Vulnerability Spotlight: Remote code execution vulnerability in Firefox’s Shared Worker Service function

Summary: Cisco Talos's Marcin "Icewall" Noga discovered a vulnerability in Mozilla Firefox's SharedWorkerService function, present in version 76.0a1 (2020-04-01) x64, that can lead to remote code execution. A specially crafted HTML page triggers a race condition leading to a use-after-free, and the victim must visit a malicious web site to trigger it; Talos worked with Mozilla to resolve the issue and make an update available.
Bottom line: Exploitation requires only that a user visit a malicious web page, so a single browsing session on an unpatched Firefox build is enough to hand an attacker code execution on the machine.

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Topics: Cloud Security
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