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Mitigation Strategies Analysis for jenkinsci/pipeline-model-definition-plugin

Mitigation Strategy: Pipeline Definition Security (Declarative Pipelines)

Description:

  1. Version Control: Store all Jenkinsfile definitions, which define declarative pipelines using the pipeline-model-definition-plugin, in a version control system like Git.
  2. Code Review Process: Implement a mandatory code review process specifically for Jenkinsfile defining declarative pipelines. This includes reviewing the declarative structure, steps used, and any embedded script blocks.
  3. Branching Strategy: Adopt a branching strategy to manage different versions of declarative pipelines (development, staging, production) defined by Jenkinsfile.

Threats Mitigated:

  • Unauthorized Pipeline Modification (High Severity): Malicious actors could modify declarative pipeline definitions to inject malicious steps or alter the intended workflow.
  • Accidental Pipeline Breakage (Medium Severity): Errors in declarative pipeline syntax or step configuration can lead to broken builds.
  • Lack of Auditability (Medium Severity): Without version control for Jenkinsfile, tracking changes to declarative pipelines becomes difficult.

Impact:

  • Unauthorized Pipeline Modification (High Impact): Significantly reduces risk by controlling changes to declarative pipeline definitions.
  • Accidental Pipeline Breakage (Medium Impact): Reduces risk by introducing review and versioning for declarative pipelines.
  • Lack of Auditability (Medium Impact): Provides audit trail for declarative pipeline changes.

Currently Implemented:

Version control (Git) for Jenkinsfile. Code review partially implemented. Branching strategy in place.

Missing Implementation:

Formalized code review for Jenkinsfile defining declarative pipelines. Consistent enforcement of code review for all declarative pipeline changes.

Mitigation Strategy: Scripted Pipeline Blocks within Declarative Pipelines

Description:

  1. Favor Declarative Syntax: Prioritize using the declarative syntax and built-in steps provided by the pipeline-model-definition-plugin and other Jenkins plugins.
  2. Avoid script Blocks: Actively avoid using script blocks within declarative pipelines unless absolutely necessary and no declarative alternative exists.
  3. Educate Developers: Train developers on the security implications of script blocks in declarative pipelines and promote declarative best practices.

Threats Mitigated:

  • Script Injection Vulnerabilities (High Severity): script blocks introduce Groovy scripting into declarative pipelines, increasing the risk of injection attacks.
  • Unintended Code Execution (Medium Severity): Uncontrolled Groovy code in script blocks can lead to unexpected behavior and security issues within declarative pipelines.
  • Complexity and Maintainability (Medium Severity): Excessive use of script blocks makes declarative pipelines harder to understand and maintain.

Impact:

  • Script Injection Vulnerabilities (High Impact): Significantly reduces risk by limiting the use of script blocks in declarative pipelines.
  • Unintended Code Execution (Medium Impact): Reduces risk by promoting structured declarative pipeline definitions.
  • Complexity and Maintainability (Medium Impact): Improves maintainability of declarative pipelines.

Currently Implemented:

Developers generally encouraged to use declarative syntax. No formal policies in place.

Missing Implementation:

Formal training on declarative pipeline best practices and script block security. Clear guidelines on script block usage in declarative pipelines.

Mitigation Strategy: Strictly Review and Sanitize script Blocks (within Declarative Pipelines)

Description:

  1. Mandatory Code Review for script: Require rigorous code review specifically for any script blocks used within declarative pipelines.
  2. Security Checklist for script: Develop a checklist for reviewers focusing on security aspects of script blocks in declarative pipelines, including input validation, command injection prevention, and least privilege.
  3. Sanitization Functions for script: Provide developers with reusable functions for sanitizing inputs within script blocks in declarative pipelines.

Threats Mitigated:

  • Script Injection Vulnerabilities (High Severity): Addresses injection risks within script blocks in declarative pipelines through review and sanitization.
  • Command Injection Vulnerabilities (High Severity): Specifically mitigates command injection risks within shell commands executed from script blocks in declarative pipelines.
  • Information Disclosure (Medium Severity): Helps prevent information leaks from script blocks in declarative pipelines.

Impact:

  • Script Injection Vulnerabilities (High Impact): Significantly reduces risk through security-focused review of script blocks in declarative pipelines.
  • Command Injection Vulnerabilities (High Impact): Directly mitigates command injection in script blocks within declarative pipelines.
  • Information Disclosure (Medium Impact): Reduces risk of leaks from script blocks in declarative pipelines.

Currently Implemented:

Code reviews are performed, but security-specific review for script blocks in declarative pipelines is not formalized.

Missing Implementation:

Security-focused review checklist for script blocks in declarative pipelines. Reusable sanitization functions for script blocks. Formal training for reviewers.

Mitigation Strategy: Parameter Validation and Sanitization (Declarative Pipelines)

Description:

  1. Declarative Parameter Types: Utilize specific parameter types offered by the pipeline-model-definition-plugin in declarative pipelines (e.g., string, choice, boolean).
  2. Validation Rules for Declarative Parameters: Use validation rules (e.g., regular expressions for string parameters) within declarative pipeline parameter definitions to restrict input.
  3. Sanitization in Declarative Pipelines: Implement or use sanitization functions within declarative pipeline scripts (especially in script blocks if used) to sanitize parameter values before use.

Threats Mitigated:

  • Command Injection Vulnerabilities (High Severity): Prevents command injection via parameters used in declarative pipelines.
  • Script Injection Vulnerabilities (High Severity): Reduces script injection risks from parameters in declarative pipelines.
  • Cross-Site Scripting (XSS) (Medium Severity): Sanitization can help prevent XSS if declarative pipeline output with parameters is displayed in web context.

Impact:

  • Command Injection Vulnerabilities (High Impact): Significantly reduces risk of parameter-based command injection in declarative pipelines.
  • Script Injection Vulnerabilities (High Impact): Reduces risk of script injection via parameters in declarative pipelines.
  • Cross-Site Scripting (XSS) (Medium Impact): Provides defense against XSS in specific declarative pipeline contexts.

Currently Implemented:

Parameter types are used. Basic validation might be implicit. No dedicated sanitization for declarative pipeline parameters.

Missing Implementation:

Systematic parameter validation rules in declarative pipelines. Sanitization functions for declarative pipeline parameters. Developer training on secure parameter handling in declarative pipelines.