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u-foo@3.0.31: AI-agent control-surface risk | LPM Firewall

registry / u-foo / 3.0.31

u-foo@3.0.31

Multi-Agent Workspace Protocol. Just add u. claude → uclaude, codex → ucodex.

AI Security Review

scanned 3h ago · by lpm-firewall-ai

LPM flags this version as an AI-agent control-surface risk. Installation silently replaces named Claude/Codex skill directories with package-controlled symlinks. Those skills authorize injected work, while the runtime can type commands into tmux panes.

Static reason

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

Trigger

npm postinstall

Impact

Unconsented control of installed agent instruction surfaces and interactive agent terminals.

Mechanism

foreign AI-agent skill installation plus command injection

Policy narrative

On npm installation, the package removes existing named skill paths and symlinks its own skills into global Claude and Codex skill directories without user action. The installed instructions treat direct bus injections as work and direct immediate execution; the included runtime can send commands to tmux panes. This is an unconsented postinstall mutation of broad foreign AI-agent control surfaces.

Rationale

Concrete postinstall code mutates global Claude and Codex skill roots and installs instructions that accept injected work. This meets the firewall block threshold regardless of the absence of lifecycle network exfiltration.

Evidence

package.jsonscripts/postinstall.jsSKILLS/ufoo/SKILL.mdsrc/coordination/bus/inject.jsSKILLS/ufooSKILLS/ufoo-busSKILLS/ufoo-contextSKILLS/ufoo-online~/.claude/skills/<name>${CODEX_HOME:-~/.codex}/skills/<name>

Source & flagged code

15 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/ufoo.jsView file

94L95: const { execSync } = require("child_process"); L96: const path = require("path");

High

Child Process

Package source references child process execution.

bin/ufoo.jsView on unpkg · L94

bin/ukimi.jsView file

13L14: const AgentLauncher = require("../src/agents/launch/launcher"); L15: const { resolveDefaultManualBootstrap } = require("../[redacted]");

Medium

Dynamic Require

Package source references dynamic require/import behavior.

bin/ukimi.jsView on unpkg · L13

src/runtime/projects/projectId.jsView file

1const crypto = require("crypto"); L2: const fs = require("fs");

Low

Weak Crypto

Package source references weak cryptographic algorithms.

src/runtime/projects/projectId.jsView on unpkg · L1

src/coordination/bus/inject.jsView file

1const { spawn, spawnSync } = require("child_process"); L2: const fs = require("fs"); L3: const net = require("net"); L4: const path = require("path"); ... L7: L8: const SHOULD_LOG_INJECT = process.env.UFOO_INJECT_DEBUG === "1"; L9: const logInject = (message) => {

High

Same File Env Network Execution

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

src/coordination/bus/inject.jsView on unpkg · L1

•matchType = token_shingles matchedPackage = u-foo@3.0.24 matchedPath = src/coordination/bus/inject.js matchedIdentity = npm:dS1mb28:3.0.24 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/coordination/bus/inject.jsView on unpkg

src/agents/providers/claudeThreadProvider.jsView file

31package = u-foo; repositoryIdentity = ufoo; dependency = @anthropic-ai/claude-agent-sdk L31: try { L32: return await import("@anthropic-ai/claude-agent-sdk"); L33: } catch (err) {

High

Copied Package Dependency Bridge

Package metadata claims a different repository identity while copied source loads a runtime dependency bridge.

src/agents/providers/claudeThreadProvider.jsView on unpkg · L31

scripts/postinstall.jsView file

74function installSkillDirs(targetDir, sources, label) { L75: fs.mkdirSync(targetDir, { recursive: true }); L76: ... L84: // Install ufoo skills for Claude and Codex at npm install time. L85: // - Claude skills: ~/.claude/skills/<name> -> skill dir L86: // - Codex skills: ${CODEX_HOME:-~/.codex}/skills/<name> -> skill dir L87: try { ... L90: const sources = collectSkillSources(pkgRoot); L91: const codexHome = process.env.CODEX_HOME || path.join(home, ".codex"); L92: const retiredLinks = [redacted]({ pkgRoot, home, codexHome }); ... L98: if (sources.length > 0) { L99: installSkillDirs(path.join(home, ".claude", "skills"), sources, "~/.claude/skills");

Critical

Ai Agent Control Hijack

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

scripts/postinstall.jsView on unpkg · L74

•Manifest-trigger-reachable source links an external AI-agent control path to a behavior-bearing write operation. es", "node-pty", "prebuilds", platform, "spawn-helper" ); if (fs.existssync(spawnhelperpath)) { const stats = fs.statsync(spawnhelperpath); if ((stats.mode & 0o111) === 0) { fs.chmodsync(spawnhelperpath, 0o755); console.log(`[postinstall] fixed node-pty spawn-helper permissions (${platform})`); } } } catch { } } try { const plat = `${process.platform}-${process.arch}`; const tuibin = path.join(__dirname, "..", "dist", "tui", plat, "ufoo-tui"); if (

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.

scripts/postinstall.jsView on unpkg

dist/tui/linux-arm64/ufoo-tuiView file

•path = dist/tui/linux-arm64/ufoo-tui kind = native_binary sizeBytes = 2131600 magicHex = [redacted]

Medium

Ships Native Binary

Package ships native binary artifacts.

dist/tui/linux-arm64/ufoo-tuiView on unpkg

src/coordination/bus/index.jsView file

•matchType = normalized_sha256 matchedPackage = u-foo@3.0.24 matchedPath = src/coordination/bus/index.js matchedIdentity = npm:dS1mb28:3.0.24 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/coordination/bus/index.jsView on unpkg

src/runtime/daemon/mcpServer.jsView file

•matchType = normalized_sha256 matchedPackage = u-foo@3.0.24 matchedPath = src/runtime/daemon/mcpServer.js matchedIdentity = npm:dS1mb28:3.0.24 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/runtime/daemon/mcpServer.jsView on unpkg

src/runtime/daemon/ops.jsView file

•matchType = token_shingles matchedPackage = u-foo@3.0.24 matchedPath = src/runtime/daemon/ops.js matchedIdentity = npm:dS1mb28:3.0.24 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/runtime/daemon/ops.jsView on unpkg

src/agents/launch/ptyWrapper.jsView file

•matchType = normalized_sha256 matchedPackage = u-foo@3.0.24 matchedPath = src/agents/launch/ptyWrapper.js matchedIdentity = npm:dS1mb28:3.0.24 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/agents/launch/ptyWrapper.jsView on unpkg