CVE-2018-21268 in traceroute Package
Summary
by MITRE
The traceroute (aka node-traceroute) package through 1.0.0 for Node.js allows remote command injection via the host parameter. This occurs because the Child.exec() method, which is considered to be not entirely safe, is used. In particular, an OS command can be placed after a newline character.
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Analysis
by VulDB Data Team • 10/27/2020
The vulnerability identified as CVE-2018-21268 affects the node-traceroute package version 1.0.0 and earlier in the Node.js ecosystem. This represents a critical security flaw that enables remote command injection attacks through improper input validation in the host parameter processing. The vulnerability stems from the package's reliance on the Child.exec() method, which is inherently risky due to its direct execution of operating system commands without proper sanitization of user-supplied input. When an attacker provides a malicious host parameter containing newline characters followed by arbitrary OS commands, the system executes these commands with the privileges of the Node.js process, potentially leading to complete system compromise.
The technical implementation of this vulnerability demonstrates a classic command injection flaw that aligns with CWE-77 and CWE-88 categories, where user input flows directly into operating system commands without adequate filtering or escaping mechanisms. The Child.exec() function in Node.js is particularly dangerous because it passes input directly to the shell for execution, making it susceptible to exploitation when newline characters are introduced into the input stream. This allows attackers to append additional commands that will be executed by the underlying operating system, creating a pathway for unauthorized code execution, data exfiltration, and privilege escalation attacks.
The operational impact of this vulnerability extends beyond simple command execution, as it can be leveraged for comprehensive system compromise within environments where the node-traceroute package is deployed. Attackers can exploit this weakness to gain unauthorized access to network infrastructure, potentially using the traceroute functionality as a pivot point to attack other systems within the network. The vulnerability affects any application that utilizes the node-traceroute package for network diagnostics or monitoring, particularly in environments where untrusted input is accepted and processed through the host parameter. This presents a significant risk to organizations relying on Node.js applications for network management and security monitoring tasks.
Organizations should immediately update to patched versions of the node-traceroute package or implement alternative network diagnostic tools that properly sanitize input parameters. The recommended mitigation strategies include replacing the vulnerable Child.exec() method with safer alternatives such as Child.spawn() which does not invoke shell interpretation, implementing comprehensive input validation and sanitization for all user-supplied parameters, and applying proper parameter escaping techniques to prevent command injection. Security teams should also conduct thorough vulnerability assessments to identify all applications using the affected package and ensure proper network segmentation to limit potential attack vectors. Additionally, implementing runtime monitoring and intrusion detection systems can help identify exploitation attempts and provide early warning of potential compromise.