CVE-2020-2208: Slack uploader Secret Stored Vulnerability

MODERATE
Advisory Identifier: GHSA-656g-hf8v-x2rw
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CVSS 4.3
CWE-522 CWE-256
Published
Advisory Summary

CVE-2020-2208 is a MODERATE (CVSS 4.3) secret stored vulnerability (CWE-522: Insufficiently Protected Credentials) affecting Slack uploader libraries in the Maven ecosystem. The issue involves secret stored in plain text by jenkins slack upload plugin. Remediation is available in the latest vendor maintenance releases.

CVE-2020-2208 at a Glance

CVE Identifier CVE-2020-2208
GHSA Identifier GHSA-656g-hf8v-x2rw
Severity MODERATE
CVSS v3.1 Base Score 4.3
CWE Classification CWE-522: Insufficiently Protected Credentials
Affected Product Slack uploader
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:L/I:N/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 Low (C:L)
Integrity None (I:N)
Availability None (A:N)

How to Fix CVE-2020-2208

To remediate this vulnerability, upgrade all affected Slack uploader 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:slack-uploader fixed: Latest secure release 
<dependency>
    <groupId>org.jenkins-ci.plugins</groupId>
    <artifactId>slack-uploader</artifactId>
    <version>Latest secure release</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-2020-2208, 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 Slack uploader in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than the patched release), 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-522: Insufficiently Protected Credentials, where the product transmits or stores authentication credentials, but it uses an insecure method that is susceptible to unauthorized interception and/or retrieval. In Slack uploader, 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

Jenkins Slack Upload Plugin 1.7 and earlier stores a secret unencrypted in job `config.xml` files on the Jenkins master where it can be viewed by users with Extended Read permission, or access to the master file system.

CVE-2020-2208 Affected Slack uploader Versions

1 component(s)
Product / Package Ecosystem Affected Versions Fixed Version
org.jenkins-ci.plugins:slack-uploader
maven/org.jenkins-ci.plugins/slack-uploader
Maven
≤ 1.7

References

NVD — CVE-2020-2208 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-2208
Slack uploader Source Repository REPOSITORY
https://github.com/jenkinsci/slack-uploader-plugin
Slack uploader Security Information SECURITY
https://jenkins.io/security/advisory/2020-07-02/#SECURITY-1627
Slack uploader Security Information SECURITY
http://www.openwall.com/lists/oss-security/2020/07/02/7

Frequently Asked Questions

What is CVE-2020-2208?
CVE-2020-2208 is a security vulnerability in Slack uploader involving Secret stored in plain text by Jenkins Slack Upload Plugin under CWE-522: Insufficiently Protected Credentials.
Which Slack uploader versions are affected?
Affected versions include releases prior to current release patches across affected packages: org.jenkins-ci.plugins:slack-uploader.
What version fixes CVE-2020-2208?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
Is slack-uploader affected?
Yes, org.jenkins-ci.plugins:slack-uploader is affected in releases prior to Latest secure release. Upgrade your dependency to Latest secure release or later.
What is the CVSS score of CVE-2020-2208?
CVE-2020-2208 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:L/I:N/A:N.
What CWE is associated with CVE-2020-2208?
CVE-2020-2208 is classified under CWE-522: Insufficiently Protected Credentials (The product transmits or stores authentication credentials, but it uses an insecure method that is susceptible to unauthorized interception and/or retrieval.).
How can I check Maven dependencies for CVE-2020-2208?
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-656g-hf8v-x2rw",
  "modified" : "2022-12-29T00:33:11Z",
  "published" : "2022-05-24T17:22:19Z",
  "aliases" : [ "CVE-2020-2208" ],
  "summary" : "Secret stored in plain text by Jenkins Slack Upload Plugin",
  "details" : "Jenkins Slack Upload Plugin 1.7 and earlier stores a secret unencrypted in job `config.xml` files on the Jenkins master where it can be viewed by users with Extended Read permission, or access to the master file system.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.jenkins-ci.plugins:slack-uploader"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "1.7"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-2208"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/jenkinsci/slack-uploader-plugin"
  }, {
    "type" : "WEB",
    "url" : "https://jenkins.io/security/advisory/2020-07-02/#SECURITY-1627"
  }, {
    "type" : "WEB",
    "url" : "http://www.openwall.com/lists/oss-security/2020/07/02/7"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-256", "CWE-522" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2022-12-29T00:33:11Z",
    "nvd_published_at" : "2020-07-02T15:15:00Z"
  }
}