registry / AI-agent capability abuse / pennyrouter / 0.3.64

pennyrouter@0.3.64

Install and manage PennyRouter local coding-agent integrations.

AI Security Review

scanned 11d ago · by lpm-firewall-ai

The manifest exposes a CLI without install lifecycle hooks, while the explicit harness setup modifies Claude agent configuration and installs a package-owned statusline command. That capability merits a warning; the inspected source does not establish a concrete attack.

Static reason

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

Trigger

A user invokes the CLI harness setup flow; Claude Code later runs the configured statusline command.

Impact

The inspected source supports an agent configuration warning, but does not establish unconsented install-time mutation, credential theft, or other concrete attack behavior.

Mechanism

Setup points Claude Code’s statusLine setting at the package script. The statusline reads a PennyRouter key and gateway setting for status requests, and can wrap an existing user statusline command.

AI rationale

Evidence

src/launch.jssrc/statusline.js

Decision evidence

public snapshot

AI called this Suspicious at 81.0% confidence as Dangerous Capability with medium false-positive risk.

Evidence for warning

The manifest exposes a CLI and has no install, preinstall, or postinstall hook.
The Codex test writes fixture configuration and authentication data under a temporary test root.
The flagged launch location derives a PennyRouter Codex config path from CODEX_HOME or the user’s .codex directory.
The launch test creates Claude and Codex directories for its fixture.
The MCP registration test creates Codex configuration for a status check.
The pilots test creates Claude settings and a fixture file to test permission handling.
The statusline reads Claude settings and obtains its PennyRouter key from settings or process environment.
The Codex session path helper identifies where session files are stored.

Evidence against

The configured statusline can run a saved user command through a shell, as part of wrapping that user’s existing statusline.
The package contains network and environment-variable use; the inspected evidence does not establish a malicious recipient or credential theft.

Behavioral surface

Source

ChildProcess

Source & flagged code

7 flagged

src/launch.test.jsView file

Lines 1-21javascript

1import assert from "node:assert/strict";

2import { spawnSync } from "node:child_process";

3import fs from "node:fs";

Medium

Install Persistence

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

src/launch.test.jsView on unpkg · L1

4import os from "node:os";

5import path from "node:path";

7import {

8 buildPennyInvocation,

9 claudeDesktopConfigLibraryPath,

10 claudeDesktopCredentialHelperPath,

11 claudeLaunchSettingsPath,

12 claudeUserSkillPath,

13 codexLaunchProfilePath,

14 codexModelCatalogPath,

15 configureClaudeDesktopProfile,

16 createCodexDesktopHome,

17 configurePennyHarness,

18 fileMode,

19 installPennyCompare,

20 installPennyRuntime,

21 isClaudeDesktopRunning,

•matchType = previous_version_dangerous_delta matchedPackage = pennyrouter@0.3.63 matchedIdentity = npm:cGVubnlyb3V0ZXI:0.3.63 similarity = 0.986 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.

src/launch.test.jsView on unpkg

src/harnesses/codegpt.jsView file

Lines 1-21javascript

1import { spawnSync } from "node:child_process";

High

Sandbox Evasion Gated Capability

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

src/harnesses/codegpt.jsView on unpkg · L1

3export const codeGptHarness = {

4 id: "codegpt",

src/statusline.jsView file

•Runtime or CLI code links a write operation to an explicit external AI-agent control path: tatusline (all lines) |] penny segment (penny / penny (sub) // / penny (byok) / penny off). the wrapped statusline's first line gets the penny suffix; // any further lines (e.g. a context bar) pass through verbatim. // never blocks on the network: reads a per-session cache and refreshes it detached. import { readfilesync, mkdirsync, writefilesync, statsync } from "node:fs"; import { spawn, spawnsync } from "node:child_process"; import { join, basename } from "node:path"; import os from "node:os"; const statedir = join( process.env.xdg_state_home || join(os.homedir(), ".local", "state"), "pennyrouter", ); const cachedir = join(statedir, "statusline-cache"); const titlesessionfile = process.env.pe

