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Threat Model Analysis for yarnpkg/berry

Threat: Compromised PnP Index File

  • Threat: Compromised PnP Index File (.pnp.cjs or .pnp.npm.cjs)
  • Description: An attacker could tamper with the .pnp.cjs file, either by directly modifying it in the repository or by compromising the build pipeline. This allows redirection of dependency resolution to malicious packages.
  • Impact: Arbitrary code execution, data exfiltration, supply chain compromise, denial of service.
  • Affected Berry Component: Plug'n'Play (PnP) Resolver, .pnp.cjs file, Build Process.
  • Risk Severity: Critical
  • Mitigation Strategies:
    • Implement strict access controls for .pnp.cjs.
    • Utilize code signing and verification for build artifacts.
    • Regularly audit build pipeline and CI/CD processes.
    • Employ file integrity monitoring.

Threat: Malicious Packages in Zero-Installs Cache

  • Threat: Malicious Packages in Zero-Installs Cache (.yarn/cache)
  • Description: An attacker could introduce malicious packages into .yarn/cache, either directly or by compromising a developer's machine. With Zero-Installs, these are distributed to all users.
  • Impact: Supply chain compromise, arbitrary code execution, data exfiltration, denial of service.
  • Affected Berry Component: Zero-Installs feature, .yarn/cache directory, Dependency Installation Process.
  • Risk Severity: Critical
  • Mitigation Strategies:
    • Implement pre-commit hooks to scan .yarn/cache.
    • Regularly audit and update dependencies.
    • Use robust code review for changes to .yarn/cache.
    • Employ dependency scanning tools for the cache.

Threat: Bugs in PnP Resolver Logic

  • Threat: Bugs in PnP Resolver Logic
  • Description: Undiscovered bugs in PnP's dependency resolution logic could be exploited to manipulate dependency resolution or introduce malicious packages.
  • Impact: Dependency confusion, arbitrary code execution, denial of service, application instability.
  • Affected Berry Component: Plug'n'Play (PnP) Resolver, Dependency Resolution Algorithm.
  • Risk Severity: High
  • Mitigation Strategies:
    • Stay updated with Yarn Berry releases and security advisories.
    • Thoroughly test applications using PnP.
    • Report suspected bugs to Yarn maintainers.
    • Use PnP-compatible static analysis tools.

Threat: Workspace Isolation Bypass

  • Threat: Workspace Isolation Bypass
  • Description: Vulnerabilities in Yarn Workspaces' isolation could allow bypassing workspace boundaries, enabling access to resources of other workspaces.
  • Impact: Cross-workspace contamination, privilege escalation, information disclosure.
  • Affected Berry Component: Yarn Workspaces, Workspace Isolation Logic, Inter-workspace Communication.
  • Risk Severity: High
  • Mitigation Strategies:
    • Carefully configure workspace dependencies and scripts.
    • Regularly audit workspace configurations.
    • Stay updated with Yarn Berry workspace security advisories.
    • Implement robust access controls within the monorepo.

Threat: Malicious Yarn Plugins

  • Threat: Malicious Yarn Plugins
  • Description: Installing malicious Yarn plugins from untrusted sources can lead to arbitrary code execution in the development environment and build process.
  • Impact: Arbitrary code execution, data exfiltration, supply chain compromise, compromised development environment.
  • Affected Berry Component: Yarn Plugin System, Plugin Installation Mechanism, .yarnrc.yml configuration.
  • Risk Severity: High
  • Mitigation Strategies:
    • Only install plugins from trusted sources.
    • Thoroughly review plugin code before installation.
    • Implement a plugin vetting process.
    • Utilize plugin signing and verification if available.
    • Regularly audit installed plugins.

Threat: Vulnerabilities in Yarn Plugins

  • Threat: Vulnerabilities in Yarn Plugins
  • Description: Legitimate Yarn plugins might contain vulnerabilities that could be exploited to compromise the development environment or build process.
  • Impact: Arbitrary code execution, data exfiltration, denial of service, compromised development environment.
  • Affected Berry Component: Yarn Plugin System, Specific Vulnerable Plugins, Plugin Dependencies.
  • Risk Severity: High
  • Mitigation Strategies:
    • Stay updated with plugin releases and security advisories.
    • Regularly audit and update installed plugins.
    • Use vulnerability scanning tools for plugins.
    • Report plugin vulnerabilities to developers and Yarn maintainers.

Threat: Supply Chain Attacks Targeting Yarn Berry Itself

  • Threat: Supply Chain Attacks Targeting Yarn Berry Itself
  • Description: Compromising Yarn Berry's distribution channels could lead to distribution of malicious Yarn versions, affecting all users.
  • Impact: Widespread supply chain compromise, arbitrary code execution, data exfiltration, denial of service across numerous applications.
  • Affected Berry Component: Yarn Distribution Channels, Yarn Package Registry, Yarn Build Infrastructure, Yarn CLI.
  • Risk Severity: Critical
  • Mitigation Strategies:
    • Use official Yarn distribution channels and verify signatures.
    • Stay updated with Yarn security advisories and update promptly.
    • Monitor Yarn's security posture.
    • Consider dependency pinning and lockfiles for Yarn versions.