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Threat Model Analysis for urfave/cli

Threat: Command Injection Vulnerabilities

  • Threat: Command Injection Vulnerabilities
  • Description:
    • Attacker crafts malicious input for command-line arguments or flags.
    • Application incorrectly uses urfave/cli parsed input to construct and execute external commands via the system shell (e.g., using os/exec with shell execution).
    • Due to lack of proper sanitization of urfave/cli input, attacker can inject arbitrary commands into the executed shell command.
  • Impact:
    • Critical: Full system compromise if the application runs with elevated privileges.
    • High: Data breach, data modification, or data deletion.
    • High: Denial of Service (DoS).
  • CLI Component Affected:
    • Application's logic that constructs and executes external commands (developer-implemented), directly using arguments and flags parsed by urfave/cli (cli.Args, cli.Flags).
  • Risk Severity: Critical to High (if command execution is involved and input from urfave/cli is not properly handled before command construction).
  • Mitigation Strategies:
    • Avoid Shell Execution: Best practice is to use exec.Command with separate arguments, directly passing slices of strings, to avoid shell interpretation of metacharacters. This prevents the shell from processing injected commands.
    • Input Sanitization and Escaping (Avoid if possible): If shell execution is absolutely unavoidable, extremely carefully sanitize and escape user input obtained from urfave/cli before incorporating it into shell commands. This is complex and error-prone, so avoiding shell execution is strongly preferred.
    • Principle of Least Privilege: Run the application with the minimum necessary privileges. Even if command injection occurs, the impact is limited by the application's user privileges.

Threat: Path Traversal Vulnerabilities

  • Threat: Path Traversal Vulnerabilities
  • Description:
    • Attacker provides manipulated file paths as command-line arguments or flags parsed by urfave/cli (e.g., using ../).
    • Application uses these paths, obtained directly from urfave/cli parsing, to access files without proper validation.
    • Due to lack of validation of paths provided via urfave/cli, attacker can access files outside the intended directory or restricted areas.
  • Impact:
    • High: Unauthorized access to sensitive files.
    • High: Information disclosure of potentially critical data.
    • Medium to High: Potential for further exploitation if accessed files contain sensitive data or configuration that can be leveraged for other attacks.
  • CLI Component Affected:
    • Application's logic that handles file paths obtained from urfave/cli arguments or flags (developer-implemented), directly using cli.Args or cli.Flags).
  • Risk Severity: High (if the application handles file paths from urfave/cli input and file access controls are insufficient).
  • Mitigation Strategies:
    • Path Validation and Sanitization:
      • Canonicalization: Immediately after obtaining file paths from urfave/cli, convert them to their canonical form using filepath.Clean (or similar functions in other languages) to resolve symbolic links and remove redundant path separators, mitigating basic traversal attempts.
      • Restrict Access to Allowed Directories: Implement strict checks to ensure that accessed files are within a predefined allowed directory or a set of allowed directories. Verify paths after obtaining them from urfave/cli and before file access, using functions like filepath.Dir and strings.HasPrefix in Go to confirm paths are within allowed boundaries.
    • Principle of Least Privilege (File System): Run the application with minimal file system permissions. Only grant the application access to the directories and files it absolutely needs to function, limiting the scope of potential path traversal exploitation.

Threat: Dependency Vulnerabilities

  • Threat: Dependency Vulnerabilities in urfave/cli and its dependencies
  • Description:
    • urfave/cli library itself or its dependencies contain known security vulnerabilities.
    • Application uses a vulnerable version of urfave/cli or its dependencies.
    • Attacker can exploit these vulnerabilities to directly compromise the application through the urfave/cli library.
  • Impact:
    • Critical: Application compromise, potentially leading to remote code execution if a vulnerability in urfave/cli allows it.
    • High: Denial of Service (DoS) if a vulnerability in urfave/cli can be triggered by specific input or actions.
    • High: Information disclosure if a vulnerability in urfave/cli allows access to sensitive data.
  • CLI Component Affected:
    • urfave/cli library code itself.
    • Dependencies of urfave/cli library.
  • Risk Severity: Varies, can be Critical to High (depending on the specific vulnerability in urfave/cli or its dependencies).
  • Mitigation Strategies:
    • Dependency Management: Use Go modules or a similar dependency management tool to precisely track and manage dependencies, including urfave/cli.
    • Regularly Update Dependencies: Proactively and regularly update urfave/cli and all its dependencies to the latest versions. This is crucial for patching known vulnerabilities.
    • Vulnerability Scanning: Integrate vulnerability scanning tools into your development and CI/CD pipelines to automatically identify known vulnerabilities in urfave/cli and its dependencies.
    • Monitor Security Advisories: Actively monitor security advisories and vulnerability databases specifically for urfave/cli and its Go ecosystem dependencies to stay informed about newly discovered threats and necessary updates.