registry / u-foo / 3.0.25

u-foo@3.0.25

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

AI Security Review

scanned 4d ago · by lpm-firewall-ai

LPM treats this as warn-only first-party agent extension lifecycle risk. npm postinstall creates global Claude and Codex skill entries and replaces pre-existing paths with matching names. Those package-controlled skills can influence agent behavior when loaded.

Static reason

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

Trigger

npm installation

Impact

Unconsented first-party agent-extension setup and possible overwrite of same-named user skill entries.

Mechanism

install-time replacement of Claude/Codex skill entries with package symlinks

Rationale

Source confirms an install-time mutation of AI-agent skill directories, including destructive replacement of colliding paths. It warrants a warning under the first-party extension lifecycle policy, not a block.

Evidence

package.jsonscripts/postinstall.jsSKILLS/ufoo-bus/SKILL.md~/.claude/skills/<name>${CODEX_HOME:-~/.codex}/skills/<name>

Decision evidence

public snapshot

AI called this Suspicious at 94.0% confidence as Dangerous Capability with medium false-positive risk.

Evidence for warning

package.json runs scripts/postinstall.js at npm install.
Postinstall removes an existing skill path recursively, then symlinks package-controlled skills.
Postinstall automatically targets both Claude and Codex global skill directories.
Installed ufoo skill instructs agents to execute delivered bus tasks immediately.

Evidence against

Lifecycle code contains no network request or credential collection.
Skill sources are package-owned ufoo directories; MCP config writing is in an explicit CLI operation.

Behavioral surface

Source

ChildProcessCryptoDynamicRequireEnvironmentVarsFilesystemNetworkShellWebSocket

Supply chain

HighEntropyStringsUrlStrings

Manifest

NoLicense

scanned 360 file(s), 2.65 MB of source, external domains: api.anthropic.com, api.kimi.com, api.openai.com, auth.kimi.com, auth.openai.com, chatgpt.com, online.ufoo.dev

Source & flagged code

15 flagged

package.jsonView file

Lines 30-70json

30 "ukimi": "bin/ukimi.js",

31 "ucode": "bin/ucode.js"

32 },

33 "files": [

34 "bin/",

35 "src/",

36 "templates/",

37 "online/",

38 "scripts/",

39 "dist/tui/",

40 "SKILLS/",

41 "OPTIONAL_SKILLS/",

42 "LICENSE",

43 "README.md"

44 ],

45 "type": "commonjs",

46 "engines": {

47 "node": ">=18"

48 },

49 "scripts": {

50 "postinstall": "node scripts/postinstall.js",

High

Install Time Lifecycle Scripts

Package defines install-time lifecycle scripts.

package.jsonView on unpkg · L50

Medium

Ambiguous Install Lifecycle Script

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

package.jsonView on unpkg · L50

51 "pack:tui": "node scripts/pack-tui.js",

52 "prepack": "node scripts/pack-tui.js --check",

53 "test": "jest",

54 "test:watch": "jest --watch",

55 "test:coverage": "jest --coverage"

56 },

57 "dependencies": {

58 "@anthropic-ai/claude-agent-sdk": "^0.2.138",

59 "@modelcontextprotocol/sdk": "^1.30.0",

60 "@openai/codex-sdk": "^0.145.0",

61 "@xterm/addon-serialize": "^0.14.0",

62 "@xterm/headless": "^6.0.0",

63 "chalk": "^4.1.2",

64 "commander": "^13.1.0",

65 "gray-matter": "^4.0.3",

66 "node-pty": "^1.1.0",

67 "ws": "^8.19.0"

68 },

69 "devDependencies": {

70 "jest": "^30.2.0"

bin/ufoo.jsView file

Lines 74-114javascript

74 }

75 if (cmd === "chat") {

76 await runChat(chatProjectRoot, { globalMode });

77 return;

78 }

80 // Handle resume command to resume/launch agent sessions

bin/ukimi.jsView file

Lines 1-33javascript

1#!/usr/bin/env node

2/**

3 * ukimi: Launch Kimi Code CLI (kimi) and auto-join event bus

4 *

5 * Usage: ukimi [kimi args...]

