registry / Credential exfiltration / pennyrouter / 0.3.41

pennyrouter@0.3.41

Install and manage PennyRouter local coding-agent integrations.

AI Security Review

scanned 11d ago · by lpm-firewall-ai

The refresh code sends an existing PennyRouter key to a configurable base URL without validating the destination. This is a conditional credential exposure risk; the inspected source does not establish theft or a malicious recipient.

Static reason

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

Trigger

The installed statusline runs its refresh mode with a session ID, configured base URL, and PennyRouter key.

Impact

If the configured base URL is untrusted or incorrect, the key may be disclosed to that destination.

Mechanism

It reads the base URL and key from Claude settings or process environment, then sends the key in an authentication header to the status endpoint formed from that base URL.

AI rationale

Evidence

src/statusline.js~/.claude/settings.json

Decision evidence

public snapshot

AI called this Suspicious at 86.0% confidence as Dangerous Capability with medium false-positive risk.

Evidence for warning

The installed statusline reads an existing PennyRouter key and a base URL from Claude settings or the process environment.
When the statusline refresh runs, it sends that key in an authentication header to a URL built from the configured base, without restricting the destination.
The refresh is gated on a session ID, base URL, and key; it is a package-provided statusline integration.
The manifest exposes a command-line entry point and has no install lifecycle hook.

Evidence against

The request uses the PennyRouter status endpoint and fetches status data; inspected source does not show collection of unrelated credentials or files.
The integration writes behavior-bearing agent configuration through the package’s installer and statusline setup.

Behavioral surface

Source

ChildProcessCryptoEnvironmentVarsFilesystemNetworkShellWebSocket

Supply chain

HighEntropyStrings

Source & flagged code

10 flagged

standalone/web-demo/server.mjsView file

3import { mkdtemp, readFile, rm, stat, writeFile } from 'node:fs/promises'; L4: import { spawn, execFile } from 'node:child_process'; L5: import { join, dirname, resolve } from 'node:path';

High

Child Process

Package source references child process execution.

standalone/web-demo/server.mjsView on unpkg · L3

304server.listen(port, '127.0.0.1', () => { L305: const url = `http://127.0.0.1:${port}`; L306: console.log(`Penny Compare live terminal demo: ${url}`); ... L310: if (process.platform === 'win32') { L311: execFile(process.env.ComSpec || 'cmd.exe', ['/d', '/s', '/c', `start "" "${url}"`], L312: { windowsHide: true }, (error) => {

High

Same File Env Network Execution

A single source file combines environment access, network access, and code or shell execution; review context before blocking.

standalone/web-demo/server.mjsView on unpkg · L304

src/launch.jsView file

368const body = process.platform === "win32" L369: // `node` and the native harnesses are normally npm .cmd shims on Windows. cmd.exe L370: // resolves those through PATHEXT, while Node's direct spawn does not.

High

Shell

Package source references shell execution.

src/launch.jsView on unpkg · L368

•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

src/launch.test.jsView file

1import assert from "node:assert/strict"; L2: import { spawnSync } from "node:child_process"; L3: import fs from "node:fs"; ... L53: async function main() { L54: if (!(["darwin", "linux"].includes(process.platform))) { L55: console.log("launch.test.js: skipped on unsupported platform"); ... L59: const root = fs.mkdtempSync(path.join(os.tmpdir(), "pr-launch-test-")); L60: const previous = Object.fromEntries(ENV_KEYS.map((key) => [key, process.env[key]])); L61: const home = path.join(root, "home"); ... L67: }, null, 2)}\n`; L68: const nativeCodex = 'model = "native-model"\n\nmodel_provider = "pennyrouter"\n\n[model_providers.pennyrouter]\nname = "PennyRouter"\nbase_url = "http://localhost:8400/v1"\n'; L69: 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

src/harnesses/codegpt.jsView file

1import { spawnSync } from "node:child_process"; L2: ... L52: L53: // The record carries the base URL this install actually wrote, so a private/self-hosted L54: // gateway is named here instead of the hosted default the user never configured. ... L58: console.log(" Open CodeGPT settings and remove or replace the PennyRouter provider:"); L59: console.log(` - Base URL: ${record?.changes?.base_url || "https://api.pennyrouter.com/v1"}`); L60: console.log(" - API Key: pr-..."); ... L66: const commands = L67: process.platform === "darwin" L68: ? [["pbcopy"]] L69: : process.platform === "win32"

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

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

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

src/cli.jsView file

•matchType = previous_version_dangerous_delta matchedPackage = pennyrouter@0.3.17 matchedIdentity = npm:cGVubnlyb3V0ZXI:0.3.17 similarity = 0.710 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/cli.jsView on unpkg

Source & flagged code

10 flagged · loading source

standalone/web-demo/server.mjsView file

3import { mkdtemp, readFile, rm, stat, writeFile } from 'node:fs/promises'; L4: import { spawn, execFile } from 'node:child_process'; L5: import { join, dirname, resolve } from 'node:path';

High

Child Process

Package source references child process execution.

standalone/web-demo/server.mjsView on unpkg · L3

High

Same File Env Network Execution

A single source file combines environment access, network access, and code or shell execution; review context before blocking.

standalone/web-demo/server.mjsView on unpkg · L304

src/launch.jsView file

Findings

8 High5 Medium4 Low

HighChild Processstandalone/web-demo/server.mjs

HighShellsrc/launch.js

HighSame File Env Network Executionstandalone/web-demo/server.mjs

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/cli.js

MediumNetwork

MediumEnvironment Vars

MediumInstall Persistencesrc/launch.test.js

MediumShips Build Helperstandalone/claude-proxy.sh

Affected versions and remediation

This report applies to pennyrouter@0.3.41.

See all versions of pennyrouter for other recorded verdicts.

Review the evidence and your use of pennyrouter@0.3.41 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 19:05:09.494Z (UTC).

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