ESB-2019.0074 - [Win][UNIX/Linux] Jenkins plugins: Execute arbitrary code/commands - Existing account 2019-01-09

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2019.0074
                         Jenkins Security Advisory
                              9 January 2019

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           Jenkins plugins
Publisher:         Jenkins
Operating System:  Windows
                   UNIX variants (UNIX, Linux, OSX)
Impact/Access:     Execute Arbitrary Code/Commands -- Existing Account
Resolution:        Patch/Upgrade

Original Bulletin: 
   https://jenkins.io/security/advisory/2019-01-08/

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Jenkins Security Advisory 2019-01-08

This advisory announces vulnerabilities in the following Jenkins deliverables:

  o Pipeline: Declarative Plugin
  o Pipeline: Groovy Plugin
  o Script Security Plugin

Descriptions

Sandbox Bypass in Script Security and Pipeline Plugins

SECURITY-1266 / CVE pending

Script Security sandbox protection could be circumvented during the script
compilation phase by applying AST transforming annotations such as @Grab to
source code elements.

Both the pipeline validation REST APIs and actual script/pipeline execution are
affected.

This allowed users with Overall/Read permission, or able to control Jenkinsfile
or sandboxed Pipeline shared library contents in SCM, to bypass the sandbox
protection and execute arbitrary code on the Jenkins master.

All known unsafe AST transformations in Groovy are now prohibited in sandboxed
scripts.

Severity

  o SECURITY-1266: High

Affected Versions

  o Pipeline: Declarative Plugin up to and including 1.3.4
  o Pipeline: Groovy Plugin up to and including 2.61
  o Script Security Plugin up to and including 1.49

Fix

  o Pipeline: Declarative Plugin should be updated to version 1.3.4.1
  o Pipeline: Groovy Plugin should be updated to version 2.61.1
  o Script Security Plugin should be updated to version 1.50

These versions include fixes to the vulnerabilities described above. All prior
versions are considered to be affected by these vulnerabilities unless
otherwise indicated.

Credit

The Jenkins project would like to thank the reporters for discovering and
reporting these vulnerabilities:

  o Orange Tsai(@orange_8361) from DEVCORE for SECURITY-1266

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