Small World with High Risks: A Study of Security Threats in the npm Ecosystem

TL;DR

This paper analyzes security vulnerabilities in the npm ecosystem, revealing how dependency networks and unmaintained packages create significant risks, including single points of failure and widespread malicious code injection potential.

Contribution

It provides a systematic analysis of npm dependencies, maintainer influence, and security issues, highlighting the risks of single points of failure and proposing mitigation strategies.

Findings

Individual packages can impact large parts of npm ecosystem.

Few maintainer accounts can inject malicious code into most packages.

Unmaintained packages often depend on vulnerable code for years.

Abstract

The popularity of JavaScript has lead to a large ecosystem of third-party packages available via the npm software package registry. The open nature of npm has boosted its growth, providing over 800,000 free and reusable software packages. Unfortunately, this open nature also causes security risks, as evidenced by recent incidents of single packages that broke or attacked software running on millions of computers. This paper studies security risks for users of npm by systematically analyzing dependencies between packages, the maintainers responsible for these packages, and publicly reported security issues. Studying the potential for running vulnerable or malicious code due to third-party dependencies, we find that individual packages could impact large parts of the entire ecosystem. Moreover, a very small number of maintainer accounts could be used to inject malicious code into the majority of all packages, a problem that has been increasing over time. Studying the potential for accidentally using vulnerable code, we find that lack of maintenance causes many packages to depend on vulnerable code, even years after a vulnerability has become public. Our results provide evidence that npm suffers from single points of failure and that unmaintained packages threaten large code bases. We discuss several mitigation techniques, such as trusted maintainers and total first-party security, and analyze their potential effectiveness.