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.

References

• https://nvd.nist.gov/vuln/detail/CVE-2020-2179
• https://jenkins.io/security/advisory/2020-04-16/#SECURITY-1825
• http://www.openwall.com/lists/oss-security/2020/04/16/4
• jenkinsci/yaml-axis-plugin@3468028