CVE-2020-2135: Script security Sandbox Bypass Vulnerability Vulnerability

HIGH
Advisory Identifier: GHSA-qvhf-3567-pc4v
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CVSS 8.8
CWE-693 CWE-863
Published
Advisory Summary

CVE-2020-2135 is a HIGH (CVSS 8.8) sandbox bypass vulnerability vulnerability (CWE-693: Protection Mechanism Failure) affecting Script security libraries in the Maven ecosystem. The issue involves sandbox bypass vulnerability in script security plugin. Remediation is available by upgrading affected packages to version 1.71.

CVE-2020-2135 at a Glance

CVE Identifier CVE-2020-2135
GHSA Identifier GHSA-qvhf-3567-pc4v
Severity HIGH
CVSS v3.1 Base Score 8.8
CWE Classification CWE-693: Protection Mechanism Failure
Affected Product Script security
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:3.1/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-2020-2135

To remediate this vulnerability, upgrade all affected Script security 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:script-security fixed: 1.71 
<dependency>
    <groupId>org.jenkins-ci.plugins</groupId>
    <artifactId>script-security</artifactId>
    <version>1.71</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-2020-2135, 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 Script security in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.71), 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-693: Protection Mechanism Failure, where the product does not use or incorrectly uses a protection mechanism that provides sufficient defense against directed attacks against the product. In Script security, 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

Sandbox protection in Script Security Plugin 1.70 and earlier can be circumvented through: - Crafted constructor calls and bodies (due to an incomplete fix of [SECURITY-582](https://www.jenkins.io/security/advisory/2017-08-07/#super-constructor-calls)) - Crafted method calls on objects that implement `GroovyInterceptable` This allows attackers able to specify and run sandboxed scripts to execute arbitrary code in the context of the Jenkins controller JVM. Script Security Plugin 1.71 has additional restrictions and sanity checks to ensure that super constructors cannot be constructed without being intercepted by the sandbox. In addition, it also intercepts method calls on objects that implement `GroovyInterceptable` as calls to `GroovyObject#invokeMethod(String, Object)`, which is on the list of dangerous signatures and should not be approved for use in the sandbox.

CVE-2020-2135 Affected Script security Versions

1 component(s)
Fixed Versions:
1.71
Product / Package Ecosystem Affected Versions Fixed Version
org.jenkins-ci.plugins:script-security
maven/org.jenkins-ci.plugins/script-security
Maven
< 1.71
1.71

References

NVD — CVE-2020-2135 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-2135
Security Fix Commit FIX COMMIT
https://github.com/jenkinsci/script-security-plugin/commit/5b1969e0bdf5cde04a165b847144756b28495788
Script security Source Repository REPOSITORY
https://github.com/jenkinsci/script-security-plugin
Script security Security Information SECURITY
https://jenkins.io/security/advisory/2020-03-09/#SECURITY-1754
Script security Security Information SECURITY
http://www.openwall.com/lists/oss-security/2020/03/09/1

Frequently Asked Questions

What is CVE-2020-2135?
CVE-2020-2135 is a security vulnerability in Script security involving Sandbox bypass vulnerability in Script Security Plugin under CWE-693: Protection Mechanism Failure.
Which Script security versions are affected?
Affected versions include releases prior to 1.71 across affected packages: org.jenkins-ci.plugins:script-security.
What version fixes CVE-2020-2135?
Upgrading to 1.71 (or the latest patched release for your respective branch) resolves the vulnerability.
Is script-security affected?
Yes, org.jenkins-ci.plugins:script-security is affected in releases prior to 1.71. Upgrade your dependency to 1.71 or later.
What is the CVSS score of CVE-2020-2135?
CVE-2020-2135 has a CVSS v3.1 base score of 8.8 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
What CWE is associated with CVE-2020-2135?
CVE-2020-2135 is classified under CWE-693: Protection Mechanism Failure (The product does not use or incorrectly uses a protection mechanism that provides sufficient defense against directed attacks against the product.).
How can I check Maven dependencies for CVE-2020-2135?
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-qvhf-3567-pc4v",
  "modified" : "2025-06-19T14:41:34Z",
  "published" : "2022-05-24T17:10:27Z",
  "aliases" : [ "CVE-2020-2135" ],
  "summary" : "Sandbox bypass vulnerability in Script Security Plugin",
  "details" : "Sandbox protection in Script Security Plugin 1.70 and earlier can be circumvented through:\n- Crafted constructor calls and bodies (due to an incomplete fix of [SECURITY-582](https://www.jenkins.io/security/advisory/2017-08-07/#super-constructor-calls))\n- Crafted method calls on objects that implement `GroovyInterceptable`\n\nThis allows attackers able to specify and run sandboxed scripts to execute arbitrary code in the context of the Jenkins controller JVM.\n\nScript Security Plugin 1.71 has additional restrictions and sanity checks to ensure that super constructors cannot be constructed without being intercepted by the sandbox. In addition, it also intercepts method calls on objects that implement `GroovyInterceptable` as calls to `GroovyObject#invokeMethod(String, Object)`, which is on the list of dangerous signatures and should not be approved for use in the sandbox.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.jenkins-ci.plugins:script-security"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.71"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 1.70"
    }
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-2135"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/jenkinsci/script-security-plugin/commit/5b1969e0bdf5cde04a165b847144756b28495788"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/jenkinsci/script-security-plugin"
  }, {
    "type" : "WEB",
    "url" : "https://jenkins.io/security/advisory/2020-03-09/#SECURITY-1754"
  }, {
    "type" : "WEB",
    "url" : "http://www.openwall.com/lists/oss-security/2020/03/09/1"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-693", "CWE-863" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2023-01-05T20:11:47Z",
    "nvd_published_at" : "2020-03-09T16:15:00Z"
  }
}