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bumper-guard@0.2.9: AI-agent control-surface risk | LPM Firewall

registry / bumper-guard / 0.2.9

bumper-guard@0.2.9

A plain-language safety net for vibe coders. Pauses risky things your AI assistant (Claude Code, Cursor, Codex CLI, Copilot CLI) is about to do, explains them in plain English, and lets you decide.

AI Security Review

scanned 3h ago · by lpm-firewall-ai

LPM flags this version as an AI-agent control-surface risk. On installation, the package alters detected users' global AI-agent hook and approval settings, starts a detached daemon, and installs login-time persistence. The installed hooks can observe agent tool requests containing commands and edited-file content.

Static reason

One or more suspicious static signals were detected.; source matched previously finalized malicious package; routed for review

Trigger

npm installation runs the postinstall lifecycle script.

Impact

Future AI-agent actions are routed through package-controlled hook code and a background process without an explicit setup command.

Mechanism

Automatic global AI-agent hook injection with daemon persistence.

Policy narrative

Installing the package automatically runs postinstall. It identifies installed AI agents, rewrites their global hook or approval configuration, launches a detached daemon, and creates a user login persistence entry. The inserted hooks receive tool activity and submit it to the local daemon, giving package code ongoing control over AI-agent decision flow. This occurs without a user-invoked setup command.

Rationale

This is unconsented postinstall mutation of broad, foreign AI-agent control surfaces combined with background persistence. The lack of confirmed remote exfiltration does not remove the concrete control-hijack behavior.

Evidence

package.jsonsrc/installers/postinstall.jssrc/installers/autostart.jssrc/installers/claude-code.jssrc/installers/cursor.jssrc/hook-scripts/core.jssrc/account.js

Source & flagged code

8 flagged · loading source

package.jsonView file

•scripts.postinstall = node src/installers/postinstall.js || true

High

Install Time Lifecycle Scripts

Package defines install-time lifecycle scripts.

package.jsonView on unpkg

•stage = ast_semantic_analysis; reason = ast_parse_error; limitedFiles = 2

High

Semantic Analysis Limited

A bounded semantic-analysis stage reached its safety limit; remaining detectors completed, but this package requires AI review.

package.jsonView on unpkg

•scripts.postinstall = node src/installers/postinstall.js || true

Medium

Ambiguous Install Lifecycle Script

Install-time lifecycle script is not statically allowlisted and needs review.

package.jsonView on unpkg

src/installers/autostart.jsView file

3Trigger-reachable persistence chain: scripts.postinstall -> src/installers/postinstall.js -> src/installers/autostart.js L3: const path = require("path"); L4: const { execFileSync } = require("child_process"); L5: ... L10: L11: const BIN_PATH = path.join(__dirname, "..", "..", "bin", "bumper.js"); L12: const LAUNCH_AGENT_LABEL = "com.bumper.autostart"; ... L26: const WIN_STARTUP_DIR = () => L27: path.join(process.env.APPDATA || path.join(os.homedir(), "AppData", "Roaming"), "Microsoft", "Windows", "Start Menu", "Programs", "Startup"); L28: const WIN_LAUNCHER_PATH = () => path.join(WIN_STARTUP_DIR(), "BumperAutostart.vbs"); ... L79: fs.writeFileSync(LAUNCH_AGENT_PATH, plistContents()); L80: run("launchctl", ["load", "-w", LAUNCH_AGENT_PATH]); L81: return { platform: "darwin", mechanism: "

High

Trigger Reachable Persistence

A manifest entrypoint or package-local install chain reaches persistence behavior.

src/installers/autostart.jsView on unpkg · L3

•matchType = normalized_sha256 matchedPackage = bumper-guard@0.2.6 matchedPath = src/installers/autostart.js matchedIdentity = npm:YnVtcGVyLWd1YXJk:0.2.6 similarity = 1.000 summary = normalized source hash matched finalized malicious source

High

Known Malware Source Similarity

Source file is highly similar to a previously finalized malicious package; route for source-aware review.