6 *

7 * Differences vs uclaude:

8 * - kimi has no --append-system-prompt style flag, so the default

9 * bootstrap is delivered via post-launch PTY injection (same model as

10 * ucodex's UFOO_STARTUP_BOOTSTRAP_TEXT path).

11 * - Session resume uses kimi's own session ids via `--session <id>`.

src/runtime/projects/projectId.jsView file

Lines 1-21javascript

1const crypto = require("crypto");

2const fs = require("fs");

Low

Weak Crypto

Package source references weak cryptographic algorithms.

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

3const

src/coordination/bus/inject.jsView file

Lines 1-21javascript

1const { spawn, spawnSync } = require("child_process");

2const fs = require("fs");

3const net

src/agents/providers/claudeThreadProvider.jsView file

Lines 11-51javascript

11const CACHE_CONTROL = Object.freeze({ type: "ephemeral" });

13function createThreadId() {

14 return `claude-thread-${Date.now().toString

scripts/postinstall.jsView file

Lines 54-94javascript

54 sources.push({ name: entry.name, dir: path.join(topSkills, entry.name) });

55 }

56 }

57 }

58 }

59 return sources;

60}

62function forceSymlink

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

•path = dist/tui/darwin-arm64/ufoo-tui kind = native_binary sizeBytes = 1888288 magicHex = [redacted]

Medium

Ships Native Binary

Package ships native binary artifacts.

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

src/agents/launch/launcher.jsView file

•matchType = normalized_sha256 matchedPackage = u-foo@3.0.24 matchedPath = src/agents/launch/launcher.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/launcher.jsView 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 = normalized_sha256 matchedPackage = u-foo@3.0.24 matchedPath = src/runtime/daemon/ops.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/ops.jsView on unpkg

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 = normalized_sha256 matchedPackage = u-foo@3.0.24 matchedPath = src/coordination/bus/inject.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/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/darwin-arm64/ufoo-tuiView file

•path = dist/tui/darwin-arm64/ufoo-tui kind = native_binary sizeBytes = 1888288 magicHex = [redacted]

Medium

Ships Native Binary

Package ships native binary artifacts.

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

src/agents/launch/launcher.jsView file

High

Known Malware Source Similarity

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

src/agents/launch/launcher.jsView on unpkg

src/coordination/bus/index.jsView file

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

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

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

Findings

1 Critical11 High6 Medium6 Low

CriticalAi Agent Control Hijackscripts/postinstall.js

HighInstall Time Lifecycle Scriptspackage.json

HighChild Processbin/ufoo.js

HighShell

HighSame File Env Network Executionsrc/coordination/bus/inject.js

HighCopied Package Dependency Bridgesrc/agents/providers/claudeThreadProvider.js

HighTrigger Reachable External Ai Agent Control Surface Mutationscripts/postinstall.js

HighKnown Malware Source Similaritysrc/agents/launch/launcher.js

HighKnown Malware Source Similaritysrc/coordination/bus/index.js

HighKnown Malware Source Similaritysrc/coordination/bus/inject.js

HighKnown Malware Source Similaritysrc/runtime/daemon/mcpServer.js

HighKnown Malware Source Similaritysrc/runtime/daemon/ops.js

MediumAmbiguous Install Lifecycle Scriptpackage.json

MediumDynamic Requirebin/ukimi.js

MediumNetwork

MediumEnvironment Vars

MediumShips Native Binarydist/tui/darwin-arm64/ufoo-tui

MediumStructural Risk Force Deep Review

LowScripts Present

LowWeak Cryptosrc/runtime/projects/projectId.js

LowFilesystem

LowHigh Entropy Strings

LowUrl Strings

LowNo License