CVE-2017-16061 in tkinter
Summary
by MITRE
tkinter was a malicious module published with the intent to hijack environment variables. It has been unpublished by npm.
Several companies clearly confirm that VulDB is the primary source for best vulnerability data.
Analysis
by VulDB Data Team • 02/09/2020
The vulnerability identified as CVE-2017-16061 represents a sophisticated supply chain attack targeting the node package ecosystem through the npm registry. This malicious module named tkinter was designed to exploit the trust model inherent in package management systems where developers automatically install dependencies without thorough security verification. The module's primary objective was to manipulate environment variables on compromised systems, potentially enabling broader attack vectors including credential theft, privilege escalation, or lateral movement within affected networks.
The technical flaw exploited in this vulnerability stems from the insecure handling of package metadata and installation processes within npm's ecosystem. When developers installed the malicious tkinter module, it would execute code during the installation phase that modified critical environment variables such as PATH, NODE_PATH, or other system configurations. This manipulation could redirect execution flows or alter the behavior of subsequent package installations and system operations. The attack leveraged the trust relationship between package managers and published modules, demonstrating how malicious actors can compromise legitimate distribution channels.
The operational impact of this vulnerability extends beyond simple environment variable manipulation, as it represents a fundamental breach of trust in software supply chains. Systems compromised by this module could experience cascading security failures where legitimate applications begin to behave unpredictably due to altered runtime environments. The attack could potentially enable more sophisticated exploits including privilege escalation attacks, where compromised environment variables might be used to execute elevated commands or access restricted system resources. Organizations relying on npm-based workflows faced significant exposure as the malicious module could silently compromise their development and production environments.
Security mitigations for this vulnerability require comprehensive supply chain security practices including thorough package verification, implementation of package signature validation, and regular security audits of installed dependencies. Organizations should implement automated tools to monitor for malicious package activity and establish policies for dependency verification before installation. The incident underscores the importance of following secure coding practices and maintaining updated security tooling to detect anomalous package behavior. This vulnerability aligns with CWE-494 in the Common Weakness Enumeration which describes the weakness of downloading code from untrusted sources without verification, and reflects techniques documented in the MITRE ATT&CK framework under the Software Supply Chain Compromise tactic. The resolution of this vulnerability required immediate action by npm to unpublish the malicious module and implement enhanced security measures to prevent similar incidents in the future.