LAN port scan forbidder

Forbid non-LAN web to access LAN

LAN Port Scan Forbidder Extension

LAN port scan forbidder is a Chrome extension that safeguards your local network by preventing untrusted websites from accessing your LAN and scanning for open ports. It protects against tracking fingerprint and allows you to disable the extension for specific tabs or windows if needed.
Install from Chrome Web Store

Extension stats

Users: 464
113
Version: 0.6.2 (Last updated: 2024-03-23)
Creation date: 2021-12-25
Risk impact: High risk impact
Risk likelihood:
Manifest version: 2
Permissions:
  • webRequest
  • webRequestBlocking
  • *://*/*
  • ws://*/*
  • wss://*/*
  • ftp://*/*
  • contextMenus
  • storage
Size: 38.39K

Other platforms

Not available on Android
Not available on Firefox
Not available on Edge
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Extension summary

Forbid untrusted web to scan localhost or LAN.

Source Code Repo

https://github.com/garywill/LAN-port-scan-forbidder

What

Webs can try to fetch 127.0.0.1:xxxx or 192.168.Y.Z:xxxx to scan your open ports in LAN.

Although browsers have cross-domain protections, webs can't read response contents, but can still see the connection succeeds or fails.

There're already reports that some websites using that as tracking fingerprint.

A web for testing: http://samy.pl/webscan/

See more

Extension safety

Risk impact

LAN port scan forbidder requires some sensitive permissions that could impact your browser and data security. Exercise caution before installing.

Risk likelihood

LAN port scan forbidder is probably trust-worthy. Prefer other publishers if available. Exercise caution when installing this extension.

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Promo images

LAN port scan forbidder small promo image
Small promo image

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