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Threat Model Analysis for lewagon/setup

Threat: Upstream Repository Compromise (Supply Chain Attack)

  • Description: An attacker gains control of the lewagon/setup GitHub repository. The attacker injects malicious code into the setup scripts before they are downloaded and executed by the user. This code could do anything from installing backdoors, stealing credentials, to deploying ransomware. This is a direct threat because the user is executing compromised code from the setup process.
    • Impact: Complete system compromise. The attacker could gain full control over the developer's machine. Data theft, system destruction, and lateral movement are all possible.
    • Affected Component: The entire lewagon/setup repository, including all scripts and configuration files within it (e.g., setup.sh, macOS/setup, ubuntu/setup, dotfiles). This is directly the setup scripts.
    • Risk Severity: Critical
    • Mitigation Strategies:
      • Fork and Maintain: Fork the lewagon/setup repository into a private, controlled repository. Thoroughly review all code before merging any upstream changes. This is the most effective mitigation.
      • Pin to Commit Hash: Use a specific, audited commit hash. Regularly review and update the pinned commit after careful inspection. Example: git clone --branch <commit_hash> https://github.com/lewagon/setup.git.
      • Code Review (Difficult but Important): Attempt to review the code of the lewagon/setup repository before each use. Look for obfuscated code, unusual network connections, or modifications to system security settings.
      • Monitor for Security Advisories: Subscribe to security notifications for the repository.
      • Checksum Verification (If Provided): If the repository provides checksums, verify the downloaded files against these checksums before execution. Strongly encourage the maintainers to provide this.

Threat: Man-in-the-Middle (MitM) Attack During Download

  • Description: An attacker intercepts the network traffic between the developer's machine and GitHub during the lewagon/setup download. The attacker modifies the downloaded scripts in transit, injecting malicious code before they are executed. This is a direct threat because the compromised code is executed as part of the setup process.
    • Impact: Complete system compromise, similar to the upstream compromise. Data theft and lateral movement are likely.
    • Affected Component: The downloaded scripts from the lewagon/setup repository (e.g., setup.sh, individual OS-specific scripts). This is directly the setup scripts being downloaded.
    • Risk Severity: High
    • Mitigation Strategies:
      • Checksum Verification (Essential): The lewagon/setup repository must provide checksums (e.g., SHA-256) for the scripts. The user must verify these checksums before executing the scripts. This is the primary defense.
      • VPN Usage: Use a trusted VPN during the setup process, especially on untrusted networks.
      • Trusted Network: Perform the setup on a known, trusted network.
      • Manual Script Inspection: Before running any downloaded script, carefully inspect its contents.

Threat: Unintentional Exposure of Sensitive Information (During Setup)

  • Description: The lewagon/setup scripts themselves, during their execution, might prompt the user for sensitive information (e.g., API keys, passwords) and then store this information insecurely, such as in a plainly readable configuration file or in shell history. This is a direct threat if the script itself handles the sensitive data insecurely.
    • Impact: Credential theft, unauthorized access to services.
    • Affected Component: The lewagon/setup scripts themselves, and any configuration files they directly modify or create during the initial setup process.
    • Risk Severity: High
    • Mitigation Strategies:
      • Script Review: Carefully review the lewagon/setup scripts before running them to identify how they handle sensitive information. Look for any instances where they might be storing credentials insecurely.
      • Avoid Prompts: If the scripts prompt for sensitive information, consider modifying them to use environment variables or a secrets management tool instead.
      • Immediate Remediation: If sensitive information is stored insecurely by the scripts, immediately remove it and rotate the affected credentials.
      • Provide secure input: If the script asks for sensitive information, make sure that the input is not stored in shell history.