Analysis on CVE-2017-3000

Introduction

In this post, I will introduce CVE-2017-3000, a CVE assigned to us last year. We analyse the weak implementation of the PRNG in Flash Player, which is used for constant blinding in its JIT compiler. We find two methods circumventing the constant blinding. Furthermore, we give a detailed exploitation plan on how to insert desired value into JIT code even if constant blinding is in place as demonstrated on the cover page. In this post, I will give details on the design of the PRNG and full exploit based on CVE-2015-5122.
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Analysis on CVE-2015-5119

Introduction

In this post, I will give a full COOP-like exploit based on CVE-2015-5119 as demonstrated on cover page. This post will contain two parts. The first part is about how to achieve arbitrary read/write primitive in 64-bit Flash. This part is based on [1][2] with some extra my own explanations. The second part is about how to achieve a COOP-like exploit with virtual function gadgets. I will discuss the dispatcher gadget, argument loading gadget and invoking gadget used in the exploit and pop up the calculator in the end. So I will skip the analysis of root cause of the vulnerability and focus on exploit development.
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