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ttj-skills-browser@1.2.16: Suspicious npm security report (Warn) | LPM Firewall

registry / ttj-skills-browser / 1.2.16

ttj-skills-browser@1.2.16

Renamed to 'ttj-skills-playwright'. Please install: npm i -g ttj-skills-playwright

ttj-skills-browser - Dedicated CDP browser with one-shot commands (eval/goto/screenshot) and page reference visualization

AI Security Review

scanned 2mo ago · by lpm-firewall-ai

LPM treats this as warn-only first-party agent extension lifecycle risk. Postinstall creates global Claude Code and Codex skill entries, making package instructions available to those agents. User-invoked CLI commands attach to a local CDP browser and can evaluate supplied JavaScript in the active page. No confirmed data exfiltration or foreign-agent configuration overwrite was found.

Static reason

High-risk behavior combination matched malicious policy.; source matched previously finalized malicious package; routed for review

Trigger

npm postinstall; later agent skill invocation or explicit CLI command

Impact

Persistent package-owned agent integration can steer browser automation and access the active browser session when invoked.

Mechanism

global agent-skill installation plus localhost CDP browser control and self-update

Rationale

The package performs unconsented postinstall mutation of global agent skill directories and provides powerful browser-session automation, so it warrants a warning. The installed skill is first-party and same-named, with no demonstrated malicious chain, so a publish block is not supported.

Evidence

package.jsonscripts/install-skill.js.claude/skills/ttj-skills-browser/SKILL.mddist/browser.jsdist/cdp.jsdist/utils.js~/.claude/skills/ttj-skills-browser/SKILL.md~/.agents/skills/ttj-skills-browser/SKILL.md~/.ttj-skills-browser/.last-update-check

Network endpoints2

Source & flagged code

6 flagged · loading source

package.jsonView file

•scripts.postinstall = node scripts/install-skill.js

High

Install Time Lifecycle Scripts

Package defines install-time lifecycle scripts.

package.jsonView on unpkg

dist/utils.jsView file

5import path from 'path'; L6: import net from 'net'; L7: import https from 'https'; L8: import { exec } from 'child_process'; L9: import { promisify } from 'util'; ... L17: */ L18: export const getOsType = () => process.platform === 'win32' L19: ? 'windows' ... L25: */ L26: export const getHomeDir = () => os.homedir(); L27: /** ... L33: const isWindows = getOsType() === 'windows';

High

Sandbox Evasion Gated Capability

Source gates dangerous network, credential, or execution behavior behind CI, host, platform, time, or geo fingerprint checks.

dist/utils.jsView on unpkg · L5

•matchType = normalized_sha256 matchedPackage = ttj-sk[redacted]@1.2.13 matchedPath = dist/utils.js matchedIdentity = npm:dHRqLXNraWxscy1icm93c2Vy:1.2.13 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.

dist/utils.jsView on unpkg

scripts/install-skill.jsView file

14Install-time AI-agent control hijack evidence: L14: const skillName = 'ttj-sk[redacted]'; L15: const sk[redacted] = path.join(__dirname, '..', '.claude', 'skills', skillName); L16: const skillFile = 'SKILL.md'; ... L19: if (!fs.existsSync(dir)) { L20: fs.mkdirSync(dir, { recursive: true }); L21: } ... L43: // Claude Code: 기존 /ttj-sk[redacted] 호출 방식 유지 L44: const claudeTargetDir = path.join(homedir(), '.claude', 'skills', skillName); L45: const claudeTargetFile = path.join(claudeTargetDir, skillFile); L46: ensureDir(claudeTargetDir); L47: fs.copyFileSync(sourceFile, claudeTargetFile); L48: console.log(`✅ Claude Code 스킬 설치 완료: ${claudeTargetFile}`); Payload evidence from .claude/skills/ttj-sk[redacted]/SKILL.md: L68: L69: ### eval — 활성 탭에서 JS 실행 (결과는 JSON으로 stdout 출력) L70: ```bash ... L78:

Critical

Ai Agent Control Hijack

Install-time source drops package-supplied AI-agent/MCP control files or instructions.

scripts/install-skill.jsView on unpkg · L14

dist/browser.jsView file

•matchType = token_shingles matchedPackage = ttj-sk[redacted]@1.2.13 matchedPath = dist/browser.js matchedIdentity = npm:dHRqLXNraWxscy1icm93c2Vy:1.2.13 similarity = 1.000 shingleOverlap = 48 summary = source token shingles overlapped finalized malicious source

High

Known Malware Source Similarity

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

dist/browser.jsView on unpkg

dist/cli.jsView file

•matchType = normalized_sha256 matchedPackage = ttj-sk[redacted]@1.2.13 matchedPath = dist/cli.js matchedIdentity = npm:dHRqLXNraWxscy1icm93c2Vy:1.2.13 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.

dist/cli.jsView on unpkg

Source & flagged code

6 flagged

package.jsonView file

Lines 1-39json

1{

2 "name": "ttj-skills-browser",

3 "version": "1.2.16",

4 "description": "ttj-skills-browser - Dedicated CDP browser with one-shot commands (eval/goto/screenshot) and page reference visualization",

5 "type": "module",

6 "bin": {

7 "ttj-skills-browser": "dist/cli.js"

8 },

9 "main": "./dist/cli.js",

10 "files": [

11 "dist",

12 ".claude/skills",

13 "scripts"

14 ],

15 "scripts": {

16 "build": "tsc",

17 "start": "node dist/cli.js",

18 "prepare": "npm run build",

19 "postinstall": "node scripts/install-skill.js"

High

Install Time Lifecycle Scripts

Package defines install-time lifecycle scripts.

package.jsonView on unpkg · L19

20 },

21 "dependencies": {

22 "chalk": "^5.3.0",

23 "playwright-core": "^1.61.1"

24 },

25 "devDependencies": {

26 "typescript": "^5.4.0",

27 "@types/node": "^20.11.0"

28 },

29 "keywords": [

30 "playwright",

31 "browser",

32 "automation",

33 "cli"

34 ],

35 "author": "TTJ",

36 "license": "MIT",

37 "repository": {

38 "type": "git",

39 "url": "git+https://github.com/ddoojoang/ttj-skills-browser.git"

dist/utils.jsView file

Lines 1-25javascript

1/**

2 * ttj-skills-browser - Utility functions (pure where possible)

3 */

4import os from 'os';

5import path from 'path';

6import net from 'net';

scripts/install-skill.jsView file

Lines 1-34javascript

1#!/usr/bin/env node

2/**

3 * Claude Code / Codex 스킬 자동 설치

4 * npm install 후 Claude Code와 Codex의 사용자 전역 스킬 위치에 복사합니다.

5 */

6

7import fs from 'fs';

8import path from 'path';

dist/browser.jsView file

•matchType = token_shingles matchedPackage = ttj-sk[redacted]@1.2.13 matchedPath = dist/browser.js matchedIdentity = npm:dHRqLXNraWxscy1icm93c2Vy:1.2.13 similarity = 1.000 shingleOverlap = 48 summary = source token shingles overlapped finalized malicious source

High

Known Malware Source Similarity

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

dist/browser.jsView on unpkg

dist/cli.jsView file

•matchType = normalized_sha256 matchedPackage = ttj-sk[redacted]@1.2.13 matchedPath = dist/cli.js matchedIdentity = npm:dHRqLXNraWxscy1icm93c2Vy:1.2.13 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.

dist/cli.jsView on unpkg