registry / AI-agent capability abuse / pennyrouter / 0.3.20

pennyrouter@0.3.20

Install and manage PennyRouter local coding-agent integrations.

AI Security Review

scanned 11d ago · by lpm-firewall-ai

Source inspection found a user-invoked agent configuration capability that installs a statusline wrapper, which merits a warning under the agent integration policy. The source did not establish a concrete attack or an automatic npm installation trigger.

Static reason

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

Trigger

A user invokes the PennyRouter harness configuration flow.

Impact

The integration changes agent behavior-bearing configuration and can run the configured statusline command through the wrapper; source inspection did not establish credential theft, stealth, or unconsented install-time mutation.

Mechanism

The setup function configures a package-owned statusline script and assigns its command in the Claude settings object, retaining an existing command as a wrapped command.

AI rationale

Evidence

src/statusline.jssrc/launch.js

Decision evidence

public snapshot

AI called this Suspicious at 78.0% confidence as Dangerous Capability with medium false-positive risk.

Evidence for warning

The manifest exposes a CLI entry point and has no preinstall, install, or postinstall script.
Claude statusline configuration is explicitly invoked by the package's harness setup flow.
The statusline setup preserves a user command by wrapping it and changes the settings object to invoke PennyRouter's script.
The launcher derives agent configuration paths from the user's home or configured Codex home.
The Codex and Claude session helpers map to their expected local session directories.
CodeGPT setup is manual and reports no configuration file to mutate.
Inspected integration tests use temporary home directories for fixture configuration.
The CLI imports child process and filesystem APIs; these imports alone do not establish malicious behavior.

Evidence against

Behavioral surface

Source

ChildProcessCryptoEnvironmentVarsFilesystemNetworkShell

Supply chain

HighEntropyStrings

Source & flagged code

7 flagged

src/launch.test.jsView file

1import assert from "node:assert/strict"; L2: import { spawnSync } from "node:child_process"; L3: import fs from "node:fs"; ... L47: async function main() { L48: if (!(["darwin", "linux"].includes(process.platform))) { L49: console.log("launch.test.js: skipped on unsupported platform"); ... L53: const root = fs.mkdtempSync(path.join(os.tmpdir(), "pr-launch-test-")); L54: const previous = Object.fromEntries(ENV_KEYS.map((key) => [key, process.env[key]])); L55: const home = path.join(root, "home"); ... L61: }, null, 2)}\n`; L62: const nativeCodex = 'model = "native-model"\n\nmodel_provider = "pennyrouter"\n\n[model_providers.pennyrouter]\nname = "PennyRouter"\nbase_url = "http://localhost:8400/v1"\n'; L63: 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

src/launch.jsView file

•Manifest-trigger-reachable source links an external AI-agent control path to a behavior-bearing write operation. desktop_profile_id = "70656e6e-7972-4f75-8465-720000000001"; const claude_desktop_profile_name = "pennyrouter"; const terminal_title_refresh_ms = 1000; const terminal_status_refresh_ms = 15000; export function pennyconfigdir() { if (process.platform === "win32") { return join(process.env.appdata || process.env.localappdata || homedir(), "pennyrouter"); } return join(process.env.xdg_config_home || join(homedir(), ".config"), "pennyrouter"); } export function pennyconfigpath() { return join(pennyconfigdir(), "config.json"); } export function pennydatadir() { if (process.platform === "win32") { return join(process.env.localappdata || process.env.appdata || home

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/harnesses/codex.js#virtual:normalized:round1View file

•stage = ast_semantic_analysis; reason = ast_parse_error; limitedFiles = 3

High

Semantic Analysis Limited

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

src/harnesses/codex.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 = 0.806 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

7 flagged · loading source

src/launch.test.jsView file

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

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/harnesses/codex.js#virtual:normalized:round1

HighPrevious Version Dangerous Deltasrc/cli.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@0.3.20.

See all versions of pennyrouter for other recorded verdicts.

Review the evidence and your use of pennyrouter@0.3.20 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 19:03:25.141Z (UTC).

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