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Porter Felt: The “core” is the most powerful part of the extension, so a vulnerability in an extension core yields the most privileges to an attacker. Kassner: The paper seems particularly concerned about extension-core vulnerabilities. We then built attacks to demonstrate the vulnerabilities truly existed. I then reviewed each of the potential vulnerabilities to ensure they were real. Teampaper snap chrome code#Then, he read and searched through the extensions’ source code to find any attacks. First, he would exercise the user interfaces of the extensions while monitoring their network traffic. Porter Felt: I worked with a fantastic undergraduate student at Cal named Nicholas Carlini. ![]() ![]() Kassner: Could you briefly explain how you determined if an extension was vulnerable? If an attacker compromises an extension, the attacker can get access to this personal information, too. Porter Felt: Extensions are fairly powerful - they can read users’ browsing history, passwords, email, etc. Why is it important to make sure extensions are not vulnerable? The set of vulnerable extensions includes 7 extensions with more than 300,000 users each.” “27 of the 100 extensions contain one or more vulnerabilities, for a total of 51 vulnerabilities. Kassner: You reviewed 100 Chrome extensions: If an extension has a core vulnerability, the attacker will only gain access to the permissions the vulnerable extension already has. Permissions: Each extension comes packaged with a list of permissions, which govern access to the browser APIs and web domains.Isolated worlds: Content scripts can read and modify website content, but content scripts and websites have separate program heaps so websites cannot access content scripts’ functions or variables. Teampaper snap chrome full#Extension cores do not directly interact with websites and execute with the extension’s full privileges. Content scripts interact with websites and execute with no privileges.
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