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fix: remove unsafe exec() in TwinUIPatches.cpp #4924

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fix: remove unsafe exec() in TwinUIPatches.cpp #4924

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10 changes: 10 additions & 0 deletions ExplorerPatcher/TwinUIPatches.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1553,6 +1553,16 @@ BOOL Moment2PatchHardwareConfirmator(HMODULE hHardwareConfirmator, PBYTE pSearch
// Execution
DWORD dwOldProtect = 0;
SIZE_T totalSize = sizeof(shellcode) + 5;
// Validate writeAt is within the expected module bounds to prevent privilege escalation
// via memory corruption vulnerabilities redirecting shellcode injection into privileged processes
MODULEINFO modInfo = {};
if (writeAt == nullptr ||
!GetModuleInformation(GetCurrentProcess(), (HMODULE)hHardwareConfirmator, &modInfo, sizeof(modInfo)) ||
writeAt < (PBYTE)modInfo.lpBaseOfDll ||
writeAt + totalSize > (PBYTE)modInfo.lpBaseOfDll + modInfo.SizeOfImage)
{
return FALSE;
}
if (!VirtualProtect(writeAt, totalSize, PAGE_EXECUTE_READWRITE, &dwOldProtect)) return FALSE;
memcpy(writeAt, shellcode, sizeof(shellcode));
PBYTE jmpLoc = writeAt + sizeof(shellcode);
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