Jenkins Script Security Plugin 1367.vdf2fc45f229c and earlier, except 1365.1367.va3bb89f8a95b and 1362.1364.v4cf2dc5d8776, does not perform a permission check in a method implementing form validation, allowing attackers with Overall/Read permission to check for the existence of files on the controller file system.

In Jenkins Script Security Plugin version 1.36 and earlier, users with the ability to configure sandboxed Groovy scripts are able to use a type coercion feature in Groovy to create new File objects from strings. This allowed reading arbitrary files on the Jenkins master file system. Such a type coercion is now subject to sandbox protection and considered to be a call to the new File(String) constructor for the purpose of in-process script approval.

The default whitelist included the following unsafe entries: DefaultGroovyMethods.putAt(Object, String, Object); DefaultGroovyMethods.getAt(Object, String). These allowed circumventing many of the access restrictions implemented in the script sandbox by using e.g. currentBuild['rawBuild'] rather than currentBuild.rawBuild. Additionally, the following entries allowed accessing private data that would not be accessible otherwise due to script security: groovy.json.JsonOutput.toJson(Closure); groovy.json.JsonOutput.toJson(Object).

A sandbox bypass vulnerability in Jenkins Script Security Plugin 1.62 and earlier related to the handling of subexpressions in increment and decrement expressions not involving actual assignment allowed attackers to execute arbitrary code in sandboxed scripts.

A sandbox bypass vulnerability in Jenkins Script Security Plugin 1.62 and earlier related to the handling of property names in property expressions in increment and decrement expressions allowed attackers to execute arbitrary code in sandboxed scripts.

A sandbox bypass vulnerability in Jenkins Script Security Plugin 1.62 and earlier related to the handling of method names in method call expressions allowed attackers to execute arbitrary code in sandboxed scripts.

A sandbox bypass vulnerability in Jenkins Script Security Plugin 1.62 and earlier related to the handling of property names in property expressions on the left-hand side of assignment expressions allowed attackers to execute arbitrary code in sandboxed scripts.

A vulnerability was found in Jenkins Script Security Plugin 1.72 and earlier does not correctly escape pending or approved classpath entries on the In-process Script Approval page, resulting in a stored cross-site scripting vulnerability.

Reference: http://www.openwall.com/lists/oss-security/2020/06/03/3

A cross-site request forgery (CSRF) vulnerability in Jenkins Script Security Plugin 1158.v7c1b73a69a08 and earlier allows attackers to have Jenkins send an HTTP request to an attacker-specified webserver.