writeRandomBytes_RtlGenRandom(void * target, size_t count) {
  int success = 0;  /* full count bytes written? */
  const HMODULE advapi32 = _Expat_LoadLibrary(TEXT("ADVAPI32.DLL"));

  if (advapi32) {
    const RTLGENRANDOM_FUNC RtlGenRandom
        = (RTLGENRANDOM_FUNC)GetProcAddress(advapi32, "SystemFunction036");
    if (RtlGenRandom) {
      if (RtlGenRandom((PVOID)target, (ULONG)count) == TRUE) {
        success = 1;
      }
    }
    FreeLibrary(advapi32);
  }

  return success;
}

The product processes an XML document that can contain XML entities with URIs that resolve to documents outside of the intended sphere of control, causing the product to embed incorrect documents into its output.