Injecting malicious content at the upstream router when Tor is disabled in order to correlate Tor and non-Tor activity. Running exit nodes or controlling routers upstream of exit nodes. Reducing a Tor user's anonymity is also good for marketing purposes. Running websites or contracting ad space from adservers to inject content. Seeking timezone and locality information to determine if the user originates from a specific region they are trying to control, or focusing in on dissidents or whistleblowers.Īdversary Positioning Capabilities Seizing the computers of all Tor users in a given area and extracting history records, cache data, hostnames and disk-logged spoofed MAC address history. History Records and other On-disk Information Querying user history for censored search queries or websites. If a proxy bypass is not possible, correlation of Tor and non-Tor activity is sought via cookies, cache identifiers, JavaScript events and Cascading Style Sheets (CSS). Learning if the person who visited site A is the same person who visited site B, in order to serve targeted advertisements. To identify specific individuals, system data like the browser build, timezone or display resolution is used to track down (or at least track) their activities.ĭirectly compromising and bypassing Tor, or forcing connections to specific IP addresses.Ĭorrelating Activity across Multiple Sites Other security measures to address many of the risks outlined below.Long-term unlinkability via the 'New Identity' button.Cross-origin fingerprinting unlinkability.The Tor Browser design has carefully considered the goals, capabilities and types of attacks undertaken by adversaries and planned accordingly. 16 Multiple Tor Browser Instances and Workstations.15 Tor Browser Update: Technical Details.13 Platform-specific Issues: Whonix ™ Custom Linux Workstation.12.5.1 Option 1: Disposable Template Method.12.3 tb-updater in Qubes DisposableVM Template.12.2.6 Creating Whonix ™ Using the Build Script.12.2.3.1 Disable Automatic Update Downloads.12.1 Running Tor Browser in Qubes Template or Disposable Template.12 Platform-specific Issues: Qubes-Whonix ™.10 Local Connections Exception Threat Analysis.5.2 Get a New Identity without Tor ControlPort Access.3.1 Tor Browser AppArmor Permit Shared Folder.

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