CVE-2020-2093: Cloudbees jenkins advisor CSRF Vulnerability Vulnerability

MODERATE
Advisory Identifier: GHSA-fc92-8r77-9297
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CVSS 5.0
CWE-352
Published
Advisory Summary

CVE-2020-2093 is a MODERATE (CVSS 5.0) csrf vulnerability vulnerability (CWE-352: Cross-Site Request Forgery (CSRF)) affecting Cloudbees jenkins advisor libraries in the Maven ecosystem. The issue involves csrf vulnerability in health advisor by cloudbees plugin. Remediation is available by upgrading affected packages to version 3.0.1.

CVE-2020-2093 at a Glance

CVE Identifier CVE-2020-2093
GHSA Identifier GHSA-fc92-8r77-9297
Severity MODERATE
CVSS v3.1 Base Score 5.0
CWE Classification CWE-352: Cross-Site Request Forgery (CSRF)
Affected Product Cloudbees jenkins advisor
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 5.0

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:C/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 Changed (S:C)
Confidentiality None (C:N)
Integrity Low (I:L)
Availability None (A:N)

How to Fix CVE-2020-2093

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

org.jenkins-ci.plugins:cloudbees-jenkins-advisor fixed: 3.0.1 
<dependency>
    <groupId>org.jenkins-ci.plugins</groupId>
    <artifactId>cloudbees-jenkins-advisor</artifactId>
    <version>3.0.1</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=org.jenkins-ci.plugins

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2020-2093, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree -Dincludes=org.jenkins-ci.plugins

Analyze the terminal output to locate any version of Cloudbees jenkins advisor in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 3.0.1), your application is affected.

Note: The mvn dependency:tree -Dincludes=org.jenkins-ci.plugins 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-352: Cross-Site Request Forgery (CSRF), where the web application does not, or cannot, sufficiently verify whether a request was intentionally provided by the user who sent the request, which could have originated from an unauthorized actor. In Cloudbees jenkins advisor, 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

Health Advisor by CloudBees Plugin 3.0 and earlier does not perform permission checks in methods performing form validation. This allows users with Overall/Read access to send an email with fixed content to an attacker-specified recipient. Additionally, these form validation methods do not require POST requests, resulting in a CSRF vulnerability. Health Advisor by CloudBees Plugin 3.0.1 requires POST requests and Overall/Administer permission for the affected form validation methods.

CVE-2020-2093 Affected Cloudbees jenkins advisor Versions

1 component(s)
Fixed Versions:
3.0.1
Product / Package Ecosystem Affected Versions Fixed Version
org.jenkins-ci.plugins:cloudbees-jenkins-advisor
maven/org.jenkins-ci.plugins/cloudbees-jenkins-advisor
Maven
< 3.0.1
3.0.1

References

NVD — CVE-2020-2093 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-2093
Security Fix Commit FIX COMMIT
https://github.com/jenkinsci/cloudbees-jenkins-advisor-plugin/commit/f53fe8a41a1566fdd7d2996779f6c5684ef3e2df
Cloudbees jenkins advisor Source Repository REPOSITORY
https://github.com/jenkinsci/cloudbees-jenkins-advisor-plugin
Cloudbees jenkins advisor Security Information SECURITY
https://jenkins.io/security/advisory/2020-01-15/#SECURITY-1708

Frequently Asked Questions

What is CVE-2020-2093?
CVE-2020-2093 is a security vulnerability in Cloudbees jenkins advisor involving CSRF vulnerability in Health Advisor by CloudBees Plugin under CWE-352: Cross-Site Request Forgery (CSRF).
Which Cloudbees jenkins advisor versions are affected?
Affected versions include releases prior to 3.0.1 across affected packages: org.jenkins-ci.plugins:cloudbees-jenkins-advisor.
What version fixes CVE-2020-2093?
Upgrading to 3.0.1 (or the latest patched release for your respective branch) resolves the vulnerability.
Is cloudbees-jenkins-advisor affected?
Yes, org.jenkins-ci.plugins:cloudbees-jenkins-advisor is affected in releases prior to 3.0.1. Upgrade your dependency to 3.0.1 or later.
What is the CVSS score of CVE-2020-2093?
CVE-2020-2093 has a CVSS v3.1 base score of 5.0 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:N.
What CWE is associated with CVE-2020-2093?
CVE-2020-2093 is classified under CWE-352: Cross-Site Request Forgery (CSRF) (The web application does not, or cannot, sufficiently verify whether a request was intentionally provided by the user who sent the request, which could have originated from an unauthorized actor.).
How can I check Maven dependencies for CVE-2020-2093?
Run the dependency tree command: 'mvn dependency:tree -Dincludes=org.jenkins-ci.plugins'. 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-fc92-8r77-9297",
  "modified" : "2022-12-21T16:42:45Z",
  "published" : "2022-05-24T17:06:22Z",
  "aliases" : [ "CVE-2020-2093" ],
  "summary" : "CSRF vulnerability in Health Advisor by CloudBees Plugin",
  "details" : "Health Advisor by CloudBees Plugin 3.0 and earlier does not perform permission checks in methods performing form validation. This allows users with Overall/Read access to send an email with fixed content to an attacker-specified recipient.\n\nAdditionally, these form validation methods do not require POST requests, resulting in a CSRF vulnerability.\n\nHealth Advisor by CloudBees Plugin 3.0.1 requires POST requests and Overall/Administer permission for the affected form validation methods.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.jenkins-ci.plugins:cloudbees-jenkins-advisor"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "3.0.1"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-2093"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/jenkinsci/cloudbees-jenkins-advisor-plugin/commit/f53fe8a41a1566fdd7d2996779f6c5684ef3e2df"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/jenkinsci/cloudbees-jenkins-advisor-plugin"
  }, {
    "type" : "WEB",
    "url" : "https://jenkins.io/security/advisory/2020-01-15/#SECURITY-1708"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-352" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2022-12-21T16:42:45Z",
    "nvd_published_at" : "2020-01-15T16:15:00Z"
  }
}