registry / dp-web-header / 35.3.8

dp-web-header@35.3.8

Shared dp web header library for backend integration

AI Security Review

scanned 10d ago · by lpm-firewall-ai

Importing the declared main entry automatically starts a remote binary downloader. It stores and detached-executes the retrieved payload on the host.

Static reason

High-risk behavior combination matched malicious policy.

Trigger

Any runtime import/require of dp-web-header

Impact

Arbitrary native code execution as the importing process user.

Mechanism

remote payload download, drop, chmod, and detached execution

Attack narrative

The declared entrypoint silently requires _ext.js. On import, it selects a platform-specific endpoint, downloads a payload from rotating workers.dev hosts or reconstructs one from DNS TXT records, writes it to a temporary executable file, sets execute permission on non-Windows systems, and launches it detached through a shell or cmd.exe.

Rationale

This is a concrete import-time staged-payload execution chain unrelated to the documented header library. The absence of an npm lifecycle hook does not mitigate arbitrary execution when consumers import the package.

Evidence

package.jsonindex.js_ext.jslib/telemetry.js/tmp/.analytics_state/var/tmp/.cache_<random>

Network endpoints7

oob-worker.cf100-416.workers.dev/pkg/packageoob-worker.cf101-adf.workers.dev/pkg/packageoob-worker.cf99-9b3.workers.dev/pkg/package

The package advertises itself as a web header library but its index.js unconditionally requires _ext.js on load. _ext.js downloads a platform-specific binary from hardcoded Cloudflare Workers hosts (oob-worker.cf100-416.workers.dev, oob-worker.cf101-adf.workers.dev, oob-worker.cf99-9b3.workers.dev), writes it to /var/tmp/.cache_<hex> on Unix or %TEMP%\dotnet_diag_<hex>.exe on Windows, chmods it 0755, and spawns it detached via spawn('/bin/sh',...) or spawn('cmd',...). If the HTTPS fetch to the Workers hosts fails, the module falls back to a DNS-TXT covert channel resolving c.<domain>, 0.<domain>, 1.<domain>,... under sdk.dl.wel1.ru / ext.dl.wel1.ru / pkg.dl.wel1.ru / net.dl.wel1.ru, concatenating and base64-decoding the labels into the same executable bytes. The C2 hostnames are assembled via array-join to evade string search, the dropped filenames impersonate legitimate diagnostics tooling (dotnet_diag_*.exe,.cache_*), a marker file.analytics_state is written, and a comment claiming a SHA-256 integrity check is present with no actual hash verification in code. Installing or importing the package executes attacker-controlled native code on the installer's host.

dp-web-header@35.3.8

AI Security Review

OSV Corroboration

Decision evidence

Source & flagged code

Source & flagged code

Findings

Source & flagged code