Exposure of Sensitive Information

Successful exploitation of the vulnerability could allow an unauthenticated attacker to gain access to a victim’s Sync account data such as account credentials and email protection information.

The DuckDuckGo browser 7.64.4 on iOS allows Address Bar Spoofing due to mishandling of the JavaScript window.open function (used to open a secondary browser window). This could be exploited by tricking users into supplying sensitive information such as credentials, because the address bar would display a legitimate URL, but content would be hosted on the attacker's web site.

The DuckDuckGo application through 5.58.0 for Android, and through 7.47.1.0 for iOS, sends hostnames of visited web sites within HTTPS .ico requests to servers in the duckduckgo.com domain, which might make visit data available temporarily at a Potentially Unwanted Endpoint. NOTE: the vendor has stated "the favicon service adheres to our strict privacy policy.

In the WebRTC component in DuckDuckGo 4.2.0, after visiting a web site that attempts to gather complete client information (such as https://ip.voidsec.com), the browser can disclose a private IP address in a STUN request.