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By James Forshaw, Project Zero In my previous blog post I discussed an issue with the Windows Kernel’s handling of Restricted Tokens which allowed me to escape the Chrome GPU sandbox. Originally I’d planned to use Firefox for the proof-of-concept as Firefox uses the same effective sandbox level as the Chrome GPU process for its content renderers. That means a FF content RCE would give code execution in a sandbox where you could abuse the Windows Kernel Restricted Tokens issue, making it much more serious.