cve/2019/CVE-2019-9792.md

CVE-2019-9792

Description

The IonMonkey just-in-time (JIT) compiler can leak an internal JS_OPTIMIZED_OUT magic value to the running script during a bailout. This magic value can then be used by JavaScript to achieve memory corruption, which results in a potentially exploitable crash. This vulnerability affects Thunderbird < 60.6, Firefox ESR < 60.6, and Firefox < 66.

POC

Reference

• http://packetstormsecurity.com/files/153106/Spidermonkey-IonMonkey-JS_OPTIMIZED_OUT-Value-Leak.html
• https://bugzilla.mozilla.org/show_bug.cgi?id=1532599

Github

• https://github.com/RUB-SysSec/JIT-Picker
• https://github.com/googleprojectzero/fuzzilli
• https://github.com/zhangjiahui-buaa/MasterThesis