Linux Kernel Exploitation: Setting Up Debugging Environment


These days I think there is still necessity to write a tutorial series on Linux Kernel exploitation and hope to summarize the kernel exploitation techniques as following:
(1) Kernel Debugging
(2) Return-oriented-Programming in Kernel
(3) Kernel Mitigation: KASLR, SMEP, SMAP
(4) Kernel Space Memory Allocator: SLAB Allocator
In this post, I will introduce how to debug a Linux Kernel via CVE-2017-7308 [1], including setting up debugging environment, root cause analysis and exploit primitive analysis.
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Virtual Function


The virtual table is the key factor that achieves polymorphism in C++. This post will talk about the virtual table and its structure in C++. More particularly, I will introduce the virtual functions under Linux and Windows. All tests are done on 64-bit platform. 32-bit platform is a little bit different but the basic idea is similar.
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Extra Heap Exploitation: House-of-Rabbit


In recent HITB XCTF, this technique is used in one heap challenge. I think it’s necessary to give a basic introduction on this also as an extension on my tutorial on largebin in ptmalloc.
The criteria for this exploitation technique is strict compared to other techniques and requires a lot of manual craft to assure the exploit is successful. The advantage of this technique is that the whole exploitation no longer depends on the knowledge of the base address of libc. But the advantage is limited as we still need a known address in advance, which can by repeatedly and reliably modified. Maybe the CTF community may find more potential of such technique in future.
The original information about this technique can be found in [1]. My post is based on this blog.
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