CVE-2020-2255: Blueocean Missing Permission Check Vulnerability

MODERATE
Advisory Identifier: GHSA-vc7g-4269-f7hw
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CVSS 4.3
CWE-862
Published
Advisory Summary

CVE-2020-2255 is a MODERATE (CVSS 4.3) missing permission check vulnerability (CWE-862: Missing Authorization) affecting Blueocean libraries in the Maven ecosystem. The issue involves missing permission check in blue ocean plugin. Remediation is available by upgrading affected packages to version 1.23.3.

CVE-2020-2255 at a Glance

CVE Identifier CVE-2020-2255
GHSA Identifier GHSA-vc7g-4269-f7hw
Severity MODERATE
CVSS v3.1 Base Score 4.3
CWE Classification CWE-862: Missing Authorization
Affected Product Blueocean
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 4.3

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:N/I:L/A:N).

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

How to Fix CVE-2020-2255

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-2020-2255, 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-862: Missing Authorization, where the product does not perform an authorization check when an actor attempts to access a resource or perform an action. 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

### Updated 2020-09-16 This entry previously misidentified the problematic behavior. The HTTP request itself is legitimate, but only authorized users should be able to perform it. ### Original Description Blue Ocean Plugin 1.23.2 and earlier does not perform permission checks in several HTTP endpoints implementing connection tests. This allows attackers with Overall/Read permission to connect to an attacker-specified URL. Blue Ocean Plugin 1.23.3 requires Item/Create permission to perform these connection tests.

CVE-2020-2255 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-2020-2255 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-2255
Security Fix Commit FIX COMMIT
https://github.com/jenkinsci/blueocean-plugin/commit/659a66aff0d0ad693eab9d2807985d591e102aab
Blueocean Security Information SECURITY
https://www.jenkins.io/security/advisory/2020-09-16/#SECURITY-1961
Blueocean Security Information SECURITY
http://www.openwall.com/lists/oss-security/2020/09/16/3

Frequently Asked Questions

What is CVE-2020-2255?
CVE-2020-2255 is a security vulnerability in Blueocean involving Missing permission check in Blue Ocean Plugin under CWE-862: Missing Authorization.
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-2020-2255?
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-2020-2255?
CVE-2020-2255 has a CVSS v3.1 base score of 4.3 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N.
What CWE is associated with CVE-2020-2255?
CVE-2020-2255 is classified under CWE-862: Missing Authorization (The product does not perform an authorization check when an actor attempts to access a resource or perform an action.).
How can I check Maven dependencies for CVE-2020-2255?
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-vc7g-4269-f7hw",
  "modified" : "2022-12-29T01:31:52Z",
  "published" : "2022-05-24T17:28:25Z",
  "aliases" : [ "CVE-2020-2255" ],
  "summary" : "Missing permission check in Blue Ocean Plugin",
  "details" : "### Updated 2020-09-16\nThis entry previously misidentified the problematic behavior. The HTTP request itself is legitimate, but only authorized users should be able to perform it.\n\n### Original Description\nBlue Ocean Plugin 1.23.2 and earlier does not perform permission checks in several HTTP endpoints implementing connection tests.\n\nThis allows attackers with Overall/Read permission to connect to an attacker-specified URL.\n\nBlue Ocean Plugin 1.23.3 requires Item/Create permission to perform these connection tests.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/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-2020-2255"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/jenkinsci/blueocean-plugin/commit/659a66aff0d0ad693eab9d2807985d591e102aab"
  }, {
    "type" : "WEB",
    "url" : "https://www.jenkins.io/security/advisory/2020-09-16/#SECURITY-1961"
  }, {
    "type" : "WEB",
    "url" : "http://www.openwall.com/lists/oss-security/2020/09/16/3"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-862" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2022-12-29T01:31:52Z",
    "nvd_published_at" : "2020-09-16T14:15:00Z"
  }
}