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Sandbox bypass vulnerability in Script Security Plugin

High severity GitHub Reviewed Published May 24, 2022 to the GitHub Advisory Database • Updated Dec 22, 2023

Package

maven org.jenkins-ci.plugins:script-security (Maven)

Affected versions

< 1.7.1

Patched versions

1.7.1

Description

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)
  • 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.

References

Published by the National Vulnerability Database Mar 9, 2020
Published to the GitHub Advisory Database May 24, 2022
Reviewed Jan 14, 2023
Last updated Dec 22, 2023

Severity

High

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS score

0.104%
(44th percentile)

Weaknesses

CVE ID

CVE-2020-2134

GHSA ID

GHSA-gj3q-p8cm-26rm

Source code

Credits

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