Detecting and Characterizing Propagation of Security Weaknesses in Puppet-based Infrastructure Management

TL;DR

This paper presents an empirical study on how security weaknesses in Puppet manifests propagate through infrastructure, introducing TaintPup, a tool with higher precision for detecting such weaknesses, and analyzing their impact on resources.

Contribution

It introduces TaintPup, a Puppet-specific static analysis tool with improved precision, and provides a comprehensive empirical analysis of security weakness propagation in Puppet-managed infrastructure.

Findings

Security weaknesses propagate into 4,457 resources

A single weakness can affect up to 35 resources

Propagation into data storage resources is most severe

Abstract

Despite being beneficial for managing computing infrastructure automatically, Puppet manifests are susceptible to security weaknesses, e.g., hard-coded secrets and use of weak cryptography algorithms. Adequate mitigation of security weaknesses in Puppet manifests is thus necessary to secure computing infrastructure that are managed with Puppet manifests. A characterization of how security weaknesses propagate and affect Puppet-based infrastructure management, can inform practitioners on the relevance of the detected security weaknesses, as well as help them take necessary actions for mitigation. To that end, we conduct an empirical study with 17,629 Puppet manifests mined from 336 open source repositories. We construct Taint Tracker for Puppet Manifests (TaintPup), for which we observe 2.4 times more precision compared to that of a state-of-the-art security static analysis tool. TaintPup leverages Puppet-specific information flow analysis using which we characterize propagation of security weaknesses. From our empirical study, we observe security weaknesses to propagate into 4,457 resources, i.e, Puppet-specific code elements used to manage infrastructure. A single instance of a security weakness can propagate into as many as 35 distinct resources. We observe security weaknesses to propagate into 7 categories of resources, which include resources used to manage continuous integration servers and network controllers. According to our survey with 24 practitioners, propagation of security weaknesses into data storage-related resources is rated to have the most severe impact for Puppet-based infrastructure management.