In the previous post I demonstrated how to bypass Microsoft’s RFG, a.k.a. “Shadow Stack”, assuming we can locate the shadow stack. In this post I’ll fill up the missing details, and will describe how to find “Shadow” memory sections in a process’s virtual address space. While the technique works both in Windows and Linux, and it will demonstrate some key differences between the two operating systems.
After a long patching process, CVE 2016-8636 was now fixed and can be publicly disclosed. CVE 2016-8636 is caused by a classic integer-overflow vulnerability, showing that even the linux kernel suffers from this major vulnerability family.
As I promised in my previous post, here is an official public disclosure of CVE 2016-8633: linux kernel firewire driver remote code execution. The official fix was merged yesterday into the linux kernel, and so I can know talk freely about it.