Loading npm security reports…

bumper-guard@0.2.3: AI-agent control-surface risk | LPM Firewall

registry / bumper-guard / 0.2.3

bumper-guard@0.2.3

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 3d ago · by lpm-firewall-ai

LPM flags this version as an AI-agent control-surface risk. Installation automatically changes foreign agents' global control settings without a consent gate. It also starts the package daemon and installs login persistence.

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 script; existing agent directories activate global configuration changes.

Impact

Agent tool approval behavior changes across projects, and package code continues running beyond installation.

Mechanism

The lifecycle script invokes global installers that write agent configuration and command hooks, then enables an operating-system startup service.

Policy narrative

The npm postinstall hook detects existing agent directories and immediately invokes global configuration installers. The Claude installer inserts a command hook matching every tool into user settings, while the Codex installer appends an approval policy when absent. These changes require no explicit setup command or consent prompt. The same lifecycle script starts a detached daemon and enables login persistence. This establishes an automatic, unconsented mutation of foreign AI-agent control surfaces.

AI rationale

Inspected source establishes unconsented postinstall writes to foreign agents' global control settings, which meets the blocking policy. Existing-policy preservation and package-aligned authentication do not neutralize that automatic mutation.

Evidence

package.jsonsrc/installers/postinstall.jssrc/installers/claude-code.jssrc/installers/codex.jssrc/installers/util.jssrc/installers/autostart.js

Source & flagged code

9 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@0.2.8 matchedPath = src/installers/autostart.js matchedIdentity = npm:YnVtcGVyLWd1YXJk:0.2.8 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/daemon.jsView file

•matchType = normalized_sha256 matchedPackage = bumper-guard@0.2.5 matchedPath = src/daemon.js matchedIdentity = npm:YnVtcGVyLWd1YXJk:0.2.5 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/daemon.jsView on unpkg

src/account.jsView file

•matchType = normalized_sha256 matchedPackage = bumper-guard@0.2.8 matchedPath = src/account.js matchedIdentity = npm:YnVtcGVyLWd1YXJk:0.2.8 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@0.2.6 matchedPath = src/policy.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/policy.jsView on unpkg

Source & flagged code

9 flagged

package.jsonView file

Lines 1-35json

1{

2 "name": "bumper-guard",

3 "version": "0.2.3",

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

src/daemon.jsView file

•matchType = normalized_sha256 matchedPackage = bumper-guard@0.2.5 matchedPath = src/daemon.js matchedIdentity = npm:YnVtcGVyLWd1YXJk:0.2.5 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/daemon.jsView on unpkg

src/account.jsView file

•matchType = normalized_sha256 matchedPackage = bumper-guard@0.2.8 matchedPath = src/account.js matchedIdentity = npm:YnVtcGVyLWd1YXJk:0.2.8 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@0.2.6 matchedPath = src/policy.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/policy.jsView on unpkg