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amicus@4.14.0: AI-agent control-surface risk | LPM Firewall

registry / amicus / 4.14.0

amicus@4.14.0

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AI Security Review

scanned 13d ago · by lpm-firewall-ai

LPM flags this version as an AI-agent control-surface risk. On npm install, postinstall registers this package as a user-scoped Claude MCP server and copies skills into the Claude skills directory. The MCP command pulls amicus@latest through npx, so the agent keeps launching a floating release.

Static reason

High-risk behavior combination matched malicious policy.; source matched previously finalized malicious package; routed for review

Trigger

npm install lifecycle postinstall, which runs unless AMICUS_SKIP_POSTINSTALL=1.

Impact

A consumer install mutates the user Claude Code and Claude Desktop control surface without a consent prompt and leaves a persistent MCP entry that can execute a later package release inside the agent.

Mechanism

scripts/postinstall.js calls skill install plus registerClaudeCode and registerClaudeDesktop. Those paths run claude mcp add-json --scope user or write ~/.claude.json and claude_desktop_config.json with command npx and args -y amicus@latest mcp, and copy skill files under ~/.claude/skills.

Policy narrative

Installing amicus runs postinstall, which copies skills into the user Claude skills folder and registers an MCP server named amicus in Claude Code user scope and in Claude Desktop config. The entry launches npx -y amicus@latest mcp, so the agent will fetch and run whatever release that tag points at. There is an environment skip flag, but the default install path writes the agent control surface with no prompt.

AI rationale

The install hook unconditionally writes a foreign, user-scoped Claude MCP registration and skill files, and pins that registration to a floating amicus@latest command. That is unconsented postinstall mutation of a broad AI-agent control surface.

Evidence

package.jsonscripts/postinstall.jssrc/utils/claude-register.js~/.claude.json

Source & flagged code

18 flagged · loading source

package.jsonView file

•scripts.postinstall = node scripts/postinstall.js

High

Install Time Lifecycle Scripts

Package defines install-time lifecycle scripts.

package.jsonView on unpkg

•scripts.postinstall = node scripts/postinstall.js

Medium

Ambiguous Install Lifecycle Script

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

package.jsonView on unpkg

bin/amicus.jsView file

10// Node version guard: fail fast on unsupported Node versions L11: const { checkNodeVersion } = require('../src/utils/node-version-guard'); L12: const _nv = checkNodeVersion(process.version);

Medium

Dynamic Require

Package source references dynamic require/import behavior.

bin/amicus.jsView on unpkg · L10

src/utils/claude-register.jsView file

1Install-time code directly mutates a foreign AI-agent control surface: L8: * (src/cli-handlers-init.js) — e.g. after a failed postinstall, a L9: * plugin-channel / --ignore-scripts install, or to repair deleted ~/.claude L10: * state. ... L47: function skillsRoot() { L48: return path.join(os.homedir(), '.claude', 'skills'); L49: } ... L80: L81: if (!existing.mcpServers) { existing.mcpServers = {}; } L82: L83: const prev = existing.mcpServers[name]; L84: const nextConfig = (prev && isAmicusMcpConfig(prev)) ? { ...prev, ...config } : config; ... L86: Write operation from src/sidecar/electron-exe-rel.js: L127: function writePathTxt({ electronDir, platform, fs }) { L128: fs.writeFileSync(path.join(electronDir, 'path.txt'), platformExe(platform)); L129: } Foreign user/project scope from src/

Critical

Ai Agent Control Hijack

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

src/utils/claude-register.jsView on unpkg · L1

•Manifest-trigger-reachable source links an external AI-agent control path to a behavior-bearing write operation. erwrite' }, { file: 'manual-orchestration.md', mode: 'overwrite' }, { file: 'model-notes.md', mode: 'if-missing' }, ]; function skillsroot() { return path.join(os.homedir(), '.claude', 'skills'); } const mcp_config = { command: 'npx', args: ['-y', 'amicus@latest', 'mcp'] };

