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yaver-cli@1.99.439: Malicious npm security report (Block) | LPM Firewall

registry / yaver-cli / 1.99.439

yaver-cli@1.99.439

Unified npm bootstrap for the Yaver agent, SDK injection, and local-first developer runtime

AI Security Review

scanned 4h ago · by lpm-firewall-ai

A global npm install automatically downloads and executes a release-selected binary, changes host configuration, and configures third-party AI coding runners. These actions occur without an explicit setup command.

Static reason

High-risk behavior combination matched malicious policy.; source matched previously finalized malicious package; routed for review; source fingerprint signature matched known malicious package; routed for review; previous stored version diff introduced dangerous source

Trigger

Installing the package globally through npm.

Impact

It can install additional tools, alter shell and kernel settings, restart services, and register an MCP integration in installed coding runners.

Mechanism

Postinstall bootstrap executes remote agent commands and mutates shell, system, and AI-agent configuration.

Attack narrative

The package's npm postinstall hook activates on global installation. It obtains a binary selected from remote release metadata, runs it for provisioning, alters shell startup files and Linux kernel settings, and invokes MCP setup against installed Claude Code, Codex, and OpenCode clients. This is an unconsented install-time modification of foreign AI-agent control surfaces combined with remote payload execution.

Rationale

Automatic postinstall behavior changes foreign AI-agent configuration and broad host settings while fetching and executing a remote binary. This meets the install-hook abuse blocking threshold.

Evidence

package.jsonsrc/postinstall.jssrc/agent-runtime.js/etc/sysctl.d/99-yaver-runner-sandbox.conf~/.bashrc~/.zshrc~/.profile~/.zshenv

Source & flagged code

23 flagged · loading source

package.jsonView file

•scripts.postinstall = node src/postinstall.js

High

Install Time Lifecycle Scripts

Package defines install-time lifecycle scripts.

package.jsonView on unpkg

•stage = ast_semantic_analysis; reason = ast_parse_error; limitedFiles = 4

High

Semantic Analysis Limited

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

package.jsonView on unpkg

•scripts.postinstall = node src/postinstall.js

Medium

Ambiguous Install Lifecycle Script

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

package.jsonView on unpkg

src/hermesc-runtime.jsView file

24const https = require("https"); L25: const { spawnSync } = require("child_process"); L26:

High

Child Process

Package source references child process execution.

src/hermesc-runtime.jsView on unpkg · L24

23const path = require("path"); L24: const https = require("https"); L25: const { spawnSync } = require("child_process"); L26: L27: const HERMES_RN_VERSION = process.env.YAVER_HERMES_RN_VERSION || "0.81.5"; L28:

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/hermesc-runtime.jsView on unpkg · L23

•matchType = normalized_sha256 matchedPackage = yaver-cli@1.99.438 matchedPath = src/hermesc-runtime.js matchedIdentity = npm:eWF2ZXItY2xp:1.99.438 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/hermesc-runtime.jsView on unpkg

src/postinstall.jsView file

554// runners are ordinary npm globals and must not disappear merely because L555: // the install came from PowerShell. L556: if (!envEnabled("YAVER_SKIP_POSTINSTALL_RUNNERS")) {

High

Shell

Package source references shell execution.

src/postinstall.jsView on unpkg · L554

10Trigger-reachable persistence chain: scripts.postinstall -> src/postinstall.js L10: const { ensureHermesc } = require("./hermesc-runtime"); L11: const { execFileSync, execSync, spawnSync } = require("child_process"); L12: const fs = require("fs"); ... L29: function envEnabled(name) { L30: const raw = String(process.env[name] || "").trim().toLowerCase(); L31: return raw === "1" || raw === "true" || raw === "yes"; ... L49: function commandExists(name) { L50: const probe = process.platform === "win32" L51: ? spawnSync("where.exe", [name], { stdio: "ignore", windowsHide: true }) L52: : spawnSync("/bin/sh", ["-c", `command -v ${name}`], { stdio: "ignore" }); L53: return !probe.error && probe.status === 0; ... L321:

High

Trigger Reachable Persistence

A manifest entrypoint or package-local install chain reaches persistence behavior.

src/postinstall.jsView on unpkg · L10

150if (typeof process.geteuid !== "function" || process.geteuid() !== 0) { L151: log("linux/arm64 hermesc build needs cmake/ninja/clang/libicu-dev — re-run `npm install -g yaver-cli` as root to provision them, or install manually."); L152: return; ... L158: } L159: execSync("apt-get update -y", { stdio: ["ignore", "ignore", "ignore"] }); L160: execSync(`DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends ${required.join(" ")}`, {

