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Plaintext leakage of DNS requests in Windows 1.1.1.1 WARP client

High
C
Cloudflare Public Bug Bounty
Submitted None

Team Summary

Official summary from Cloudflare Public Bug Bounty

The Cloudflare WARP client for Windows assigns loopback IPv4 addresses for the DNS Servers, since WARP acts as local DNS server that performs DNS queries in a secure manner, however, if a user is connected to WARP over an IPv6-capable network, te WARP client did not assign loopback IPv6 addresses but Unique Local Addresses, which under certain conditions could point towards unknown devices in the same local network which enables an Attacker to view DNS queries made by the device.

Reported by vanhoefm

Report Details

Additional information and metadata

State

Closed

Substate

Resolved

Submitted

Weakness

Cleartext Transmission of Sensitive Information