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Threat Model Analysis for iamkun/dayjs

Threat: Malicious Date String Parsing (DoS)

  • Threat: Malicious Date String Parsing (DoS)

    • Description: An attacker submits an extremely long, complex, or specially crafted date/time string to a dayjs parsing function. The attacker aims to cause excessive CPU consumption, leading to a denial-of-service condition by exhausting server resources. This could involve deeply nested date components, unusual formats, or exploiting known parsing vulnerabilities.
    • Impact: Application becomes unresponsive or crashes, preventing legitimate users from accessing the service. Potentially impacts other applications running on the same server.
    • Affected Dayjs Component: dayjs() (parsing function), and any plugins that extend parsing capabilities (e.g., customParseFormat).
    • Risk Severity: High
    • Mitigation Strategies:
      • Input Validation: Implement strict input validation before calling dayjs(). Limit the maximum length of input strings. Reject inputs that don't match expected formats using regular expressions.
      • Strict Parsing: Use the strict parsing mode whenever possible: dayjs(input, format, true). This enforces the provided format and rejects invalid dates.
      • Resource Limits: Implement resource limits (e.g., CPU time, memory) for the process handling date parsing. Use timeouts to prevent long-running parsing operations.
      • Rate Limiting: Implement rate limiting to prevent an attacker from submitting a large number of parsing requests in a short period.
      • Monitoring: Monitor application performance and resource usage to detect potential DoS attacks.

Threat: Library Tampering (Tampering)

  • Threat: Library Tampering (Tampering)

    • Description: An attacker compromises the dayjs library itself, either through a supply chain attack (e.g., compromising the npm registry or a CDN) or by directly modifying the library files on the server. The attacker modifies the library code to introduce malicious behavior, such as altering date calculations or injecting malicious code.
    • Impact: Incorrect date/time calculations, leading to data corruption or logic errors. Potential for arbitrary code execution if the attacker can inject JavaScript code.
    • Affected Dayjs Component: The entire dayjs library and any plugins used.
    • Risk Severity: Critical
    • Mitigation Strategies:
      • Subresource Integrity (SRI): Use SRI tags when including dayjs from a CDN.
      • Package Manager & Lock Files: Use a package manager (npm, yarn) and lock files (package-lock.json, yarn.lock) to ensure consistent and verified versions.
      • Regular Updates: Regularly update dayjs to the latest version.
      • Content Security Policy (CSP): Use CSP to restrict the sources from which scripts can be loaded.
      • Code Auditing: Periodically audit the dayjs library code (and its dependencies) for any signs of tampering. This is especially important if you are using a forked or modified version.