@a11ign/screenreader-worker@0.9.0
Drives a real NVDA screen reader through real navigation on Windows and returns what it announced. The HTTP contract is the API.
AI Security Review
scanned 5d ago · by lpm-firewall-aiThe server’s normal startup automatically invokes Windows trimming, which can make elevated, security-reducing system changes. This is concrete destructive behavior and supports blocking publication.
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 server begins listening on Windows, unless trimming is skipped or its marker indicates it already ran.
Impact
This can remove system apps, stop services including Windows Update, and reduce malware protection.
Mechanism
The helper may hand off trimming to an elevated scheduled task, then changes Windows app, service, and Defender settings.
Attack narrative
On Windows, starting the server launches a detached trimming helper by default. The helper can obtain elevated execution through a scheduled task, remove selected provisioned apps, disable services, and disable Defender real-time monitoring. These changes affect system security and availability.
AI rationale
The server’s normal startup automatically invokes Windows trimming, which can make elevated, security-reducing system changes. This is concrete destructive behavior and supports blocking publication.
Evidence
package.jsondist/server.mjsdist/windows-trim.mjs.windows-trimmed.windows-trimmed.log.windows-trimmed.json
Decision evidence
public snapshotAI called this Malicious at 99.0% confidence as Malware with low false-positive risk.
Evidence for block
- The package exposes the server as a command-line executable.
- When the server starts on Windows, it launches the trimming helper unless the skip variable is set or a marker already exists.
- The helper can request an elevated scheduled task when it lacks administrator rights.
- The elevated helper removes selected provisioned apps and disables configured Windows services.
- The helper also turns off Windows Defender real-time monitoring.
Evidence against
- The helper limits these actions to Windows and records a marker after trimming.
Behavioral surface
ChildProcessCryptoEnvironmentVarsFilesystemNetworkWebSocket
HighEntropyStringsMinified
CopyleftLicense
Source & flagged code
6 flagged · loading sourcedist/windows-trim.mjsView file
1import { execFileSync } from "node:child_process";
L2: import { readFileSync, writeFileSync } from "node:fs";
High
Child Process
Package source references child process execution.
dist/windows-trim.mjsView on unpkg · L1dist/server.mjsView file
•matchType = previous_version_dangerous_delta
matchedPackage = @a11ign/screenreader-worker@0.5.0
matchedIdentity = npm:[redacted]:0.5.0
similarity = 0.522
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.
dist/server.mjsView on unpkg1Cross-file remote execution chain: dist/server.mjs spawns dist/src_capture-core_ts.mjs; helper contains network access plus dynamic code execution.
L1: import { createServer } from "node:http";
L2: import { appendFileSync, existsSync, openSync, readFileSync, readdirSync, renameSync, statSync, statfsSync, writeFileSync } from "node:fs";
L3: import { execFile, execFileSync, spawn } from "node:child_process";
L4: import { promisify } from "node:util";
...
L7: import { extname, join, resolve as external_node_path_resolve } from "node:path";
L8: import { inflateRawSync } from "node:zlib";
L9: import { rm } from "node:fs/promises";
...
L22: function powershellValue(script) {
L23: if ("win32" !== process.platform) return "unknown";
L24: try {
...
L47: try {
L48: const { stdout } = await execFileA
Findings
1 Critical5 High2 Medium4 Low
CriticalPrevious Version Dangerous Deltadist/server.mjs
HighChild Processdist/windows-trim.mjs
HighCross File Remote Execution Contextdist/server.mjs
HighKnown Malware Source Similaritydist/src_capture-core_ts.mjs
HighKnown Malware Source Similaritydist/src_auth-flow_ts.mjs
HighAi Review Evidencepackage.json
MediumNetwork
MediumEnvironment Vars
LowScripts Present
LowFilesystem
LowHigh Entropy Strings
LowCopyleft License
Affected versions and remediation
This report applies to @a11ign/screenreader-worker@0.9.0.
See all versions of @a11ign/screenreader-worker for other recorded verdicts.
- Avoid installing @a11ign/screenreader-worker@0.9.0. Remove it from direct dependencies and check your lockfile for transitive copies.
- Choose an independently verified alternative or release. This report does not establish that other versions are safe.
- If this version ran, investigate the affected machine and build environment. Rotate credentials it could access and rebuild from a trusted environment.
Evidence last updated: .
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