Builds in Jenkins are associated with an authentication that controls the permissions that the build has to interact with other elements in Jenkins. The Pipeline: Build Step Plugin did not check the build authentication it was running as and allowed triggering any other project in Jenkins.
Weakness
During installation, installed file permissions are set to allow anyone to modify those files.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Pipeline:_build_step | Jenkins | * | 2.5 (including) |
| Red Hat OpenShift Container Platform 3.6 | RedHat | atomic-openshift-0:3.6.173.0.21-1.git.0.f95b0e7.el7 | * |
| Red Hat OpenShift Container Platform 3.6 | RedHat | fluentd-0:0.12.39-2.el7 | * |
| Red Hat OpenShift Container Platform 3.6 | RedHat | jenkins-2-plugins-0:3.7.1502412812-1.el7 | * |
| Red Hat OpenShift Container Platform 3.6 | RedHat | kibana-0:4.6.4-3.el7 | * |
| Red Hat OpenShift Container Platform 3.6 | RedHat | rubygem-cool.io-0:1.5.1-1.el7 | * |
| Red Hat OpenShift Container Platform 3.6 | RedHat | rubygem-excon-0:0.58.0-1.el7 | * |
| Red Hat OpenShift Container Platform 3.6 | RedHat | rubygem-faraday-0:0.13.0-1.el7 | * |
| Red Hat OpenShift Container Platform 3.6 | RedHat | rubygem-fluent-plugin-kubernetes_metadata_filter-0:0.29.0-1.el7 | * |
| Red Hat OpenShift Container Platform 3.6 | RedHat | rubygem-fluent-plugin-viaq_data_model-0:0.0.5-1.el7 | * |
| Red Hat OpenShift Container Platform 3.6 | RedHat | rubygem-i18n-0:0.8.6-1.el7 | * |
| Red Hat OpenShift Container Platform 3.6 | RedHat | rubygem-systemd-journal-0:1.3.0-1.el7 | * |
Potential Mitigations
- Compartmentalize the system to have “safe” areas where trust boundaries can be unambiguously drawn. Do not allow sensitive data to go outside of the trust boundary and always be careful when interfacing with a compartment outside of the safe area.
- Ensure that appropriate compartmentalization is built into the system design, and the compartmentalization allows for and reinforces privilege separation functionality. Architects and designers should rely on the principle of least privilege to decide the appropriate time to use privileges and the time to drop privileges.
Related Attack Patterns
- https://cwe.mitre.org/data/definitions/1.html
- https://cwe.mitre.org/data/definitions/127.html
- https://cwe.mitre.org/data/definitions/81.html