CVE-2021-21683: Jenkins core Path Traversal Vulnerability
MODERATECVE-2021-21683 is a MODERATE (CVSS 6.5) path traversal vulnerability (CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')) affecting Jenkins core libraries in the Maven ecosystem. The issue involves path traversal vulnerability on windows in jenkins. Remediation is available by upgrading affected packages to version 2.303.2, 2.315.
CVE-2021-21683 at a Glance
Security Impact
CVSS: 6.5
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:N/A:N).
How to Fix CVE-2021-21683
To remediate this vulnerability, upgrade all affected Jenkins 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.jenkins-ci.main</groupId>
<artifactId>jenkins-core</artifactId>
<version>2.303.2</version>
</dependency><dependency>
<groupId>org.jenkins-ci.main</groupId>
<artifactId>jenkins-core</artifactId>
<version>2.315</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.jenkins-ci.mainHow to Check if You Are Affected
To determine whether your Java application is affected by CVE-2021-21683, inspect your build dependencies using the Maven Dependency Plugin:
mvn dependency:tree -Dincludes=org.jenkins-ci.mainAnalyze the terminal output to locate any version of Jenkins core in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 2.303.2), your application is affected.
Note: The mvn dependency:tree -Dincludes=org.jenkins-ci.main 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-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal'), where the product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. In Jenkins 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-2021-21683 Affected Jenkins core Versions
2 component(s)| Product / Package | Ecosystem | Affected Versions | Fixed Version |
|---|---|---|---|
|
org.jenkins-ci.main:jenkins-core
|
Maven |
< 2.303.2
|
2.303.2
|
|
org.jenkins-ci.main:jenkins-core
|
Maven |
≥ 2.304
< 2.315
|
2.315
|
References
Frequently Asked Questions
What is CVE-2021-21683?
Which Jenkins core versions are affected?
What version fixes CVE-2021-21683?
Is jenkins-core affected?
What is the CVSS score of CVE-2021-21683?
What CWE is associated with CVE-2021-21683?
How can I check Maven dependencies for CVE-2021-21683?
Machine-readable OSV JSON
OSV v1.5 Schema
{
"schema_version" : "1.4.0",
"id" : "GHSA-4pw5-r58h-fv24",
"modified" : "2022-12-15T17:37:38Z",
"published" : "2022-05-24T19:16:59Z",
"aliases" : [ "CVE-2021-21683" ],
"summary" : "Path traversal vulnerability on Windows in Jenkins",
"details" : "The file browser for workspaces, archived artifacts, and `userContent/` in Jenkins 2.314 and earlier, LTS 2.303.1 and earlier may interpret some paths to files as absolute on Windows.\n\nThis results in a path traversal vulnerability allowing attackers with Overall/Read permission (Windows controller) or Job/Workspace permission (Windows agents) to obtain the contents of arbitrary files.\\n\\nThe file browser in Jenkins 2.315, LTS 2.303.2 refuses to serve files that would be considered absolute paths.",
"severity" : [ {
"type" : "CVSS_V3",
"score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N"
} ],
"affected" : [ {
"package" : {
"ecosystem" : "Maven",
"name" : "org.jenkins-ci.main:jenkins-core"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "0"
}, {
"fixed" : "2.303.2"
} ]
} ],
"database_specific" : {
"last_known_affected_version_range" : "<= 2.303.1"
}
}, {
"package" : {
"ecosystem" : "Maven",
"name" : "org.jenkins-ci.main:jenkins-core"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "2.304"
}, {
"fixed" : "2.315"
} ]
} ],
"database_specific" : {
"last_known_affected_version_range" : "<= 2.314"
}
} ],
"references" : [ {
"type" : "ADVISORY",
"url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-21683"
}, {
"type" : "WEB",
"url" : "https://github.com/jenkinsci/jenkins/commit/3f679fc12d073676a4441d3fa8b5fff34c07662f"
}, {
"type" : "PACKAGE",
"url" : "https://github.com/jenkinsci/jenkins"
}, {
"type" : "WEB",
"url" : "https://www.jenkins.io/security/advisory/2021-10-06/#SECURITY-2481"
}, {
"type" : "WEB",
"url" : "http://www.openwall.com/lists/oss-security/2021/10/06/1"
} ],
"database_specific" : {
"cwe_ids" : [ "CWE-22" ],
"severity" : "MODERATE",
"github_reviewed" : true,
"github_reviewed_at" : "2022-12-15T17:37:38Z",
"nvd_published_at" : "2021-10-06T23:15:00Z"
}
}