The Chromium super (inline cache) type confusion

The text explores the exploitation of CVE-2022-1134, a type confusion vulnerability in V8, the JavaScript engine for Chrome, allowing remote code execution within Chrome's renderer sandbox upon visiting a malicious site. The vulnerability resides in the SuperIC feature, a component with a history of exploitable issues, and involves complex interactions between V8 and Blink, Chrome's rendering engine. The document details the optimization processes of inline caching in V8, describing how this caching speeds up property access through dynamic profiling and optimization. It highlights the intricacies of JavaScript's super property access and the caching mechanisms that can lead to vulnerabilities. The text also delves into the technical nuances of exploiting these vulnerabilities, including constructing primitives for arbitrary read and write operations by leveraging Blink objects like DOMRectReadOnly and DeviceMotionEvent. It underscores the critical need to understand both V8 and Blink's interactions to uncover and exploit such vulnerabilities, pointing out the sophisticated expertise required by attackers, as evidenced by similar exploitations in other contexts like the high-profile Tianfu Cup. The document concludes with reflections on the necessity for research focused on the intersection of V8 and Blink in vulnerability discovery.

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