CVE-2018-3772 in whereis Module
Summary
by MITRE
Concatenating unsanitized user input in the `whereis` npm module < 0.4.1 allowed an attacker to execute arbitrary commands. The `whereis` module is deprecated and it is recommended to use the `which` npm module instead.
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Analysis
by VulDB Data Team • 03/11/2020
The vulnerability identified as CVE-2018-3772 represents a critical command injection flaw within the npm package management ecosystem. This issue affected versions of the `whereis` module prior to 0.4.1, where the module failed to properly sanitize user input before incorporating it into system commands. The vulnerability stems from the module's improper handling of input parameters that are directly concatenated into shell commands without adequate validation or escaping mechanisms. This design flaw creates a pathway for malicious actors to inject arbitrary commands that will be executed with the privileges of the user running the application, potentially leading to complete system compromise.
The technical implementation of this vulnerability aligns with CWE-78, which specifically addresses improper neutralization of special elements used in OS commands. The `whereis` module was designed to locate executables on the system by invoking system commands, but it failed to implement proper input sanitization measures. When user-supplied data was passed to the module without proper validation, attackers could manipulate the input to include shell metacharacters such as semicolons, pipes, or other command separators. This allows for arbitrary command execution, enabling attackers to perform actions ranging from data exfiltration to complete system takeover. The vulnerability operates at the intersection of software development practices and security engineering, demonstrating how seemingly benign input handling can create catastrophic security implications.
The operational impact of CVE-2018-3772 extends beyond individual applications to potentially affect entire development environments and production systems that rely on vulnerable npm modules. Attackers exploiting this vulnerability could execute commands with the privileges of the node.js process, which typically runs with elevated permissions on many systems. This could result in unauthorized access to sensitive data, modification of system files, installation of malware, or even complete system compromise. The vulnerability is particularly concerning in automated build environments or continuous integration systems where npm modules are frequently installed and executed without proper security scanning. Organizations using deprecated modules like `whereis` face significant risk exposure, as the module's deprecation status indicates that it received no further security updates or patches.
Mitigation strategies for CVE-2018-3772 require immediate action to upgrade or replace vulnerable components within affected systems. The primary recommendation involves upgrading to version 0.4.1 or later of the `whereis` module, which includes proper input sanitization and validation mechanisms. However, given that the module is deprecated, organizations should transition to the recommended alternative `which` npm module, which provides similar functionality with proper security implementations. Security measures should include comprehensive dependency auditing using tools like npm audit or third-party vulnerability scanners to identify all instances of vulnerable modules. Additionally, implementing proper input validation and sanitization practices throughout the application codebase can provide defense-in-depth protection against similar vulnerabilities. The ATT&CK framework categorizes this type of vulnerability under T1059.001 for command and script injection, emphasizing the need for proper input handling and the importance of maintaining up-to-date software dependencies to prevent exploitation attempts.