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novahiz@0.4.1: AI-agent control-surface risk | LPM Firewall

registry / novahiz / 0.4.1

novahiz@0.4.1

Enforce AI agent skills before every file edit: prompt classifier, skill catalog, and pre-edit gate.

AI Security Review

scanned 3d ago · by lpm-firewall-ai

LPM flags this version as an AI-agent control-surface risk. An automatic npm postinstall changes the user's OpenCode control surface without confirmation. It also removes unrelated globally installed MCP packages when found.

Static reason

High-risk behavior combination matched malicious policy.; source matched previously finalized malicious package; routed for review; previous stored version diff introduced dangerous source

Trigger

Installing novahiz through npm with lifecycle scripts enabled.

Impact

Changes subsequent agent behavior and removes existing MCP tooling without a separate user setup action.

Mechanism

The postinstall passes --yes, suppresses the confirmation prompt, installs an OpenCode plugin, writes missing agent configuration, and invokes global npm uninstall commands.

Policy narrative

Installing the package automatically invokes its installer with confirmation bypassed. The installer targets the user's global OpenCode configuration, installs its plugin, and creates configuration when absent. It additionally checks for security-mcp and mcp-cron and removes them globally. These effects extend beyond package-owned extension setup into unconsented changes to another agent platform and unrelated tooling.

AI rationale

The inspected lifecycle chain performs unconsented mutation of OpenCode's global control surface and removes unrelated global MCP packages. This independently supports blocking, regardless of scanner similarity labels or citation coverage limits.

Evidence

package.jsoninstall/install.mjsinstall/lib.mjs.config/opencodenovahiz-plugin.tsopencode.jsonc

Decision evidence

Source & flagged code

16 flagged · loading source

package.jsonView file

•scripts.postinstall = node install/install.mjs --yes || exit 0

High

Install Time Lifecycle Scripts

Package defines install-time lifecycle scripts.

package.jsonView on unpkg

•scripts.postinstall = node install/install.mjs --yes || exit 0

Medium

Ambiguous Install Lifecycle Script

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

package.jsonView on unpkg

mcp/argus/tmp/argus/argus-results-1791138636150.jsonView file

11patternName = stripe_test_secret severity = high line = 11

High

High Secret

Package contains a high-severity secret pattern.

mcp/argus/tmp/argus/argus-results-1791138636150.jsonView on unpkg · L11

11patternName = stripe_test_secret severity = high line = 11

High

Secret Pattern

Stripe test secret key in mcp/argus/tmp/argus/argus-results-1791138636150.json

mcp/argus/tmp/argus/argus-results-1791138636150.jsonView on unpkg · L11

bin/novahiz.mjsView file

•matchType = previous_version_dangerous_delta matchedPackage = novahiz@0.4.0 matchedIdentity = npm:bm92YWhpeg:0.4.0 similarity = 0.992 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/novahiz.mjsView on unpkg

64L65: await import(pathToFileURL(target).href);

Medium

Dynamic Require

Package source references dynamic require/import behavior.

bin/novahiz.mjsView on unpkg · L64

install/bootstrap.mjsView file

5import { join, resolve } from "node:path"; L6: import { spawnSync } from "node:child_process"; L7: import { fileURLToPath } from "node:url"; ... L9: L10: const REPO_URL = "https://github.com/novahiz/novahiz.git"; L11: // Was hardcoded to ~/.config/novahiz, ignoring NOVAHIZ_HOME/NOVAHIZ_HOME. ... L15: function log(msg) { L16: process.stdout.write(`[Novahiz] ${msg}\n`); L17: } ... L24: // ENOENT (post-CVE-2024-* Node refuses to run .cmd via CreateProcess). The L25: // line handed to cmd.exe only contains tokens accepted by unsafeHostToken L26: // (lib.mjs — the install-side mirror of src/exec.ts SAFE_TOKEN, widened by

High

Sandbox Evasion Gated Capability

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

install/bootstrap.mjsView on unpkg · L5

install/install.mjsView file

1#!/usr/bin/env node L2: import { cpSync, existsSync, mkdirSync, readdirSync, statSync, writeFileSync } from "node:fs"; L3: import { homedir } from "node:os"; ... L53: const home = NovahizHome(flags); L54: const configDir = flags.scope === "project" ? resolve(".opencode") : opencodeConfigDir(); L55: const skillsDir = join(configDir, "skills"); ... L160: for (const name of configured) { L161: if (!existsSync(harnessDirs[name])) mkdirSync(harnessDirs[name], { recursive: true }); L162: } ... L172: note(`Copying core to ${home}`); L173: if (!dryRun) mkdirSync(home, { recursive: true }); L174: for (const item of CORE_ITEMS) {

Critical

Ai Agent Control Hijack

Source creates an unconsented AI-agent control surface through install-time mutation or a default unauthenticated remote skill channel.

install/install.mjsView on unpkg · L1

install/install.shView file

•path = install/install.sh kind = build_helper sizeBytes = 124 magicHex = [redacted]

Medium

Ships Build Helper

Package ships non-JavaScript build or shell helper files.

install/install.shView on unpkg

mcp/argus/src/test/test_vulnerable.pyView file

•path = mcp/argus/src/test/test_vulnerable.py kind = payload_in_excluded_dir sizeBytes = 451 magicHex = [redacted]

High

Payload In Excluded Dir

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

mcp/argus/src/test/test_vulnerable.pyView on unpkg

dist/commands/memory.js#virtual:normalized:round1View file

•stage = ast_semantic_analysis; reason = ast_parse_error; limitedFiles = 4

High

Semantic Analysis Limited

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

dist/commands/memory.js#virtual:normalized:round1View on unpkg

skills/llm-threat-review/scripts/llm_risk_lint.mjsView file

•matchType = normalized_sha256 matchedPackage = novahiz@0.2.5 matchedPath = skills/llm-threat-review/scripts/llm_risk_lint.mjs matchedIdentity = npm:bm92YWhpeg:0.2.5 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.

skills/llm-threat-review/scripts/llm_risk_lint.mjsView on unpkg

skills/secrets-hygiene/scripts/secret_scan.mjsView file

•matchType = normalized_sha256 matchedPackage = novahiz@0.2.5 matchedPath = skills/secrets-hygiene/scripts/secret_scan.mjs matchedIdentity = npm:bm92YWhpeg:0.2.5 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.

skills/secrets-hygiene/scripts/secret_scan.mjsView on unpkg

skills/skill-authoring/scripts/skill_frontmatter_lint.mjsView file

•matchType = normalized_sha256 matchedPackage = novahiz@0.2.5 matchedPath = skills/sk[redacted]/scripts/sk[redacted] matchedIdentity = npm:bm92YWhpeg:0.2.5 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.

skills/skill-authoring/scripts/skill_frontmatter_lint.mjsView on unpkg

skills/skill-eval-loop/scripts/skill_structure_check.mjsView file

•matchType = normalized_sha256 matchedPackage = novahiz@0.2.5 matchedPath = skills/sk[redacted]/scripts/sk[redacted] matchedIdentity = npm:bm92YWhpeg:0.2.5 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.

skills/skill-eval-loop/scripts/skill_structure_check.mjsView on unpkg

skills/ui-slop-remover/scripts/slop_lint.mjsView file

•matchType = normalized_sha256 matchedPackage = novahiz@0.2.5 matchedPath = skills/ui-slop-remover/scripts/slop_lint.mjs matchedIdentity = npm:bm92YWhpeg:0.2.5 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.

skills/ui-slop-remover/scripts/slop_lint.mjsView on unpkg