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yaver-cli@1.99.474: Malicious npm security report (Block) | LPM Firewall

registry / yaver-cli / 1.99.474

yaver-cli@1.99.474

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

AI Security Review

scanned 10h ago · by lpm-firewall-ai

The global postinstall can persistently weaken Linux user namespace restrictions while running as root. This changes host security settings automatically during installation.

Static reason

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

Trigger

Installing yaver-cli globally on Linux as root, unless postinstall is skipped by an environment flag.

Impact

The host’s sandbox isolation controls are relaxed, which can increase the impact of vulnerabilities in processes relying on those restrictions.

Mechanism

The postinstall writes /etc/sysctl.d/99-yaver-runner-sandbox.conf with unprivileged user namespaces enabled and AppArmor user namespace restrictions disabled when available, then invokes sysctl --system.

Attack narrative

A root global install automatically runs the postinstall hook. On Linux, it writes persistent sysctl settings that enable unprivileged user namespaces and can disable AppArmor’s user namespace restriction, then applies the settings system-wide. This weakens host isolation controls without requiring a separate setup command.

AI rationale

The root-only Linux configuration change is an automatic, persistent relaxation of sandbox protections in a postinstall hook. The global-install gate and opt-outs limit activation, but do not prevent the unconsented security-setting change on affected hosts.

Evidence

package.jsonsrc/postinstall.js/etc/sysctl.d/99-yaver-runner-sandbox.conf

Decision evidence

Source & flagged code

21 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

•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@1.99.470 matchedPath = src/hermesc-runtime.js matchedIdentity = npm:eWF2ZXItY2xp:1.99.470 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

583// runners are ordinary npm globals and must not disappear merely because L584: // the install came from PowerShell. L585: if (!envEnabled("YAVER_SKIP_POSTINSTALL_RUNNERS")) {

High

Shell

Package source references shell execution.

src/postinstall.jsView on unpkg · L583

10Trigger-reachable persistence chain: scripts.postinstall -> src/postinstall.js L10: const { ensureHermesc } = require("./hermesc-runtime"); L11: const { execFileSync, execSync, spawn, 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; ... L247: async function prepareHeadlessChromiumDogfood() {

High

Trigger Reachable Persistence

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

src/postinstall.jsView on unpkg · L10

129if (typeof process.geteuid !== "function" || process.geteuid() !== 0) { L130: 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."); L131: return; ... L137: } L138: execSync("apt-get update -y", { stdio: ["ignore", "ignore", "ignore"] }); L139: execSync(`DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends ${required.join(" ")}`, {

src/analyzer.jsView file

•matchType = normalized_sha256 matchedPackage = yaver-cli@1.99.470 matchedPath = src/analyzer.js matchedIdentity = npm:eWF2ZXItY2xp:1.99.470 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@1.99.470 matchedPath = src/commands/desktop.js matchedIdentity = npm:eWF2ZXItY2xp:1.99.470 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.js#virtual:normalized:round1View file

•stage = ast_semantic_analysis; reason = ast_parse_error; limitedFiles = 3

High

Semantic Analysis Limited

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

src/agent-runtime.js#virtual:normalized:round1View 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 = 0.762 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@1.99.470 matchedPath = src/agent-runtime.js matchedIdentity = npm:eWF2ZXItY2xp:1.99.470 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

src/commands/run.jsView file

•matchType = normalized_sha256 matchedPackage = yaver-cli@1.99.470 matchedPath = src/commands/run.js matchedIdentity = npm:eWF2ZXItY2xp:1.99.470 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@1.99.470 matchedPath = src/update-check.js matchedIdentity = npm:eWF2ZXItY2xp:1.99.470 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@1.99.470 matchedPath = src/transport.js matchedIdentity = npm:eWF2ZXItY2xp:1.99.470 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