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claude-multiacc@2.0.20: Malicious npm security report (Block) | LPM Firewall

registry / claude-multiacc / 2.0.20

claude-multiacc@2.0.20

Unified Claude Code and OpenAI Codex subscription pooling with quota-aware selection.

AI Security Review

scanned 25d ago · by lpm-firewall-ai

A global installation automatically changes the command resolution and persistence of both Claude Code and Codex. It can later transfer subscription setup tokens to a hard-coded remote server when synchronization runs.

Static reason

One or more suspicious static signals were detected.; previous stored version diff introduced dangerous source

Trigger

Global npm installation activates postinstall; installed scheduled jobs and later account synchronization extend the effect.

Impact

Future Claude and Codex invocations can be intercepted by package shims, while portable Claude credentials may be sent to a package-selected remote host.

Mechanism

Postinstall shell/PATH hijacking, scheduler persistence, automatic updates, and token synchronization.

Attack narrative

Installing this package globally runs its installer without a separate setup command. The installer prepends package shims ahead of both Claude and Codex, creates recurring jobs, and may create system-wide command symlinks. The recurring jobs can self-update the package from npm. The package also assigns a hard-coded remote server as the default sync destination; its sync implementation sends portable Claude setup tokens there when synchronization is invoked.

AI rationale

This is an unconsented global npm lifecycle mutation of broad AI-agent command and persistence surfaces, combined with automatic self-updating. It also contains a concrete credential-transfer path to a hard-coded remote host.

Evidence

scripts/postinstall.mjsinstall.shlib/common.shbin/claude-accountsbin/codex-accounts$HOME/.zshenv$HOME/.zprofile$HOME/.zshrc

Source & flagged code

7 flagged · loading source

package.jsonView file

•scripts.postinstall = node scripts/postinstall.mjs

High

Install Time Lifecycle Scripts

Package defines install-time lifecycle scripts.

package.jsonView on unpkg

•scripts.postinstall = node scripts/postinstall.mjs

Medium

Ambiguous Install Lifecycle Script

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

package.jsonView on unpkg

install.shView file

•path = install.sh kind = build_helper sizeBytes = 22327 magicHex = [redacted]

Medium

Ships Build Helper

Package ships non-JavaScript build or shell helper files.

install.shView on unpkg

tests/test_selector.pyView file

•path = tests/test_selector.py kind = payload_in_excluded_dir sizeBytes = 17190 magicHex = [redacted]

High

Payload In Excluded Dir

Package hides binary, compressed, or executable-looking payloads in test/fixture/hidden paths.

tests/test_selector.pyView on unpkg

bin/multiacc-selectView file

•stage = ast_semantic_analysis; reason = ast_parse_error; limitedFiles = 1

High

Semantic Analysis Limited

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

bin/multiacc-selectView on unpkg

bin/claudeView file

•matchType = previous_version_dangerous_delta matchedPackage = claude-multiacc@2.0.19 matchedIdentity = npm:Y2xhdWRlLW11bHRpYWNj:2.0.19 similarity = 0.400 summary = stored previous version shares package body but lacks this dangerous source file

High

Previous Version Dangerous Delta

This package version adds a dangerous source file absent from the previous stored version; route for source-aware review.

bin/claudeView on unpkg

scripts/postinstall.mjsView file

19// Only auto-run for a real global install. `npm[redacted]` is set by npm for -g. if (process.env.CLAUDE_MULTIACC_SKIP_POSTINSTALL === '1') skip('CLAUDE_MULTIACC_SKIP_POSTINSTALL=1'); if (process.env.CI) skip('CI environment'); const isGlobal = process.env.npm[redacted] === 'true' || process.env.npm[redacted] === '1'; if (!isGlobal) skip('local/dev install — not global'); if (process.platform === 'win32') skip('Windows is not supported by the shim'); console.log('claude-multiacc: configuring the PATH shim + scheduled jobs (install.sh)…'); const r = spawnSync('bash', [join(ROOT

High

Suspicious Lifecycle Evidence

A global npm postinstall automatically launches the installer.

scripts/postinstall.mjsView on unpkg · L19

Source & flagged code

7 flagged

package.jsonView file

Lines 35-62json

35 ],

36 "author": {

37 "name": "Gowalk"

38 },

39 "license": "MIT",

40 "repository": {

41 "type": "git",

42 "url": "git+https://github.com/gowalk-public/claude-multiacc.git"

43 },

44 "homepage": "https://github.com/gowalk-public/claude-multiacc#readme",

45 "bugs": {

46 "url": "https://github.com/gowalk-public/claude-multiacc/issues"

47 },

48 "publishConfig": {

49 "access": "public"

50 },

51 "engines": {

52 "node": ">=18"

53 },

54 "scripts": {

55 "postinstall": "node scripts/postinstall.mjs",

High

Install Time Lifecycle Scripts

Package defines install-time lifecycle scripts.

package.jsonView on unpkg · L55

Medium

Ambiguous Install Lifecycle Script

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

package.jsonView on unpkg · L55

56 "test": "bash tests/run-tests.sh && python3 tests/test_selector.py"

57 },

58 "dependencies": {

59 "update-notifier": "^7.3.1"

60 }

61}

62

install.shView file

•path = install.sh kind = build_helper sizeBytes = 22327 magicHex = [redacted]

Medium

Ships Build Helper

Package ships non-JavaScript build or shell helper files.

install.shView on unpkg

tests/test_selector.pyView file

•path = tests/test_selector.py kind = payload_in_excluded_dir sizeBytes = 17190 magicHex = [redacted]

High

Payload In Excluded Dir

Package hides binary, compressed, or executable-looking payloads in test/fixture/hidden paths.

tests/test_selector.pyView on unpkg

bin/multiacc-selectView file

•stage = ast_semantic_analysis; reason = ast_parse_error; limitedFiles = 1

High

Semantic Analysis Limited

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

bin/multiacc-selectView on unpkg

bin/claudeView file

•matchType = previous_version_dangerous_delta matchedPackage = claude-multiacc@2.0.19 matchedIdentity = npm:Y2xhdWRlLW11bHRpYWNj:2.0.19 similarity = 0.400 summary = stored previous version shares package body but lacks this dangerous source file

High

Previous Version Dangerous Delta

This package version adds a dangerous source file absent from the previous stored version; route for source-aware review.

bin/claudeView on unpkg

scripts/postinstall.mjsView file

Lines 1-33javascript

1#!/usr/bin/env node

2// Runs after `npm install`. On a GLOBAL install/update it wires the addon up by

3// running install.sh (idempotent), so `npm i -g claude-multiacc@latest` fully updates

4// the shim, CLI, and scheduled jobs with no extra step. Deliberately best-effort:

5// npm's own CI, sandboxes, and non-global/dev installs must never be broken by it, and

6// a failed install.sh must not fail `npm install` — it only prints how to finish by hand.

7import { spawnSync } from 'node:child_process';

8import { fileURLToPath }