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CreepJS

https://abrahamjuliot.github.io/creepjs

The purpose of this project is to shed light on weaknesses and privacy leaks among modern anti-fingerprinting extensions and browsers.

  1. Detect and ignore API tampering (API lies)
  2. Fingerprint lie types
  3. Fingerprint extension code
  4. Fingerprint browser privacy settings
  5. Employ large-scale validation, but allow possible inconsistencies
  6. Feature detect and fingerprint new APIs that reveal high entropy
  7. Rely only on APIs that are the most difficult to spoof when generating a pure fingerprint

Tests are focused on:

  • Tor Browser (SL 1 & 2)
  • Firefox (RFP)
  • ungoogled-chromium (fingerprint deception)
  • Brave Browser (Standard/Strict)
  • puppeteer-extra
  • uBlock Origin (aopr)
  • NoScript
  • DuckDuckGo Privacy Essentials
  • Privacy Badger
  • Privacy Possom
  • Random User-Agent
  • User Agent Switcher and Manager
  • CanvasBlocker
  • Trace
  • CyDec
  • Chameleon
  • ScriptSafe
  • Windscribe

Rules

Data

  • data collected: user agent string, encrypted fingerprints and booleans
  • data retention: auto deletes 30 days after last visit
  • visit tracking: limited to data retention and new feature scaling

Signatures

  • you may optionally sign your fingerprint with 4-64 characters
  • signatures can be memorable descriptors
  • in low entropy browsers, a signature can signal to others that the fingerprint is shared

New feature scaling

  • scaling should occur no more than once per week
  • new weekly features may render fingerprints anew
  • view deploy history

Formulas

Trust Score

A failing trust score is unique and can be used to connect fingerprints.

  • start at 100%
  • less than 2 loose fingerprints: subtract 0
  • less than 11 loose fingerprints: subtract total*0.1
  • *11+ loose fingerprints: subtract total*0.2
  • trash: subtract total*15.5
  • lies: subtract total*31
  • errors: subtract total*5.2

Bot Detection

Bots leak unusual behavior and can be denied service.

  • 10 loose fingerprints within 48 hours
  • Headless rating > 0
  • Stealth rating > 0

Version Detection

  • a guess attempt is made to decrypt the browser vendor, version, renderer, engine, and platform
  • this guess does not affect the fingerprint
  • system is collected from WorkerNavigator.userAgent and auto matched to fingerprint ids
  • decoded samples are auto computed and manually reviewed if new
  • if the worker scope is blocked and the fingerprint ids exist in the database, the version can still be detected

Tests

  1. js Math implementation
  2. js engine via console errors
  3. HTMLElement version
  4. system styles
  5. CSS style version
  6. contentWindow version

Supported

  • layout rendering engines: Gecko, Goanna, Blink, WebKit
  • JS runtime engines: SpiderMonkey, JavaScriptCore, V8

Definitions

Trash

  • unusual results
  • forgivable lies
  • failed calculations that may reasonably occur at random (loose fingerprint metrics)

Lies

  • prototype tampering
  • mismatch in worker scope or iframe
  • failed math calculations

Errors

  • ungracefully blocked features that break the web
  • failed executions

Loose Fingerprint

  • collects as much entropy as possible

Fingerprint

  • adapts to browsers and distrusts known noise vectors
  • aims to ignore entropy unique to a browser version release
  • gathers compressed and static entropy