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CVE-2023-5217 is a heap buffer overflow in the VP8 encoding logic of libvpx. The issue affects libvpx before 1.13.1 and Google Chrome prior to 117.0.5938.132, with downstream impact to Chromium-based consumers such as Electron and CefSharp that incorporated the vulnerable library. According to the provided content, the flaw can be triggered by malformed media data delivered through crafted HTML content, leading to heap corruption during VP8 encoding operations in libvpx.
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1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos.
This repository is a Proof-of-Concept (PoC) exploit for CVE-2023-5217, a heap buffer overflow vulnerability in the libvpx VP8 encoder, which is used by Chromium-based browsers (such as Google Chrome). The exploit demonstrates how a remote attacker can trigger a controlled heap overflow in the browser process by manipulating video encoding parameters via the WebCodecs and/or MediaRecorder APIs from JavaScript. The repository includes several HTML files (combined.html, mediarecorder.html, webcodecs.html) that serve as entry points for the exploit, a JavaScript worker (webcodecs.js) that performs the encoding logic, and scripts (server.py, gen_server_key.sh) to set up a local HTTPS server with a self-signed certificate. The exploit is effective against vulnerable versions of Chrome (e.g., 117.0.5938.131) and causes a browser tab crash, demonstrating the vulnerability but not achieving code execution. The README provides detailed technical background on the vulnerability, exploitation strategy, and testing instructions. No direct remote network endpoints are hardcoded, but the exploit is designed to be served locally over HTTPS (https://localhost:4443).
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