In GNOME Shell through 45.7, a portal helper can be launched automatically (without user confirmation) based on network responses provided by an adversary (e.g., an adversary who controls the local Wi-Fi network), and subsequently loads untrusted JavaScript code, which may lead to resource consumption or other impacts depending on the JavaScript code's behavior. A vulnerability was found in GNOME Shell. A portal helper can be launched automatically without user confirmation based on the network responses provided by an adversary.
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– Scott Cheney, Manager of Information Security, Sierra View Medical Center