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CVE-2019-9810 is a buffer overflow vulnerability in the IonMonkey JIT compiler used by Firefox, Firefox ESR, and Thunderbird. The vulnerability arises from incorrect alias information handling for the Array.prototype.slice method, which can result in missing bounds checks and subsequent out-of-bounds memory writes. This flaw affects Firefox versions prior to 66.0.1, Firefox ESR prior to 60.6.1, and Thunderbird prior to 60.6.1.
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2 valid exploits after Mallory filtered fakes, detection scripts, and README-only repos (2 hidden).
This repository contains a proof-of-concept (PoC) exploit for CVE-2019-9810, a vulnerability in Mozilla Firefox's JavaScript engine related to incorrect aliasing in Array.prototype.slice. The exploit is implemented as a single HTML file (hello_firefox_11_30.html) containing embedded JavaScript. The code manipulates array lengths and uses Symbol.species to trigger a memory corruption condition when the file is opened in a vulnerable version of Firefox (prior to 66.0.1). The README provides a brief description of the bug and its fix version. No network endpoints, hardcoded IPs, or external resources are present. The exploit does not include a payload for code execution; it is a PoC demonstrating the vulnerability trigger.
This repository contains a full exploit for CVE-2019-9810, a vulnerability in Mozilla Firefox's IonMonkey JavaScript engine (Spidermonkey) that was used at Pwn2Own 2019. The exploit targets Windows platforms and leverages a JIT optimization bug to achieve out-of-bounds memory access, leading to arbitrary code execution in the renderer process. The main exploit logic is implemented in JavaScript (party.js), which manipulates array internals to gain arbitrary read/write primitives. It then loads a custom payload (payload.js) that embeds a reflective DLL (payload.dll) built from C++/assembly sources. The DLL, once injected into Firefox processes, hooks the JavaScript execution context to prepend arbitrary JavaScript (payload/injected-script.js) into all scripts executed by the browser. The demonstration payload changes the background image and redirects all links to a specific blog, but the mechanism allows for arbitrary JavaScript execution in other browser origins. The repository also includes a proof-of-concept (poc.js) for the vulnerability, build scripts, and utility code (toolbox.js) for memory manipulation. The exploit is operational and demonstrates full renderer compromise and cross-origin JavaScript injection on vulnerable Firefox versions on Windows.
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