" : "2021-08-30T20:15:00Z"
}
}