취약점

The npm package dependency_confusions version 99.9.9 performs install-time host fingerprint and project path exfiltration. package.json sets index.js as the package main entrypoint and defines postinstall: node index.js. During npm install, index.js builds a JSON payload containing the local username from os.userInfo().username, the current project path from INIT_CWD or process.cwd(), the hostname from os.hostname(), the first non-internal local IPv4 address from os.networkInterfaces(), the platform from os.platform(), and an install timestamp. It then sends that payload with https.request to a webhook.site endpoint. This leaks developer or CI host identity and project path context to an attacker-controlled endpoint without user consent and is typical dependency-confusion reconnaissance behavior.

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Source: amazon-inspector (2c5eab14c78cbbb6e4b580162a242817f899f6529485cb7f9197b6dfe05a3413)

package.json declares a postinstall hook that runs index.js on npm install. On execution, index.js collects the installer's OS username (os.userInfo()), hostname (os.hostname()), current working directory, local IPv4 address, and platform (os.platform()), then POSTs the collected fields as JSON to a hardcoded webhook.site endpoint (https://webhook.site/264e1903-28ea-48ea-8c55-be58c5a76791). Fires automatically as a lifecycle hook without user consent, matching the classic dependency-confusion reconnaissance beacon: the exfiltrated username/hostname/cwd/localIP reveal internal build hosts and internal package namespaces that an attacker uses to target follow-on dependency-confusion attacks against the victim's private registry.