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bumper-guard@0.2.4: AI-agent control-surface risk | LPM Firewall

registry / bumper-guard / 0.2.4

bumper-guard@0.2.4

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. Automatic installation modifies detected user-level AI-agent control files, launches a daemon, and creates login persistence. These actions occur without an explicit setup command or consent prompt.

Static reason

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

Trigger

npm postinstall during package installation.

Impact

The package can intercept or influence tool-use decisions across installed AI assistants and remain active after login.

Mechanism

Global agent-hook injection plus detached daemon startup and user-service persistence.

Policy narrative

Installing the package triggers postinstall. It discovers local AI-agent configuration directories, adds global command hooks, starts its daemon detached, and writes an operating-system login startup mechanism. This is an unconsented install-time takeover of broad user-level AI-agent control surfaces and persistence.

Rationale

The source establishes a complete automatic lifecycle chain from npm postinstall to global AI-agent configuration mutation, detached execution, and login persistence. That matches install-hook abuse under the stated policy even though no secret-exfiltration path was found.

Evidence

package.jsonsrc/installers/postinstall.jssrc/installers/claude-code.jssrc/installers/autostart.js~/.claude/settings.json~/.cursor/hooks.json~/.copilot/hooks/bumper.json~/.codex/config.toml~/Library/LaunchAgents/com.bumper.autostart.plist

Source & flagged code

7 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

•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@0.2.1 matchedPath = src/installers/autostart.js matchedIdentity = npm:YnVtcGVyLWd1YXJk:0.2.1 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

src/account.jsView file

•matchType = normalized_sha256 matchedPackage = bumper-guard@0.2.1 matchedPath = src/account.js matchedIdentity = npm:YnVtcGVyLWd1YXJk:0.2.1 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

src/policy.jsView file

•matchType = normalized_sha256 matchedPackage = bumper-guard@0.2.1 matchedPath = src/policy.js matchedIdentity = npm:YnVtcGVyLWd1YXJk:0.2.1 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/policy.jsView on unpkg

Source & flagged code

7 flagged

package.jsonView file

Lines 1-35json

1{

2 "name": "bumper-guard",

3 "version": "0.2.4",

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

src/installers/autostart.jsView file

Lines 1-23javascript

1const fs = require("fs");

2const os = require("os");

3const path = require

src/account.jsView file

•matchType = normalized_sha256 matchedPackage = bumper-guard@0.2.1 matchedPath = src/account.js matchedIdentity = npm:YnVtcGVyLWd1YXJk:0.2.1 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

src/policy.jsView file

•matchType = normalized_sha256 matchedPackage = bumper-guard@0.2.1 matchedPath = src/policy.js matchedIdentity = npm:YnVtcGVyLWd1YXJk:0.2.1 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/policy.jsView on unpkg