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CVE-2022-28281 is an out-of-bounds write vulnerability in Mozilla Thunderbird, Firefox, and Firefox ESR. The flaw occurs when a compromised content process sends an unexpected number of WebAuthN Extensions in a Register command to the parent process. This leads to memory corruption and can result in a potentially exploitable crash. The vulnerability is present in Thunderbird versions prior to 91.8, Firefox versions prior to 99, and Firefox ESR versions prior to 91.8.
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1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos.
This repository provides a proof-of-concept exploit for CVE-2022-28281, a memory corruption vulnerability in Mozilla Firefox for Windows. The exploit consists of a crafted HTML file (src/trigger.html) that abuses the WebAuthN API by sending an unexpected number of extensions in a registration request. When a vulnerable Firefox build (prior to version 99) visits this page, it triggers an out-of-bounds write in the parent process, leading to a crash. The README.md contains a detailed root-cause analysis, instructions for patching and building Firefox to facilitate exploitation, and step-by-step reproduction guidance. The exploit is not weaponized and does not provide post-exploitation capabilities; it is intended to demonstrate the vulnerability and cause a crash for research and verification purposes. The only network endpoint involved is the local HTTP server used to serve the trigger.html file.
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