Jenkins Security Advisory 2020-04-16

This advisory announces vulnerabilities in the following Jenkins deliverables:

Descriptions

Credentials stored in plain text by Copr Plugin

SECURITY-1556 / CVE-2020-2177

Copr Plugin 0.3 and earlier stores credentials unencrypted in job config.xml files as part of its configuration. These credentials can be viewed by users with Extended Read permission or access to the master file system.

Copr Plugin 0.6.1 stores these credentials encrypted. This change is effective once the job configuration is saved the next time.

XXE vulnerability in Parasoft Findings Plugin

SECURITY-1753 / CVE-2020-2178

Parasoft Findings Plugin implements a static analysis parser for various Parasoft products and integrates with Warnings Plugin (10.4.1 and earlier) and Warnings NG Plugin (10.4.2 and newer).

Parasoft Findings Plugin 10.4.3 and earlier does not configure its XML parser to prevent XML external entity (XXE) attacks. This allows a user able to control the input files for the Parasoft Findings parser to have Jenkins parse a crafted file that uses external entities for extraction of secrets from the Jenkins master or server-side request forgery.

Parasoft Findings Plugin 10.4.4 disables external entity resolution for its XML parser.

RCE vulnerability in Yaml Axis Plugin

SECURITY-1825 / CVE-2020-2179

Yaml Axis Plugin 0.2.0 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 a multi-configuration (Matrix) job, or control the contents of a previously configured job’s SCM repository.

Yaml Axis Plugin 0.2.1 configures its YAML parser to only instantiate safe types.

RCE vulnerability in AWS SAM Plugin

SECURITY-1736 / CVE-2020-2180

AWS SAM Plugin 1.2.2 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 a job or control the contents of a previously configured "AWS SAM deploy application" build step’s YAML SAM template file (template.yaml or equivalent) file.

AWS SAM Plugin 1.2.3 configures its YAML parser to only instantiate safe types.

Severity

Affected Versions

  • AWS SAM Plugin up to and including 1.2.2
  • Copr Plugin up to and including 0.3
  • Parasoft Findings Plugin up to and including 10.4.3
  • Yaml Axis Plugin up to and including 0.2.0

Fix

  • AWS SAM Plugin should be updated to version 1.2.3
  • Copr Plugin should be updated to version 0.6.1
  • Parasoft Findings Plugin should be updated to version 10.4.4
  • Yaml Axis Plugin should be updated to version 0.2.1

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:

  • Federico Pellegrin for SECURITY-1753
  • James Holderness, IB Boost for SECURITY-1556
  • Srikanth Ramu for SECURITY-1825