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zsy-arch.github.io's Introduction

  • 👋 Hi, I’m @zsy-arch
  • 👀 I’m interested in Security / Binary Security / CTF .
  • 🌱 I’m currently learning Reverse Engineering / Crypto / Datastructure & Algorithm .
  • 💞️ I’m looking to collaborate on CTF.

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zsy-arch.github.io's Issues

Windows kernel exploit - HEVD Stack Overflow | zsy的小屋 -> D0 wh4t u w4n7 t0 d0 <-

https://zsy-arch.github.io/2022/10/03/Windows-kernel-exploit-HEVD-Stack-Overflow/

HEVD 环境搭建安装Visual Studio 2022、cmake、git cli,然后从https://github.com/hacksysteam/HackSysExtremeVulnerableDriver 下载源码,然后用内置的bat脚本编译即可。 栈溢出定位HEVD直接把漏洞点写在了函数名上,用IDA打开HEVD.sys文件,会直接定位到DriverEntry,用于打印调试信息和初始

Writeup - ASIS CTF 2022 Quals reverse [partial] | zsy的小屋 -> D0 wh4t u w4n7 t0 d0 <-

https://zsy-arch.github.io/2022/10/20/Writeup-ASIS-CTF-2022-Quals-reverse-partial/?

traditionalanalysis附件是一个无壳elf64和一个flag.enc文件,猜测是要对flag.enc文件进行解密。 main函数有一个call cs:off_564C6050EB00,猜测是rust、nim之类的语言,通过搜索字符串发现有.rs可以判断是rust的程序。 直接进入到sub_564C604BFA40分析,发现这个函数汇编层面比较复杂,F5也不是很清晰。 在L

Windows驱动开发 用户层与内核层通信 | zsy的小屋 -> D0 wh4t u w4n7 t0 d0 <-

https://zsy-arch.github.io/2022/02/01/Windows%E9%A9%B1%E5%8A%A8%E5%BC%80%E5%8F%91-%E7%94%A8%E6%88%B7%E5%B1%82%E4%B8%8E%E5%86%85%E6%A0%B8%E5%B1%82%E9%80%9A%E4%BF%A1/

内核层用户层与内核层通信可以使用IoCreateDeviceSecure函数创建的设备(Device)作为中间媒介IoCreateDeviceSecure在成功情况下会通过参数返回一个DeviceObject,此时的设备还不能直接被用户层程序使用,需要为其创建一个符号链接(Symbolic Link). 创建好符号链接后可以被用户层程序使用.设备本身有自己的名字,比如\Device\mydev

ACTF2022 复现 2 | zsy的小屋 -> D0 wh4t u w4n7 t0 d0 <-

https://zsy-arch.github.io/2022/07/20/ACTF2022-%E5%A4%8D%E7%8E%B0-2/

kcov附件 launch.sh bzImage rootfs.cpio.gz 分析附件里的 bzImage 和 rootfs.cpio.gz 很明显是个 Linux 内核文件和Linux文件系统. 看了一下 launch.sh 的文件内容就是一个 QEMU 的启动脚本, 直接运行试试. 发现运行后可以看到kcov程序运行, 但是输出了个文件无法打开的错误就退出了, 这种情况就直接从 rootf

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