registry / AI-agent capability abuse / @jacebenson/jsn / 4.2.4

@jacebenson/jsn@4.2.4

A command-line interface for ServiceNow that follows the Unix philosophy: simple, composable, and scriptable.

AI Security Review

scanned 2mo ago · by lpm-firewall-ai

No concrete malware, installation hook, credential exfiltration, or silent persistence was found. The explicit remote AI-skill installation capability warrants a warning under the firewall policy.

Static reason

One or more suspicious static signals were detected.; source matched previously finalized malicious package; routed for review; previous stored version diff introduced dangerous source

Trigger

The user runs jsn skill install, optionally selecting a target or all targets.

Impact

Remote instruction content can affect the behavior of an agent that loads the installed skill.

Mechanism

Downloads a GitHub skill file and writes it to selected agent skill locations.

AI rationale

No concrete malware, installation hook, credential exfiltration, or silent persistence was found. The explicit remote AI-skill installation capability warrants a warning under the firewall policy.

Evidence

package.jsonsrc/cli.jssrc/commands/skill.jsskills/servicenow/SKILL.mdsrc/auth.jssrc/sdk.jsscripts/release.js

Network endpoints1

raw.githubusercontent.com/jacebenson/jsn/main/skills/servicenow/SKILL.md

Decision evidence

public snapshot

AI called this Suspicious at 90.0% confidence as Dangerous Capability with medium false-positive risk.

Evidence for warning

The explicit skill-install command downloads remote content and writes it into selected AI agent skill directories.
The command can target several agent products or all supported targets, extending the remote content across agent control surfaces.

Evidence against

package.json has no preinstall, install, or postinstall lifecycle hook.
The agent-file mutation requires the user to run the skill install command.
The normal CLI check only compares local skill versions and records a timestamp; it does not install a skill.
The bundled skill gives ServiceNow CLI guidance and includes confirmation rules for destructive operations.

Behavioral surface

Source

ChildProcessCryptoEnvironmentVarsFilesystemNetworkShell

Supply chain

HighEntropyStringsMinifiedTelemetryUrlStrings

Manifest

Source & flagged code

7 flagged

scripts/release.jsView file

Lines 1-21javascript

1#!/usr/bin/env node

2import { execSync } from 'child_process';

3import { readFileSync } from 'fs';

High

Child Process

Package source references child process execution.

scripts/release.jsView on unpkg · L1

4import { fileURLToPath } from 'url';

5import { dirname, join } from 'path';

7const __dirname = dirname(fileURLToPath(import.meta.url));

8const pkg = JSON.parse(readFileSync(join(__dirname, '..', 'package.json'), 'utf8'));

10const type = process.argv[2];

11if (!type || !['patch', 'minor', 'major'].includes(type)) {

12 console.error('Usage: npm run release -- <patch|minor|major>');

13 process.exit(1);

14}

16let branch;

17try {

18 branch = execSync('git rev-parse --abbrev-ref HEAD', { encoding: 'utf8' }).trim();

19} catch {

20 console.error('Error: Not in a git repository');

21 process.exit(1);

•matchType = normalized_sha256 matchedPackage = @jacebenson/jsn@3.3.1 matchedPath = scripts/release.js matchedIdentity = npm:QGphY2ViZW5zb24vanNu:3.3.1 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.

scripts/release.jsView on unpkg

src/commands/skill.jsView file

Lines 1-39javascript

1import fs from 'node:fs';

2import path from 'node:path';

3import os from 'node:os';

4import process from 'node:process';

scripts/pre-commit-check.shView file

•path = scripts/pre-commit-check.sh kind = build_helper sizeBytes = 1784 magicHex = [redacted]

Medium

Ships Build Helper

Package ships non-JavaScript build or shell helper files.

scripts/pre-commit-check.shView on unpkg

src/commands/docs/public/vendor/marked.min.jsView file

•matchType = normalized_sha256 matchedPackage = @jacebenson/jsn@3.3.1 matchedPath = [redacted].min.js matchedIdentity = npm:QGphY2ViZW5zb24vanNu:3.3.1 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/commands/docs/public/vendor/marked.min.jsView on unpkg

src/auth.jsView file

•matchType = previous_version_dangerous_delta matchedPackage = @jacebenson/jsn@4.2.2 matchedIdentity = npm:QGphY2ViZW5zb24vanNu:4.2.2 similarity = 0.892 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.

src/auth.jsView on unpkg

Source & flagged code

7 flagged · loading source

scripts/release.jsView file

1#!/usr/bin/env node L2: import { execSync } from 'child_process'; L3: import { readFileSync } from 'fs';

High

Child Process

Package source references child process execution.

scripts/release.jsView on unpkg · L1

High

Known Malware Source Similarity

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

scripts/release.jsView on unpkg

src/commands/skill.jsView file

19L20: const SKILL_RAW_URL = 'https://raw.githubusercontent.[redacted].md'; L21: ... L29: try { L30: const result = execSync('getent passwd ' + process.env.USER + ' 2>/dev/null', { encoding: 'utf-8', timeout: 3000 }); L31: const home = result.trim().split(':')[5];

Findings

7 High4 Medium5 Low

HighChild Processscripts/release.js

HighShell

HighSame File Env Network Executionsrc/commands/skill.js

HighSandbox Evasion Gated Capabilitysrc/commands/skill.js

HighKnown Malware Source Similarityscripts/release.js

HighKnown Malware Source Similaritysrc/commands/docs/public/vendor/marked.min.js

HighPrevious Version Dangerous Deltasrc/auth.js

MediumNetwork

MediumEnvironment Vars

MediumShips Build Helperscripts/pre-commit-check.sh

MediumStructural Risk Force Deep Review

LowScripts Present

LowFilesystem

LowHigh Entropy Strings

Affected versions and remediation

This report applies to @jacebenson/jsn@4.2.4.

See all versions of @jacebenson/jsn for other recorded verdicts.

Review the evidence and your use of @jacebenson/jsn@4.2.4 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: 2026-08-27 21:32:56.599Z (UTC).

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

AI Security Review

Decision evidence

Source & flagged code

Source & flagged code

Findings

Affected versions and remediation

Runtime surface

Behavioral surface

Source & flagged code