High

src/analyzer.jsView file

•matchType = normalized_sha256 matchedPackage = yaver-cli@1.99.438 matchedPath = src/analyzer.js matchedIdentity = npm:eWF2ZXItY2xp:1.99.438 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/analyzer.jsView on unpkg

1const fs = require('fs'); L2: const semver = require('semver');

Medium

Dynamic Require

Package source references dynamic require/import behavior.

src/analyzer.jsView on unpkg · L1

src/commands/desktop.jsView file

15const fs = require("node:fs"); L16: const https = require("node:https"); L17: const os = require("node:os"); L18: const path = require("node:path"); L19: const { spawn, spawnSync } = require("node:child_process"); L20: const { pipeline } = require("node:stream/promises"); ... L50: L51: function normalizedArch(arch = process.arch) { L52: if (arch === "x64" || arch === "amd64") return "x64"; ... L95: L96: function installedDesktopCandidates(platform = process.platform, env = process.env, home = os.homedir()) { L97: if (platform === "darwin") {

Critical

Download Execute

Source downloads or fetches remote code and executes it.

src/commands/desktop.jsView on unpkg · L15

15Trigger-reachable chain: scripts.postinstall -> src/postinstall.js -> src/commands/desktop.js L15: const fs = require("node:fs"); L16: const https = require("node:https"); L17: const os = require("node:os"); L18: const path = require("node:path"); L19: const { spawn, spawnSync } = require("node:child_process"); L20: const { pipeline } = require("node:stream/promises"); ... L50: L51: function normalizedArch(arch = process.arch) { L52: if (arch === "x64" || arch === "amd64") return "x64"; ... L95: L96: function installedDesktopCandidates(platform = process.platform, env = process.env, home = os.homedir()) { L97: if (platform === "darwin") {

Critical

Trigger Reachable Dangerous Capability

A package entrypoint or install-time lifecycle script reaches a source file with blocking dangerous behavior.

src/commands/desktop.jsView on unpkg · L15

•matchType = normalized_sha256 matchedPackage = yaver-cli@1.99.438 matchedPath = src/commands/desktop.js matchedIdentity = npm:eWF2ZXItY2xp:1.99.438 similarity = 1.000 summary = normalized source hash matched finalized malicious source

hermesc/darwin-x64/hermescView file

•path = hermesc/darwin-x64/hermesc kind = native_binary sizeBytes = 6297624 magicHex = [redacted]

Medium

Ships Native Binary

Package ships native binary artifacts.

hermesc/darwin-x64/hermescView on unpkg

src/agent-runtime.jsView file

•matchType = previous_version_dangerous_delta matchedPackage = yaver-cli@1.99.332 matchedIdentity = npm:eWF2ZXItY2xp:1.99.332 similarity = 0.857 summary = stored previous version shares package body but lacks this dangerous source file

Critical

Previous Version Dangerous Delta

This package version adds a dangerous source file absent from the previous stored version; route for source-aware review.

src/agent-runtime.jsView on unpkg

•matchType = normalized_sha256 matchedPackage = yaver-cli@1.99.438 matchedPath = src/agent-runtime.js matchedIdentity = npm:eWF2ZXItY2xp:1.99.438 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/agent-runtime.jsView on unpkg

•matchType = malicious_source_fingerprint_signature signature = b886796cd40a3435 signatureType = suspicious_hashes sourceLabel = final_verdict:malicious matchedPackage = yaver-cli@1.99.438 matchedPath = src/agent-runtime.js matchedIdentity = npm:eWF2ZXItY2xp:1.99.438 similarity = 1.000 shingleOverlap = 25 summary = package final verdict is malicious

High

Known Malware Source Fingerprint Signature

Source fingerprint signature matches a known malicious package signature; route for source-aware review.

src/agent-runtime.jsView on unpkg

src/commands/run.jsView file

•matchType = normalized_sha256 matchedPackage = yaver-cli@1.99.438 matchedPath = src/commands/run.js matchedIdentity = npm:eWF2ZXItY2xp:1.99.438 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/run.jsView on unpkg

src/update-check.jsView file

•matchType = normalized_sha256 matchedPackage = yaver-cli@1.99.438 matchedPath = src/update-check.js matchedIdentity = npm:eWF2ZXItY2xp:1.99.438 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/update-check.jsView on unpkg

src/transport.jsView file

•matchType = normalized_sha256 matchedPackage = yaver-cli@1.99.438 matchedPath = src/transport.js matchedIdentity = npm:eWF2ZXItY2xp:1.99.438 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/transport.jsView on unpkg