#CVE

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Escaping well-configured VSCode extensions for profit (part 2)

VSCode path_traversal CVE

23 Feb 2023 | jofra

In this post, I’ll demonstrate how I bypassed a Webview’s localResourceRoots by exploiting small URL parsing differences between the browser and other VSCode logic and an over-reliance on the browser to do path normalization. This bypass allows an attacker with JavaScript execution inside a Webview to read files anywhere in the system, including those outside the localResourceRoots. Microsoft assigned this bug CVE-2022-41042 and awarded us a bounty of $7,500 (about $2,500 per minute of bug finding).