The 'consumerweb' npm package version 2200.4.2 executes code during both preinstall and postinstall lifecycle hooks that runs an index.js script. This script collects host reconnaissance data including hostname, username, home directory, current working directory, DNS servers, and package metadata. The collected data is exfiltrated via DNS lookups and HTTPS POST requests to a subdomain of oast.fun, an attacker-controlled out-of-band interaction service. The package name and description suggest it is attempting a dependency confusion attack by squatting on an internal package name, confirming the internal package's existence and leaking environment information to the attacker. There is no legitimate use case for this data collection and exfiltration, and no installer opt-in is involved.

Successful installation of this malicious package confirms the internal package name is squattable and leaks sensitive environment information such as host identifiers and DNS configuration to an attacker-controlled endpoint. This can aid attackers in further reconnaissance and targeted attacks within the victim's environment. The exfiltration occurs without user consent or awareness.

No patch or official fix is currently documented. Users should avoid installing the affected version (=2200.4.2) of the 'consumerweb' package. Verify package sources and avoid installing packages with suspicious or internal-looking names from public registries. Monitor for updates or advisories from the package maintainer or npm registry regarding remediation. Since this is not a cloud service, remediation depends on user action to avoid or remove the malicious package.