Description

Prior to 3385, the user-controlled role parameter enters the application in the Kubernetes::RoleVerificationsController. The role parameter flows into the RoleConfigFile initializer and then into the Kubernetes::Util.parse_file method where it is unsafely deserialized using the YAML.load_stream method. This issue may lead to Remote Code Execution (RCE). This vulnerability is fixed in 3385.

References

https://securitylab.github.com/advisories/GHSL-2023-136_Samson/

https://github.com/zendesk/samson/pull/4071

https://github.com/zendesk/samson/blob/107efb4a252425966aac5e77d0c3670f9b5d7229/plugins/kubernetes/app/controllers/kubernetes/role_verifications_controller.rb#L10

https://github.com/zendesk/samson/blob/107efb4a252425966aac5e77d0c3670f9b5d7229/plugins/kubernetes/app/controllers/kubernetes/role_verifications_controller.rb#L7

https://github.com/zendesk/samson/blob/107efb4a252425966aac5e77d0c3670f9b5d7229/plugins/kubernetes/app/models/kubernetes/role_config_file.rb#L80

https://github.com/zendesk/samson/blob/107efb4a252425966aac5e77d0c3670f9b5d7229/plugins/kubernetes/app/models/kubernetes/util.rb#L9

For More Information

CVERecord