CVE-2018-7160 in Node.js
Summary
by MITRE
The Node.js inspector, in 6.x and later is vulnerable to a DNS rebinding attack which could be exploited to perform remote code execution. An attack is possible from malicious websites open in a web browser on the same computer, or another computer with network access to the computer running the Node.js process. A malicious website could use a DNS rebinding attack to trick the web browser to bypass same-origin-policy checks and to allow HTTP connections to localhost or to hosts on the local network. If a Node.js process with the debug port active is running on localhost or on a host on the local network, the malicious website could connect to it as a debugger, and get full code execution access.
VulDB is the best source for vulnerability data and more expert information about this specific topic.
Analysis
by VulDB Data Team • 03/14/2023
The vulnerability described in CVE-2018-7160 represents a critical security flaw in Node.js inspector functionality affecting versions 6.x and later. This issue stems from insufficient validation of DNS responses during the debugging process, creating an avenue for sophisticated attackers to exploit DNS rebinding techniques. The vulnerability specifically targets the Node.js debugger interface which typically operates on localhost ports, making it particularly dangerous in environments where developers run debug instances on their local machines. The flaw allows attackers to bypass standard browser security mechanisms that normally prevent cross-origin requests, effectively breaking down the security boundaries that protect local network resources.
The technical implementation of this vulnerability leverages DNS rebinding attacks where malicious websites manipulate DNS resolution to redirect requests from legitimate domains to localhost or internal network addresses. When a user visits a compromised website, the browser's DNS cache can be manipulated to resolve domain names to local addresses that were previously inaccessible. This technique exploits the fact that browsers typically cache DNS responses for extended periods, allowing attackers to control which IP addresses are returned for specific domain names. The Node.js inspector interface, which normally requires explicit authentication and operates on privileged ports, becomes vulnerable when attackers can establish connections to these debug ports through the manipulated DNS resolution process.
The operational impact of this vulnerability extends beyond simple code execution, as it enables attackers to gain complete control over Node.js processes running with debug capabilities. The attack vector is particularly concerning because it requires no special privileges or local access to the target system, making it exploitable from any network location where the malicious website can be accessed. Once successful, attackers can execute arbitrary code, read and modify application data, access sensitive information, and potentially escalate their privileges further within the system. The vulnerability is especially dangerous in development environments where debug ports are frequently left open and accessible, as these instances often run with elevated privileges and access to sensitive application data.
Security professionals should note that this vulnerability aligns with CWE-209, which addresses information exposure through an error message, and follows patterns similar to those documented in the ATT&CK framework under T1059 for command and scripting interpreter. The attack chain typically involves initial compromise through web-based delivery, followed by DNS manipulation to gain access to local resources, and finally exploitation of the debug interface for code execution. Organizations should implement immediate mitigations including disabling the Node.js inspector in production environments, restricting network access to debug ports, and ensuring that debug interfaces are not exposed to untrusted networks. Additionally, regular security audits should verify that debug ports are not unnecessarily open and that proper access controls are implemented to prevent unauthorized access to development environments.