CVE-2020-2254: Blueocean Path Traversal Vulnerability

MODERATE
Advisory Identifier: GHSA-vq7j-6pcq-f48p
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CVSS 5.3
CWE-22
Published
Advisory Summary

CVE-2020-2254 is a MODERATE (CVSS 5.3) path traversal vulnerability (CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')) affecting Blueocean libraries in the Maven ecosystem. The issue involves path traversal vulnerability in blue ocean plugin. Remediation is available by upgrading affected packages to version 1.23.3.

CVE-2020-2254 at a Glance

CVE Identifier CVE-2020-2254
GHSA Identifier GHSA-vq7j-6pcq-f48p
Severity MODERATE
CVSS v3.1 Base Score 5.3
CWE Classification CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Affected Product Blueocean
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 5.3

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N).

Attack Vector Network (AV:N)
Attack Complexity High (AC:H)
Privileges Required Low (PR:L)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality High (C:H)
Integrity None (I:N)
Availability None (A:N)

How to Fix CVE-2020-2254

To remediate this vulnerability, upgrade all affected Blueocean dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

io.jenkins.blueocean:blueocean fixed: 1.23.3 
<dependency>
    <groupId>io.jenkins.blueocean</groupId>
    <artifactId>blueocean</artifactId>
    <version>1.23.3</version>
</dependency>
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

mvn dependency:tree -Dincludes=io.jenkins.blueocean

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2020-2254, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree -Dincludes=io.jenkins.blueocean

Analyze the terminal output to locate any version of Blueocean in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.23.3), your application is affected.

Note: The mvn dependency:tree -Dincludes=io.jenkins.blueocean 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 Blueocean, 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

Blue Ocean Plugin 1.23.2 and earlier provides an undocumented feature flag, `blueocean.features.GIT_READ_SAVE_TYPE`, that when set to the value `clone` allows an attacker with Item/Configure or Item/Create permission to read arbitrary files on the Jenkins controller file system. Blue Ocean Plugin 1.23.3 no longer includes this feature and redirects existing usage to a safer alternative.

CVE-2020-2254 Affected Blueocean Versions

1 component(s)
Fixed Versions:
1.23.3
Product / Package Ecosystem Affected Versions Fixed Version
io.jenkins.blueocean:blueocean
maven/io.jenkins.blueocean/blueocean
Maven
< 1.23.3
1.23.3

References

NVD — CVE-2020-2254 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-2254
Security Fix Commit FIX COMMIT
https://github.com/jenkinsci/blueocean-plugin/commit/f0dd4b68d62ac3c3c85012d6eb0c92bcebf85e12
Blueocean Source Repository REPOSITORY
https://github.com/jenkinsci/blueocean-plugin
Blueocean Security Information SECURITY
https://www.jenkins.io/security/advisory/2020-09-16/#SECURITY-1956
Blueocean Security Information SECURITY
http://www.openwall.com/lists/oss-security/2020/09/16/3

Frequently Asked Questions

What is CVE-2020-2254?
CVE-2020-2254 is a security vulnerability in Blueocean involving Path traversal vulnerability in Blue Ocean Plugin under CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal').
Which Blueocean versions are affected?
Affected versions include releases prior to 1.23.3 across affected packages: io.jenkins.blueocean:blueocean.
What version fixes CVE-2020-2254?
Upgrading to 1.23.3 (or the latest patched release for your respective branch) resolves the vulnerability.
Is blueocean affected?
Yes, io.jenkins.blueocean:blueocean is affected in releases prior to 1.23.3. Upgrade your dependency to 1.23.3 or later.
What is the CVSS score of CVE-2020-2254?
CVE-2020-2254 has a CVSS v3.1 base score of 5.3 (MODERATE) with vector string CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N.
What CWE is associated with CVE-2020-2254?
CVE-2020-2254 is classified under CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') (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.).
How can I check Maven dependencies for CVE-2020-2254?
Run the dependency tree command: 'mvn dependency:tree -Dincludes=io.jenkins.blueocean'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-vq7j-6pcq-f48p",
  "modified" : "2022-12-29T01:30:01Z",
  "published" : "2022-05-24T17:28:24Z",
  "aliases" : [ "CVE-2020-2254" ],
  "summary" : "Path traversal vulnerability in Blue Ocean Plugin",
  "details" : "Blue Ocean Plugin 1.23.2 and earlier provides an undocumented feature flag, `blueocean.features.GIT_READ_SAVE_TYPE`, that when set to the value `clone` allows an attacker with Item/Configure or Item/Create permission to read arbitrary files on the Jenkins controller file system.\n\nBlue Ocean Plugin 1.23.3 no longer includes this feature and redirects existing usage to a safer alternative.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "io.jenkins.blueocean:blueocean"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.23.3"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 1.23.2"
    }
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-2254"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/jenkinsci/blueocean-plugin/commit/f0dd4b68d62ac3c3c85012d6eb0c92bcebf85e12"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/jenkinsci/blueocean-plugin"
  }, {
    "type" : "WEB",
    "url" : "https://www.jenkins.io/security/advisory/2020-09-16/#SECURITY-1956"
  }, {
    "type" : "WEB",
    "url" : "http://www.openwall.com/lists/oss-security/2020/09/16/3"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-22" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2022-12-29T01:30:01Z",
    "nvd_published_at" : "2020-09-16T14:15:00Z"
  }
}