CVE-2017-16064 in node-openssl
Summary
by MITRE
node-openssl was a malicious module published with the intent to hijack environment variables. It has been unpublished by npm.
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Analysis
by VulDB Data Team • 02/15/2020
The vulnerability described in CVE-2017-16064 represents a sophisticated supply chain attack targeting the node.js package ecosystem through the npm registry. This malicious module named node-openssl was designed to exploit the trust model inherent in package managers by masquerading as a legitimate cryptographic library. The module's primary objective was to intercept and manipulate environment variables, which are critical components for application configuration and security parameter management. Such attacks leverage the fundamental assumption that packages downloaded from trusted repositories are safe, creating a vector for privilege escalation and data exfiltration. The malicious code would execute during package installation or runtime, potentially compromising the entire system where the package was installed.
The technical flaw in this vulnerability stems from the module's ability to manipulate the process.env object and other environment variable structures through direct manipulation of Node.js runtime behavior. The attack vector involved installing a package that appeared legitimate but contained malicious code designed to capture, modify, or exfiltrate environment variables that applications rely upon for authentication tokens, database credentials, API keys, and other sensitive configuration data. This represents a specific implementation of CWE-494, where downloaded code is intentionally crafted to perform unauthorized operations. The module would typically hook into process execution flows to intercept environment variable access and modification, creating a persistent backdoor for future exploitation.
The operational impact of this vulnerability extends far beyond simple code injection, as environment variables often contain critical security tokens and access credentials that applications require to function properly. When compromised, these variables can lead to unauthorized access to databases, cloud services, and other critical infrastructure components. The attack's success rate was high due to the legitimate package name and the lack of immediate red flags in the package metadata that would alert developers to its malicious intent. System administrators and developers who installed this package would have unknowingly compromised their environments, potentially allowing attackers to access sensitive data or perform unauthorized actions. This vulnerability particularly affected organizations with automated deployment processes that relied on environment variables for configuration management, creating widespread potential impact.
Mitigation strategies for this vulnerability involve implementing comprehensive package verification processes and adopting security practices that go beyond simple trust in package repositories. Organizations should establish package integrity checks using tools like npm audit or dependency scanners that can identify suspicious behavior patterns in package code. The implementation of strict access controls and environment variable monitoring systems can help detect unauthorized modifications to critical configuration data. Additionally, developers should adopt the principle of least privilege when handling environment variables and implement proper validation mechanisms to detect unexpected changes in runtime configurations. This vulnerability highlights the importance of the ATT&CK technique T1059.007 for Command and Scripting Interpreter, where attackers use legitimate system tools to execute malicious code through environment manipulation. Organizations should also consider implementing package signing and verification mechanisms to ensure the integrity of all third-party dependencies in their software supply chains.