@ubnt/cawcut@0.6.1

CawCut developer CLI — auth, generate, app run, task status

AI Security Review

scanned 10d ago · by lpm-firewall-ai

Source confirms automatic first-party agent skill setup during global installation and some CLI invocations, so the capability warrants a warning. The inspected behavior is bounded to CawCut skills and does not support a publish block.

Static reason

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

Trigger

A global npm install runs postinstall unless setup is skipped; a later ordinary CLI invocation can also install missing skills.

Impact

The setup adds CawCut skills that can affect how those agents behave; the inspected source does not establish broader control-surface changes.

Mechanism

The package launches npx skills add for the CawCut skill repository, targeting Cursor, Claude Code, and Codex global skill directories.

AI rationale

Evidence

package.jsondist/postinstall.jsdist/lib/is-global-install.jsdist/lib/skills-install.jsdist/lib/skills-agents.jsdist/lib/bootstrap-skills.js~/.cursor/skills~/.claude/skills~/.codex/skills~/.agents/skills

Network endpoints1

github.com (cawcut/skill)

Decision evidence

public snapshot

AI called this Suspicious at 93.0% confidence as Dangerous Capability with medium false-positive risk.

Evidence for warning

package.json runs dist/postinstall.js during postinstall.
The postinstall setup skips local installs; it also skips when CAWCUT_SKIP_SETUP=1 or CI=true.
The installer runs npx skills add with global installation flags and defaults to the cawcut/skill repository.
The default target agents are Cursor, Claude Code, and Codex, with their global skill directories under the user’s home directory.
On ordinary CLI invocation, missing CawCut skills can also be installed automatically, subject to the setup skip and command checks.

Evidence against

The inspected setup is limited to named CawCut skills from a CawCut repository and specific global skill directories.
The inspected source does not establish broad agent configuration mutation, credential transfer, or arbitrary payload execution.

Behavioral surface

Source

ChildProcessCryptoEnvironmentVarsFilesystemNetworkShell

Supply chain

Source & flagged code

6 flagged

package.jsonView file

Lines 1-40json

2 "name": "@ubnt/cawcut",

3 "version": "0.6.1",

4 "description": "CawCut developer CLI \u2014 auth, generate, app run, task status",

5 "type": "module",

6 "bin": {

7 "cawcut": "dist/index.js"

8 },

9 "main": "dist/index.js",

10 "files": [

11 "dist",

12 "config",

13 "assets"

14 ],

15 "scripts": {

16 "build:ts": "node scripts/build.mjs",

17 "build": "npm run build:ts",

18 "build:internal": "node scripts/build.mjs --profile internal",

19 "prepare": "npm run build",

20 "postinstall": "node dist/postinstall.js",

High

Install Time Lifecycle Scripts

Package defines install-time lifecycle scripts.

package.jsonView on unpkg · L20

Medium

Ambiguous Install Lifecycle Script

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

package.jsonView on unpkg · L20

21 "reinstall:global": "npm uninstall -g @ubnt/cawcut && npm install -g . --foreground-scripts --allow-scripts=@ubnt/cawcut",

22 "test": "vitest run",

23 "verify:package": "node scripts/verify-npm-package.mjs",

24 "release:check": "npm run test && npm run build && npm run verify:package",

25 "prepublishOnly": "node scripts/assert-release-ci.mjs && npm run release:check"

26 },

27 "dependencies": {

28 "commander": "^13.1.0"

29 },

30 "devDependencies": {

31 "@types/node": "^22.15.0",

32 "typescript": "^5.8.3",

33 "vitest": "^3.1.4"

34 },

35 "engines": {

36 "node": ">=20"

37 },

38 "license": "MIT"

39}

dist/lib/vn-media.jsView file

Lines 1-21javascript

1import { createHash } from "node:crypto";

2import { execFile } from "node:child_process";

3import { copyFile, mkdir, open, readFile, stat } from "node:fs/promises";

Low

Weak Crypto

Package source references weak cryptographic algorithms.

dist/lib/vn-media.jsView on unpkg · L1

dist/lib/skills-agents.jsView file

Lines 1-21javascript

1import { existsSync } from "node:fs";

2import { homedir } from "node:os";

Critical

Ai Agent Control Hijack

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

dist/lib/skills-agents.jsView on unpkg · L1

3import { join } from "node:path";

dist/lib/vn-pack.js#virtual:normalized:round1View file

•stage = ast_semantic_analysis; reason = ast_parse_error; limitedFiles = 2

High

Semantic Analysis Limited

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

dist/lib/vn-pack.js#virtual:normalized:round1View on unpkg

dist/lib/is-global-install.jsView file

•matchType = normalized_sha256 matchedPackage = @ubnt/cawcut@0.1.5 matchedPath = dist/lib/is-global-install.js matchedIdentity = npm:QHVibnQvY2F3Y3V0:0.1.5 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.

dist/lib/is-global-install.jsView on unpkg

Source & flagged code

6 flagged · loading source

package.jsonView file

•scripts.postinstall = node dist/postinstall.js

High

Install Time Lifecycle Scripts

Package defines install-time lifecycle scripts.

package.jsonView on unpkg

•scripts.postinstall = node dist/postinstall.js

Medium

Ambiguous Install Lifecycle Script

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

package.jsonView on unpkg

dist/lib/vn-media.jsView file

1import { createHash } from "node:crypto"; L2: import { execFile } from "node:child_process"; L3: import { copyFile, mkdir, open, readFile, stat } from "node:fs/promises"; ... L419: async function probeWithPlatformTool(filePath) { L420: if (process.platform === "darwin") { L421: try { L422: const { stdout } = await execFileAsync("/usr/bin/afinfo", [filePath], { timeout: 10_000 }); L423: const match = stdout.match(/estimated duration:\s*([\d.]+)\s*sec/i);

Low

Weak Crypto

Findings

1 Critical3 High4 Medium6 Low

CriticalAi Agent Control Hijackdist/lib/skills-agents.js

HighInstall Time Lifecycle Scriptspackage.json

HighSemantic Analysis Limiteddist/lib/vn-pack.js#virtual:normalized:round1

HighKnown Malware Source Similaritydist/lib/is-global-install.js

MediumAmbiguous Install Lifecycle Scriptpackage.json

MediumNetwork

MediumEnvironment Vars

MediumStructural Risk Force Deep Review

LowNon Install Lifecycle Scripts

LowScripts Present

LowWeak Cryptodist/lib/vn-media.js

LowFilesystem

LowHigh Entropy Strings

LowUrl Strings

Affected versions and remediation

This report applies to @ubnt/cawcut@0.6.1.

See all versions of @ubnt/cawcut for other recorded verdicts.

Review the evidence and your use of @ubnt/cawcut@0.6.1 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: 2026-10-12 21:10:17.997Z (UTC).

Think this verdict is wrong? Dispute it on GitHub or read how reports are produced.