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@ -18,7 +18,7 @@ categories: Pwn二进制漏洞
- Metasploit框架-[下载](https://www.metasploit.com/)
- 靶机–Windows XP sp3
![](https://res.cloudinary.com/dozyfkbg3/image/upload/v1562741903/%E6%8D%95%E8%8E%B7.png)
![](https://res.cloudinary.com/dozyfkbg3/image/upload/v1562741903/pwn/%E6%8D%95%E8%8E%B7.png)
- 函数调用与栈：调用、返回
- 寄存器与函数栈帧：ESP、EBP
- 函数栈帧：局部变量、栈帧状态值、函数返回地址
@ -46,7 +46,7 @@ voidfunc(int a, int b, int c)
* pop ebp
* RETN【弹出返回地址，跳转】
3. 栈帧结构
![](https://res.cloudinary.com/dozyfkbg3/image/upload/v1562742079/%E6%8D%95%E8%8E%B71.png)
![](https://res.cloudinary.com/dozyfkbg3/image/upload/v1562742079/pwn/%E6%8D%95%E8%8E%B71.png)
# 0x01 简单栈溢出
@ -63,7 +63,7 @@ voidfunc(int a, int b, int c)
> `quit`
## 漏洞点
![](https://res.cloudinary.com/dozyfkbg3/image/upload/v1562742316/%E5%9B%BE%E7%89%871.png)
![](https://res.cloudinary.com/dozyfkbg3/image/upload/v1562742316/pwn/%E5%9B%BE%E7%89%871.png)
**产生崩溃**
将输出的1024个A发送给靶机程序
@ -71,44 +71,44 @@ voidfunc(int a, int b, int c)
python -c "print('A' * 1024)"
telnet 192.168.64.138 4242
```
![](https://res.cloudinary.com/dozyfkbg3/image/upload/v1562742366/%E5%9B%BE%E7%89%872.png)
![](https://res.cloudinary.com/dozyfkbg3/image/upload/v1562742366/pwn/%E5%9B%BE%E7%89%872.png)
## 关闭防御措施
使用**PESecurity**检查可执行文件本身的防御措施开启情况
注意设置：Set-ExecutionPolicyUnrestricted
![](https://res.cloudinary.com/dozyfkbg3/image/upload/v1562742444/%E5%9B%BE%E7%89%873.png)
![](https://res.cloudinary.com/dozyfkbg3/image/upload/v1562742444/pwn/%E5%9B%BE%E7%89%873.png)
**ASLR和DEP**
ASLR在xp下不用考虑，DEP可通过修改boot.ini中的nonexecute来完成（AlwaysOff、OptOut）
![](https://res.cloudinary.com/dozyfkbg3/image/upload/v1562742486/%E5%9B%BE%E7%89%874.png)
![](https://res.cloudinary.com/dozyfkbg3/image/upload/v1562742486/pwn/%E5%9B%BE%E7%89%874.png)
## 整体的攻击流程
1. 任意非00的指令覆盖buffer和EBP
2. 从程序已经加载的dll中获取他们的jmp esp指令地址。
3. 使用jmp esp的指令地址覆盖ReturnAddress
4. 从下一行开始填充Shellcode
![](https://res.cloudinary.com/dozyfkbg3/image/upload/v1562742543/%E5%9B%BE%E7%89%875.png)
![](https://res.cloudinary.com/dozyfkbg3/image/upload/v1562742543/pwn/%E5%9B%BE%E7%89%875.png)
## 确定溢出点的位置
1. 生成字符序列 **pattern_create.rb**
![](https://res.cloudinary.com/dozyfkbg3/image/upload/v1562742622/%E5%9B%BE%E7%89%876.png)
![](https://res.cloudinary.com/dozyfkbg3/image/upload/v1562742622/pwn/%E5%9B%BE%E7%89%876.png)
2. 发送给目标程序
![](https://res.cloudinary.com/dozyfkbg3/image/upload/v1562742623/%E5%9B%BE%E7%89%877.png)
![](https://res.cloudinary.com/dozyfkbg3/image/upload/v1562742623/pwn/%E5%9B%BE%E7%89%877.png)
3. 计算偏移量 **pattern_offset.rb**
![](https://res.cloudinary.com/dozyfkbg3/image/upload/v1562742685/%E5%9B%BE%E7%89%878.png)
![](https://res.cloudinary.com/dozyfkbg3/image/upload/v1562742685/pwn/%E5%9B%BE%E7%89%878.png)
4. 确定payload结构
![](https://res.cloudinary.com/dozyfkbg3/image/upload/v1562742686/%E5%9B%BE%E7%89%879.png)
![](https://res.cloudinary.com/dozyfkbg3/image/upload/v1562742686/pwn/%E5%9B%BE%E7%89%879.png)
## 寻找jmp esp跳板
1. OD附加进程看一下服务器加载了哪些模块
![](https://res.cloudinary.com/dozyfkbg3/image/upload/v1562742794/%E5%9B%BE%E7%89%8710.png)
![](https://res.cloudinary.com/dozyfkbg3/image/upload/v1562742794/pwn/%E5%9B%BE%E7%89%8710.png)
2. 查找JMP ESP指令的地址
在这里选择了ws2_32.dll作为对象，通过Metasploit的msfbinscan进行搜索
![](https://res.cloudinary.com/dozyfkbg3/image/upload/v1562742793/%E5%9B%BE%E7%89%8711.png)
![](https://res.cloudinary.com/dozyfkbg3/image/upload/v1562742793/pwn/%E5%9B%BE%E7%89%8711.png)
## 自动化攻击
```ruby=
@ -226,7 +226,7 @@ vim -bz.txt
- 将Easy File Sharing Web Server 7.2加载到ImmunityDebugger中，并处于运行状态。
- 发送溢出字符序列
- 查看Easy File Sharing Web Server 7.2溢出地址
![](https://res.cloudinary.com/dozyfkbg3/image/upload/v1562744240/231.png)
![](https://res.cloudinary.com/dozyfkbg3/image/upload/v1562744240/pwn/231.png)
3. 计算偏移量
计算catch块偏移量&计算下一条SEH记录偏移量
@ -325,7 +325,7 @@ Server username: WHU-3E3EECEBFD1\Administrator
> **漏洞点** ![](https://res.cloudinary.com/dozyfkbg3/image/upload/v1562744461/%E5%9B%BE%E7%89%8712.png)
## 设置DEP保护
![](https://res.cloudinary.com/dozyfkbg3/image/upload/v1562744518/%E6%8D%9511%E8%8E%B7.png)
![](https://res.cloudinary.com/dozyfkbg3/image/upload/v1562744518/pwn/%E6%8D%9511%E8%8E%B7.png)
*构建ROP链来调用VirtualProtect()关闭DEP并执行Shellcode*
## 计算偏移量