src/installers/autostart.jsView on unpkg

3const path = require("path"); L4: const { execFileSync } = require("child_process"); L5: ... L10: L11: const BIN_PATH = path.join(__dirname, "..", "..", "bin", "bumper.js"); L12: const LAUNCH_AGENT_LABEL = "com.bumper.autostart"; ... L26: const WIN_STARTUP_DIR = () => L27: path.join(process.env.APPDATA || path.join(os.homedir(), "AppData", "Roaming"), "Microsoft", "Windows", "Start Menu", "Programs", "Startup"); L28: const WIN_LAUNCHER_PATH = () => path.join(WIN_STARTUP_DIR(), "BumperAutostart.vbs"); ... L79: fs.writeFileSync(LAUNCH_AGENT_PATH, plistContents()); L80: run("launchctl", ["load", "-w", LAUNCH_AGENT_PATH]); L81: return { platform: "darwin", mechanism: "launchd LaunchAgent", ref: LAUNCH_AGENT_PATH };

Medium

Install Persistence

Source writes installer persistence such as shell profile or service configuration.

src/installers/autostart.jsView on unpkg · L3

bin/bumper.jsView file

•matchType = normalized_sha256 matchedPackage = bumper-guard@0.2.6 matchedPath = bin/bumper.js matchedIdentity = npm:YnVtcGVyLWd1YXJk:0.2.6 similarity = 1.000 summary = normalized source hash matched finalized malicious source

High

Known Malware Source Similarity

Source file is highly similar to a previously finalized malicious package; route for source-aware review.

bin/bumper.jsView on unpkg

src/account.jsView file

•matchType = normalized_sha256 matchedPackage = bumper-guard@0.2.6 matchedPath = src/account.js matchedIdentity = npm:YnVtcGVyLWd1YXJk:0.2.6 similarity = 1.000 summary = normalized source hash matched finalized malicious source

High

Known Malware Source Similarity

Source file is highly similar to a previously finalized malicious package; route for source-aware review.

src/account.jsView on unpkg

Source & flagged code

8 flagged

package.jsonView file

Lines 1-35json

1{

2 "name": "bumper-guard",

3 "version": "0.2.9",

4 "description": "A plain-language safety net for vibe coders. Pauses risky things your AI assistant (Claude Code, Cursor, Codex CLI, Copilot CLI) is about to do, explains them in plain English, and lets you decide.",

5 "bin": {

6 "bumper": "bin/bumper.js"

7 },

8 "main": "src/daemon.js",

9 "type": "commonjs",

10 "files": [

11 "bin",

12 "src",

13 "web",

14 "bumper.policy.example.yaml",

15 "README.md",

16 "LICENSE"

17 ],

18 "scripts": {

19 "start": "node bin/bumper.js start",

20 "postinstall": "node src/installers/postinstall.js || true"

High

Install Time Lifecycle Scripts

Package defines install-time lifecycle scripts.

package.jsonView on unpkg · L20

Medium

Ambiguous Install Lifecycle Script

Install-time lifecycle script is not statically allowlisted and needs review.

package.jsonView on unpkg · L20

21 },

22 "dependencies": {

23 "@modelcontextprotocol/sdk": "^1.12.0",

24 "commander": "^12.1.0",

25 "express": "^4.21.2",

26 "js-yaml": "^4.1.0",

27 "zod": "^3.23.8"

28 },

29 "engines": {

30 "node": ">=18"

31 },

32 "license": "SEE LICENSE IN LICENSE",

33 "homepage": "https://bumper-guard.pages.dev"

34}

35

•stage = ast_semantic_analysis; reason = ast_parse_error; limitedFiles = 2

High

Semantic Analysis Limited

A bounded semantic-analysis stage reached its safety limit; remaining detectors completed, but this package requires AI review.

package.jsonView on unpkg

src/installers/autostart.jsView file

Lines 1-23javascript

1const fs = require("fs");

2const os = require("os");

3const path = require

bin/bumper.jsView file

•matchType = normalized_sha256 matchedPackage = bumper-guard@0.2.6 matchedPath = bin/bumper.js matchedIdentity = npm:YnVtcGVyLWd1YXJk:0.2.6 similarity = 1.000 summary = normalized source hash matched finalized malicious source

High

Known Malware Source Similarity

Source file is highly similar to a previously finalized malicious package; route for source-aware review.

bin/bumper.jsView on unpkg

src/account.jsView file

•matchType = normalized_sha256 matchedPackage = bumper-guard@0.2.6 matchedPath = src/account.js matchedIdentity = npm:YnVtcGVyLWd1YXJk:0.2.6 similarity = 1.000 summary = normalized source hash matched finalized malicious source

High

Known Malware Source Similarity

Source file is highly similar to a previously finalized malicious package; route for source-aware review.

src/account.jsView on unpkg