CVE-2020-2189: Scm filter jervis Remote Code Execution Vulnerability

HIGH
Advisory Identifier: GHSA-4hhq-j3xw-wj89
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CVSS 8.8
CWE-502
Published
Advisory Summary

CVE-2020-2189 is a HIGH (CVSS 8.8) remote code execution vulnerability (CWE-502: Deserialization of Untrusted Data) affecting Scm filter jervis libraries in the Maven ecosystem. The issue involves rce vulnerability in scm filter jervis plugin. Remediation is available by upgrading affected packages to version 0.3.

CVE-2020-2189 at a Glance

CVE Identifier CVE-2020-2189
GHSA Identifier GHSA-4hhq-j3xw-wj89
Severity HIGH
CVSS v3.1 Base Score 8.8
CWE Classification CWE-502: Deserialization of Untrusted Data
Affected Product Scm filter jervis
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 8.8

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H).

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 High (C:H)
Integrity High (I:H)
Availability High (A:H)

How to Fix CVE-2020-2189

To remediate this vulnerability, upgrade all affected Scm filter jervis 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.plugins:scm-filter-jervis fixed: 0.3 
<dependency>
    <groupId>io.jenkins.plugins</groupId>
    <artifactId>scm-filter-jervis</artifactId>
    <version>0.3</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.plugins

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2020-2189, inspect your build dependencies using the Maven Dependency Plugin:

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

Analyze the terminal output to locate any version of Scm filter jervis in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.3), your application is affected.

Note: The mvn dependency:tree -Dincludes=io.jenkins.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-502: Deserialization of Untrusted Data, where the product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid. In Scm filter jervis, 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

SCM Filter Jervis Plugin 0.2.1 and earlier does not configure its YAML parser to prevent the instantiation of arbitrary types. This results in a remote code execution (RCE) vulnerability exploitable by users able to configure jobs with the filter, or control the contents of a previously configured job’s SCM repository. SCM Filter Jervis Plugin 0.3 configures its YAML parser to only instantiate safe types.

CVE-2020-2189 Affected Scm filter jervis Versions

1 component(s)
Fixed Versions:
0.3
Product / Package Ecosystem Affected Versions Fixed Version
io.jenkins.plugins:scm-filter-jervis
maven/io.jenkins.plugins/scm-filter-jervis
Maven
< 0.3
0.3

References

NVD — CVE-2020-2189 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-2189
Security Fix Commit FIX COMMIT
https://github.com/jenkinsci/scm-filter-jervis-plugin/commit/a36e8bdef3a2a84737b64a898da4106793997273
Scm filter jervis Source Repository REPOSITORY
https://github.com/jenkinsci/scm-filter-jervis-plugin
Scm filter jervis Security Information SECURITY
https://jenkins.io/security/advisory/2020-05-06/#SECURITY-1826
Scm filter jervis Security Information SECURITY
http://www.openwall.com/lists/oss-security/2020/05/06/3

Frequently Asked Questions

What is CVE-2020-2189?
CVE-2020-2189 is a security vulnerability in Scm filter jervis involving RCE vulnerability in SCM Filter Jervis Plugin under CWE-502: Deserialization of Untrusted Data.
Which Scm filter jervis versions are affected?
Affected versions include releases prior to 0.3 across affected packages: io.jenkins.plugins:scm-filter-jervis.
What version fixes CVE-2020-2189?
Upgrading to 0.3 (or the latest patched release for your respective branch) resolves the vulnerability.
Is scm-filter-jervis affected?
Yes, io.jenkins.plugins:scm-filter-jervis is affected in releases prior to 0.3. Upgrade your dependency to 0.3 or later.
What is the CVSS score of CVE-2020-2189?
CVE-2020-2189 has a CVSS v3.1 base score of 8.8 (HIGH) with vector string CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
What CWE is associated with CVE-2020-2189?
CVE-2020-2189 is classified under CWE-502: Deserialization of Untrusted Data (The product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid.).
How can I check Maven dependencies for CVE-2020-2189?
Run the dependency tree command: 'mvn dependency:tree -Dincludes=io.jenkins.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-4hhq-j3xw-wj89",
  "modified" : "2023-12-07T21:38:51Z",
  "published" : "2022-05-24T17:17:14Z",
  "aliases" : [ "CVE-2020-2189" ],
  "summary" : "RCE vulnerability in SCM Filter Jervis Plugin",
  "details" : "SCM Filter Jervis Plugin 0.2.1 and earlier does not configure its YAML parser to prevent the instantiation of arbitrary types. This results in a remote code execution (RCE) vulnerability exploitable by users able to configure jobs with the filter, or control the contents of a previously configured job’s SCM repository.\n\nSCM Filter Jervis Plugin 0.3 configures its YAML parser to only instantiate safe types.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "io.jenkins.plugins:scm-filter-jervis"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.3"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 0.2.1"
    }
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-2189"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/jenkinsci/scm-filter-jervis-plugin/commit/a36e8bdef3a2a84737b64a898da4106793997273"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/jenkinsci/scm-filter-jervis-plugin"
  }, {
    "type" : "WEB",
    "url" : "https://jenkins.io/security/advisory/2020-05-06/#SECURITY-1826"
  }, {
    "type" : "WEB",
    "url" : "http://www.openwall.com/lists/oss-security/2020/05/06/3"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-502" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2022-12-16T22:48:17Z",
    "nvd_published_at" : "2020-05-06T13:15:00Z"
  }
}