High

External Ai Agent Control Surface Mutation

Runtime or CLI source writes behavior-bearing configuration into a user or project AI-agent control surface.

src/statusline.jsView on unpkg

src/launch.jsView file

•Manifest-trigger-reachable source links an external AI-agent control path to a behavior-bearing write operation. export function pennydatadir() { if (process.platform === "win32") { return join(process.env.localappdata || process.env.appdata || homedir(), "pennyrouter"); } return join(process.env.xdg_data_home || join(homedir(), ".local", "share"), "pennyrouter"); } export function pennyruntimedir() { return join(pennydatadir(), "runtime"); } export function pennycomparedir() { return join(pennydatadir(), "compare"); } export function pennybindir() { if (process.platform === "win32") return join(pennydatadir(), "bin"); return join(homedir(), ".local", "bin"); } export function pennyshimpath() { return join(pennybindir(), process.platform === "win32" ? "penny.cmd" :

High

Trigger Reachable External Ai Agent Control Surface Mutation

Manifest-trigger-reachable source writes behavior-bearing configuration into a user or project AI-agent control surface.

src/launch.jsView on unpkg

standalone/claude-proxy.shView file

•path = standalone/claude-proxy.sh kind = build_helper sizeBytes = 8224 magicHex = [redacted]

Medium

Ships Build Helper

Package ships non-JavaScript build or shell helper files.

standalone/claude-proxy.shView on unpkg

src/mcp-register.js#virtual:normalized:round1View file

•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.

src/mcp-register.js#virtual:normalized:round1View on unpkg

Source & flagged code

7 flagged · loading source

src/launch.test.jsView 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.

src/launch.test.jsView on unpkg

1import assert from "node:assert/strict"; L2: import { spawnSync } from "node:child_process"; L3: import fs from "node:fs"; ... L56: async function main() { L57: if (!(["darwin", "linux"].includes(process.platform))) { L58: console.log("launch.test.js: skipped on unsupported platform"); ... L62: const root = fs.mkdtempSync(path.join(os.tmpdir(), "pr-launch-test-")); L63: const previous = Object.fromEntries(ENV_KEYS.map((key) => [key, process.env[key]])); L64: const home = path.join(root, "home"); ... L70: }, null, 2)}\n`; L71: const nativeCodex = 'model = "native-model"\n\nmodel_provider = "pennyrouter"\n\n[model_providers.pennyrouter]\nname = "PennyRouter"\nbase_url = "http://localhost:8400/v1"\n'; L72: fs.writeFileSync(path.join(home, ".claude", "settings.json"), nativeClaude);

Medium

Install Persistence

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

src/launch.test.jsView on unpkg · L1

Findings

5 High5 Medium4 Low

HighSandbox Evasion Gated Capabilitysrc/harnesses/codegpt.js

HighExternal Ai Agent Control Surface Mutationsrc/statusline.js

HighTrigger Reachable External Ai Agent Control Surface Mutationsrc/launch.js

HighSemantic Analysis Limitedsrc/mcp-register.js#virtual:normalized:round1

HighPrevious Version Dangerous Deltasrc/launch.test.js

MediumNetwork

MediumEnvironment Vars

MediumInstall Persistencesrc/launch.test.js

MediumShips Build Helperstandalone/claude-proxy.sh

MediumStructural Risk Force Deep Review

LowScripts Present

LowFilesystem

LowHigh Entropy Strings

Affected versions and remediation

This report applies to pennyrouter@0.3.64.

See all versions of pennyrouter for other recorded verdicts.

Review the evidence and your use of pennyrouter@0.3.64 before allowing it. Restrict the permissions described in this report.
Choose an independently verified alternative or release. This report does not establish that other versions are safe.

Evidence last updated: 2026-10-11 20:48:57.808Z (UTC).

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