CVE-2020-8186

Vulnerability

Overview

The devcert npm module, which is used to automate the creation and management of trusted SSL certificates for local development, contains a command injection vulnerability. The flaw resides in the certificateFor function, which fails to properly sanitize user-supplied input. When untrusted data is passed to this function, an attacker can inject arbitrary operating system commands that are executed with the privileges of the running process [1].

Attack

Vector and Prerequisites

Exploitation requires that an application using the devcert module passes untrusted input to the certificateFor function. This could occur, for example, when a developer tool processes a domain name or other parameter supplied by an external source without sufficient validation. The attacker does not need local access; the attack can be performed remotely if the application exposes the vulnerable function to external input [1].

Impact

Successful exploitation leads to remote code execution (RCE) on the system where the vulnerable module is used. An attacker could execute arbitrary commands, potentially leading to full compromise of the development machine, data theft, or lateral movement within a network [1].

Mitigation

Status

A fix was released by the devcert maintainers shortly after the vulnerability was disclosed via HackerOne. Users should update to the latest patched version of the module. No workaround is available other than ensuring that no untrusted input reaches the certificateFor function [1].