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/utils/claude-register.jsView on unpkg

electron/setup-ui.js#virtual:normalized:round1View file

•stage = ast_semantic_analysis; reason = ast_parse_error; limitedFiles = 44

High

Semantic Analysis Limited

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

electron/setup-ui.js#virtual:normalized:round1View on unpkg

src/sidecar/unzip.jsView file

•matchType = normalized_sha256 matchedPackage = amicus@4.9.7 matchedPath = src/sidecar/unzip.js matchedIdentity = npm:YW1pY3Vz:4.9.7 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.

src/sidecar/unzip.jsView on unpkg

src/mcp-server.jsView file

•matchType = normalized_sha256 matchedPackage = amicus@4.9.7 matchedPath = src/mcp-server.js matchedIdentity = npm:YW1pY3Vz:4.9.7 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.

src/mcp-server.jsView on unpkg

src/utils/engine-install-scan.jsView file

•matchType = normalized_sha256 matchedPackage = amicus@4.9.7 matchedPath = src/utils/engine-install-scan.js matchedIdentity = npm:YW1pY3Vz:4.9.7 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.

src/utils/engine-install-scan.jsView on unpkg

src/sidecar/interactive.jsView file

•matchType = normalized_sha256 matchedPackage = amicus@4.9.7 matchedPath = src/sidecar/interactive.js matchedIdentity = npm:YW1pY3Vz:4.9.7 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.

src/sidecar/interactive.jsView on unpkg

src/observe/on-complete.jsView file

•matchType = normalized_sha256 matchedPackage = amicus@4.9.7 matchedPath = src/observe/on-complete.js matchedIdentity = npm:YW1pY3Vz:4.9.7 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.

src/observe/on-complete.jsView on unpkg

src/sidecar/electron-install.jsView file

•matchType = normalized_sha256 matchedPackage = amicus@4.9.7 matchedPath = src/sidecar/electron-install.js matchedIdentity = npm:YW1pY3Vz:4.9.7 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.

src/sidecar/electron-install.jsView on unpkg

src/sidecar/electron-provision.jsView file

•matchType = normalized_sha256 matchedPackage = amicus@4.9.7 matchedPath = src/sidecar/electron-provision.js matchedIdentity = npm:YW1pY3Vz:4.9.7 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.

src/sidecar/electron-provision.jsView on unpkg

src/sidecar/electron-repair-cache.jsView file

•matchType = normalized_sha256 matchedPackage = amicus@4.9.7 matchedPath = src/sidecar/electron-repair-cache.js matchedIdentity = npm:YW1pY3Vz:4.9.7 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.

src/sidecar/electron-repair-cache.jsView on unpkg

src/sidecar/workspace-window.jsView file

•matchType = normalized_sha256 matchedPackage = amicus@4.9.7 matchedPath = src/sidecar/workspace-window.js matchedIdentity = npm:YW1pY3Vz:4.9.7 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.

src/sidecar/workspace-window.jsView on unpkg

src/utils/updater.jsView file

•matchType = normalized_sha256 matchedPackage = amicus@4.9.7 matchedPath = src/utils/updater.js matchedIdentity = npm:YW1pY3Vz:4.9.7 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.

src/utils/updater.jsView on unpkg

src/cli-handlers-doctor.jsView file

•matchType = token_shingles matchedPackage = amicus@4.9.7 matchedPath = src/cli-handlers-doctor.js matchedIdentity = npm:YW1pY3Vz:4.9.7 similarity = 1.000 shingleOverlap = 48 summary = source token shingles overlapped finalized malicious source

High

Known Malware Source Similarity

Source file is highly similar to a previously finalized malicious package; route for source-aware review.

src/cli-handlers-doctor.jsView on unpkg

src/utils/update-notice.jsView file

•matchType = normalized_sha256 matchedPackage = amicus@4.9.7 matchedPath = src/utils/update-notice.js matchedIdentity = npm:YW1pY3Vz:4.9.7 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.

src/utils/update-notice.jsView on unpkg