bunnyhijack-test-0x00npm

package.json declares "bin": { "node": "./shim.js" }, which causes npm to place a node executable into node_modules/.bin. Since node_modules/.bin is prepended to PATH during npm lifecycle scripts, any sibling dependency whose install/postinstall invokes node (e.g., esbuild and similar packages with native build steps) will execute shim.js from this package instead of the real Node.js runtime. shim.js demonstrates the hijack by writing a marker file at /tmp/.bunnyhijack-test and printing a banner stating the node command was hijacked via esbuild's postinstall. The package's own description self-identifies as a self-triggering PATH-poisoning proof-of-concept, and the dependency on protoc-gen-grpc-web appears chosen to ensure a sibling lifecycle script invokes node during a normal npm install. The current shim payload is benign (marker file + console output), but the hijack primitive itself runs arbitrary code under the installer's user during install and would execute any future payload shipped in shim.js.

Any computer that has this package installed or running should be considered fully compromised. All secrets and keys stored on that computer should be rotated immediately from a different computer. The package should be removed, but as full control of the computer may have been given to an outside entity, there is no guarantee that removing the package will remove all malicious software resulting from installing it.